Data Highway/Data Highway Plus/ Data Highway II/Data Highway 485 Cable Installation Manual
Important User Information Because of the variety of uses for this product and because of the differences between solid state products and electromechanical products, those responsible for applying and using this product must satisfy themselves as to the acceptability of each application and use of this product. For more information, refer to publication SGI-1.1 (Safety Guidelines For The Application, Installation and Maintenance of Solid State Control).
Summary of Changes Data Highway/Data Highway Plus/ Data Highway II/Data Highway 485 Cable Summary of Changes Summary of Changes This release of the publication contains new information for categorizing and routing cables.
Table of Contents Summary of Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . P 1 Summary of Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Revision Bars . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P 1 P 1 Using this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i Who Should Read this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . How this Manual Is Organized . . . . . . . . . . . . . . . . .
ii Table of Contents Data Highway II Overview . . . . . . . . . . . . . . . . . . . . . . . . . 4 1 Chapter Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . The DH II Cable System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . How Nodes Communicate on DH II . . . . . . . . . . . . . . . . . . . . . . . Communication Between Networks . . . . . . . . . . . . . . . . . . . . . . . Communication with Synchronous and Asynchronous Devices . . .
Table of Contents iii Constructing RS 232 C and Longline Cables . . . . . . . . . . . A 1 Chapter Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RS 232 C Connections (Less than 50 Cable Feet) . . . . . . . . . . . . Longline Connections (up to 7,000 Cable Feet) . . . . . . . . . . . . . . .
Preface Using this Manual Using this Manual Who Should Read this Manual Read this manual if you are planning and/or installing a Data Highway (DH), Data Highway Plus (DH+), Data Highway II (DH II), or Data Highway-485 (DH-485) cable network. We assume that you have a fundamental understanding of electronics and electrical codes. How this Manual Is Organized This manual explains how to plan and install a DH, DH+, DH II, and DH-485 cable system.
Preface Using this Manual Frequently Used Terms Precautionary Notes We use the following terms and abbreviations in this manual: When you see this term: It means: Computer The generic term for any intelligent programmable device that can be used with specific interface modules. DH Data Highway DH+ Data Highway Plus DH II Data Highway II DH 485 Data Highway 485 Dropline Cable that connects a node to a network via a station connector.
Preface Using this Manual Related Products and Publications For more information about related Allen-Bradley products, refer to the following chart.
Preface Using this Manual For more information about related Allen-Bradley publications, refer to the following chart. iv Publication: Publication Number: Data Highway/Data Highway Plus Asynchronous Interface Module User's Manual 1770 6.5.13 Data Highway Communication Controller Interface Module User's Manual 1771 6.5.15 Communication Adapter Module User's Manual 1771 6.5.1 Data Highway on Broadband Interface Module 1771 6.5.59 PLC 3 Communication Adapter Module User's Manual 1775 6.5.
Chapter 1 Data Highway and Data Highway Plus Overview Chapter Overview In this chapter we provide you with an overview of the Data Highway and Data Highway Plus cable systems. We describe: the DH and DH+ cable systems how nodes communicate on DH how nodes communicate on DH+ communication between networks The DH and DH+ Cable Systems The Allen-Bradley DH and DH+ systems are Local Area Networks (LANs).
Chapter 1 DH and DH+ Overview Devices Used on DH Figure 1.1 shows devices that can be used on a DH network. Important: The following illustration is intended only to depict the various devices that can be used on a Data Highway network. You should not interpret this illustration to be a representation of how to configure your DH network. Figure 1.1 Devices that can be used on a DH network.
Chapter 1 DH and DH+ Overview Unlike a master/slave relationship, a floating master relationship does not require the current master to poll each node to grant permission to transmit information. This results in less overhead per transaction and a more efficient network. On DH, the interface modules control access to the network locally. This means if one module faults, the other modules continue to communicate on the network.
Chapter 1 DH and DH+ Overview DH+ Overview This section provides an overview of the DH+ cable system. In this section we talk about: devices used on DH+ how nodes communicate on DH+ Devices Used on DH+ Figure 1.2 shows the devices that can be used on a DH+ network. Important: Figure 1.2 is intended only to depict the various devices that can be used on a Data Highway Plus network. You should not interpret this illustration to be a representation of how to configure your DH+ network. Figure 1.
Chapter 1 DH and DH+ Overview How Nodes Communicate on DH+ DH+ uses token-passing protocol to allow nodes on the network to transmit messages over the cable. With token-passing protocol, only the node possessing the token can transmit messages. As long as a node possesses the token, it is the master. This is rotation of link mastership. When a node has sent all of its messages or used all of its token-hold time, it passes the token to the node with the next highest address.
Chapter 1 DH and DH+ Overview To connect these devices to a DH+ interface module, you must provide your own cable. The interface module and cable you use depends upon the type of device you are connecting. In this chapter we provided you with a general overview of the DH and DH+ cable systems. You are now ready to plan your network. Refer to Chapter 2. Important: Chapter 2 provides important specifications, guidelines and precautions that you need to know before you construct your DH or DH+ network.
Chapter 2 Planning a Data Highway or Data Highway Plus Cable System Chapter Overview The Data Highway and Data Highway Plus cable systems give you flexibility to design a communication network that is tailored to your particular needs. To take full advantage of this flexibility, you should spend sufficient time planning how to install your cable system before assembling any of the hardware.
Chapter 2 Planning a Data Highway or Data Highway Plus Cable System Components of a Network Constructed with Station Connectors and Droplines If you have a DH network, you must construct it using station connectors and droplines. If you have a DH+ network, you may use station connectors and droplines, or daisy chaining to connect the devices on your network.
Chapter 2 Planning a Data Highway or Data Highway Plus Cable System Trunkline The trunkline is the bus, or the central part of the network cable system. The length of the trunkline depends upon the location of the nodes in your network, however, the maximum length for the trunkline is 10,000 feet (3050 meters). The trunkline is constructed of Belden 9463 twinaxial cable (Figure 2.2). This cable consists of a twisted pair of conductors wrapped in two layers of shielding and a drain wire. Figure 2.
Chapter 2 Planning a Data Highway or Data Highway Plus Cable System Station Connectors Station connectors connect droplines to the trunkline and also link trunkline segments together. Important: A DH or DH+ network can have no more than 64 nodes. Each station connector on the trunkline counts as one of those nodes, even if no dropline or device is connected to that station connector.
Chapter 2 Planning a Data Highway or Data Highway Plus Cable System The following sections describe the two types of station connectors in more detail. 1770-SC Station Connector The 1770-SC station connector can be used on either a DH or DH+ network and can be used instead of the 1770-XG connector kit (described later in this chapter). You need one 1770-SC station connector for each node you want to connect to the network.
Chapter 2 Planning a Data Highway or Data Highway Plus Cable System 1770-XG Connector Kit The 1770-XG connector kit can be used on a DH or DH+ network, and can be used instead of a 1770-SC station connector (explained earlier in this chapter). You need one 1770-XG connector kit for each node you want to connect to the network.
Chapter 2 Planning a Data Highway or Data Highway Plus Cable System Figure 2.3 shows the components included in a 1770-XG connector kit. Figure 2.3 The components of a 1770 XG connector kit.
Chapter 2 Planning a Data Highway or Data Highway Plus Cable System Table 2.A lists the part numbers and manufacturers for the components in the 1770-XG connector kit. Table 2.A Manufacturers and part numbers for the 1770 XG connector kit.
Chapter 2 Planning a Data Highway or Data Highway Plus Cable System Figure 2.4 shows how a network can be constructed using the components of a 1770-XG connector kit. Figure 2.4 A network constructed using the components of a 1770 XG connector kit.
Chapter 2 Planning a Data Highway or Data Highway Plus Cable System Figure 2.5 shows a more detailed view of the T-connector, plug connectors, jack connector and the 15-socket connector, and how they connect the network together. Important: You must assemble the T-connector only as shown. Figure 2.5 Network connections with a 1770 XG connector kit.
Chapter 2 Planning a Data Highway or Data Highway Plus Cable System Terminators Figure 2.6 shows the terminators that must be installed in your DH or DH+ cable system if you use the 1770-XG connector kit. These terminators are included in the 1770-XG connector kit. You must install two terminators (one plug terminator and one jack terminator) for a complete DH or DH+ network. Figure 2.6 Two terminators must be installed for a complete DH or DH+ cable system.
Chapter 2 Planning a Data Highway or Data Highway Plus Cable System You need one 1770-XG connector kit for each node you want to link to the DH network. The 1770-XG connector kit may be used on a DH or DH+ network. For information on installing a 1770-XG connector kit, refer to Chapter 3. Daisy Chaining (DH+ only) If you prefer not to use station connectors and droplines on your DH+ network, you may interconnect nodes in a daisy chain fashion. For more information on daisy chaining, refer to Chapter 3.
Chapter 2 Planning a Data Highway or Data Highway Plus Cable System Important: Remember that the maximum cable length of the trunkline is 10,000 feet (3050 meters), and that dropline cables must be no more than 100 feet (30.5 meters) in length. If possible, keep the dropline cables longer than 10 feet (3.0 meters) in length. Selecting the shortest path for routing the cable will help minimize the amount of cable you will need.
Chapter 2 Planning a Data Highway or Data Highway Plus Cable System I/O Raceway Layout Considerations The I/O raceway layout of a system is reflective of where the different types of I/O modules are placed in an I/O chassis. Therefore, you should determine I/O module placement prior to any layout and routing of wires. However, when planning your I/O module placement, segregate the modules based upon the conductor categories published for each I/O module so that you can follow these guidelines.
Chapter 2 Planning a Data Highway or Data Highway Plus Cable System Group conductor cables fitting this description: Into this category: Examples: Intra enclosure - Interconnect the system components within an enclosure • corresponds to NEC article 725 classes 2 & 3 • corresponds to IEEE levels 1 (high susceptibility) & 2 (medium susceptibility) Category 3 • low voltage dc power cables - provide backplane power to the system components • communication cables - to connect between system components with
Chapter 2 Planning a Data Highway or Data Highway Plus Cable System Table 2.C Follow these guidelines for routing cables Route this category of conductor cables: According to these guidelines: Category 1 These conductors can be routed with machine power conductors of up to 600V ac (feeding up to 100 hp devices) if this does not violate local codes. Category 2 General guidelines - these guidelines apply in all cases. • If it must cross power feed lines, it should do so at right angles.
Chapter 3 Constructing a Data Highway or Data Highway Plus Cable System Chapter Overview Use this chapter to construct a DH and DH+ cable system.
Chapter 3 Constructing a Data Highway or Data Highway Plus Cable System Construct a Network Using 1770 Station Connectors and Droplines Here is a brief outline of the procedures you will follow as you construct your network using 1770-SC station connectors and droplines.
Chapter 3 Constructing a Data Highway or Data Highway Plus Cable System Refer to the following procedure for instructions on how to attach the various electrical connectors to a dropline. To attach an electrical connector to a dropline, follow these steps: 1. Cut the Belden 9463 twinaxial cable to the length desired for a dropline. Important: Remember, a dropline must be no more than 100 feet (30.5 meters) in length. If possible, keep the dropline cables longer than 10 feet (3.0 meters) in length.
Chapter 3 Constructing a Data Highway or Data Highway Plus Cable System If you have a 15-socket connector, continue with step 7. If you do not have a 15-socket connector, continue with step 9. 7. Remove the screws that attach the right-angle hood to the 15-socket connector and separate the hood from the connector.
Chapter 3 Constructing a Data Highway or Data Highway Plus Cable System 11. Connect the dropline to the 3-position terminal block connector. Secure this wire: To this terminal: Clear conductor wire 1 Drain wire SH Blue conductor wire 2 Terminals on 3 - pin terminal block 1 SH 2 Clear Shield Clear Twinaxial cable Blue 1 Shield SH Blue 2 19603 Go to step 15. 12. Connect the dropline to the 9-pin electrical connector.
Chapter 3 Constructing a Data Highway or Data Highway Plus Cable System 13. Attach the dropline to the 15-socket connector and secure each wire with a bead of solder. Important: In this step, take care so that you do not heat the shrink tubing when soldering.
Chapter 3 Constructing a Data Highway or Data Highway Plus Cable System 14. Attach the dropline to the 62-pin connector. Connect this wire: To this pin number: Blue conductor wire 34 Clear conductor wire 36 Drain wire 35 15. Slide all three pieces of the small-diameter shrink tubing over the solder points at the connector. Using a heat gun, heat the tubing until the pieces fit snugly on the conductor wires and the drain wire. 16.
Chapter 3 Constructing a Data Highway or Data Highway Plus Cable System Test the Connector for Electrical Shorts After you have soldered the connector to the dropline, you must check for electrical shorts.
Chapter 3 Constructing a Data Highway or Data Highway Plus Cable System Electrical Short Exists and Dropline Has Station Connector Disassemble the electrical connector and the station connector and try to locate and correct the short. Check the resistances. If the resistance readings: Then: Indicate there are no shorts Attach the dropline to the trunkline. Refer to the appropriate section later in this chapter. Indicate that a short exists The short is probably inside the dropline cable.
Chapter 3 Constructing a Data Highway or Data Highway Plus Cable System Figure 3.1 A cable network constructed with 1770 SC station connectors. Node Dropline Station Connector Station Connector Dropline Node Station Connector Dropline Node Station Connector Dropline Node Station Connector Dropline Node Trunkline Cable Distance, 10,000 ft. Max. 11275 The first step in constructing a network with 1770-SC station connectors is to connect the dropline to a station connector.
Chapter 3 Constructing a Data Highway or Data Highway Plus Cable System Connect the Dropline to the Station Connector Important: Remove the terminal block from inside the station connector before attaching the dropline and trunkline segments to the station connector. This makes it easier to connect the wires to the screw-clamp terminals. Important: Remember that dropline cables must be no more than 100 feet (30.5 meters) in length. If possible, keep the dropline cables longer than 10 feet (3.
Chapter 3 Constructing a Data Highway or Data Highway Plus Cable System Use Figure 3.3 for reference when performing steps 3 through 6. Figure 3.3 Connect the dropline to the station connector. Trunkline In Trunkline Out Cable Clamp Ground Wire (green) Dropline Cable To Data Highway or Data Highway Plus 3. #12 ga. to Earth Ground 11276 Guide the end of the dropline through the cable clamp on the station connector.
Chapter 3 Constructing a Data Highway or Data Highway Plus Cable System 4. 5. Using wire cutters, trim the drain wire to the following specifications. If the dropline cable is: Then: 10 100 feet ( 3.0 30.5 meters) in length Trim the dropline cable drain wire to 1.5 inches (3.8 cm) and secure it to terminal 7. Less than 10 feet (3.0 meters) in length Trim the dropline cable drain wire so it is even with the outer jacket. Make the following connections: Secure this wire: 6.
Chapter 3 Constructing a Data Highway or Data Highway Plus Cable System Attach these wires: 6. To this terminal number: Two blue conductor wires (one from each trunkline segment) 1 Two drain wires (one from each trunkline segment) 2 Two clear conductor wires (one from each trunkline segment) 3 Secure the trunkline segments by tightening the cable clamps around them.
Chapter 3 Constructing a Data Highway or Data Highway Plus Cable System Mount the Station Connector Now that all the necessary connections are made to the station connector, mount the station connector by following these steps. 1. Select a secure foundation for mounting the station connector. If necessary, drill and/or tap mounting holes according to the dimensions shown in Figure 3.4. Figure 3.4 If necessary, drill and/or tap mounting holes for the station connector. 12.1cm (4.75") Terminal Block 5.
Chapter 3 Constructing a Data Highway or Data Highway Plus Cable System Network Checkout After you have installed your network using 1770-SC station connectors, complete the following steps before you attach any modules to the droplines to check the system integrity. Important: If the trunkline is routed between several building structures, building-to-building ground potential may differ. This checkout should be done on a per building basis. 1. Check the resistance between the following points.
Chapter 3 Constructing a Data Highway or Data Highway Plus Cable System Construct a Network Using 1770 XG Connector Kits and Droplines Here is a brief outline of the procedures you will follow as you construct your network using 1770-XG connector kits and droplines.
Chapter 3 Constructing a Data Highway or Data Highway Plus Cable System Figure 3.5 The internal components of a jack connector and a plug connector. Twinaxial Cable Wrench Crimp Nut Cone Cone Dielectric Insulating Washer Notched Insert Pin Pin Dielectric Shield Shield Dielectric Plug Connector Body Jack Connector Body 10804 Since the components are so similar, the procedure for soldering a jack connector or a plug connector to a cable segment is the same for either connector.
Chapter 3 Constructing a Data Highway or Data Highway Plus Cable System Important: When using a 1770-XG connector kit, droplines will have an electrical connector attached to one end of the dropline and a plug connector soldered to the other end. Trunkline segments will have a plug connector soldered to one end of the cable segment and a jack connector soldered to the other end.
Chapter 3 Constructing a Data Highway or Data Highway Plus Cable System c. Insert the small end of the cone dielectric into the large end of the cone. Press both parts together firmly until the rim of the cone dielectric seats evenly against the large end of the cone. Cone Dielectric Cone 18735 d. Fold back the braided shield and unwrap the foil shield to expose the filler cord and conductor wires.
Chapter 3 Constructing a Data Highway or Data Highway Plus Cable System g. Push the cone assembly onto the conductor wires until the foil shield and the braided shield are slightly crimped between the cone assembly and the outer jacket. Important: In the next step, do not cut the drain wire. h. Using wire cutters, carefully cut the foil shield and the braided shield until they are just short of covering the entire tapered portion of the cone.
Chapter 3 Constructing a Data Highway or Data Highway Plus Cable System 2. Prepare the cable for soldering. ATTENTION: In the next step, do not over-tighten the vise. Over-tightening the vise may destroy the outer jacket and the shielding of the cable segment. a. Secure the cable segment in a vise so that the cable end you want to solder is parallel to the ground. b. Wrap the drain wire around the tapered portion of the cone in a spiral fashion.
Chapter 3 Constructing a Data Highway or Data Highway Plus Cable System d. Cut the blue conductor wire and the clear conductor wire to approximately 0.35 inch (8.9 mm), as measured from the outside surface of the insulating washer. 8.89mm (0.35") Cone Assembly Conductor Wires Insulating Washer 18741 e. Using wire strippers, strip approximately 0.10 inch (2.5 mm) of insulation off the end of the blue conductor wire. f. Using wire strippers, strip approximately 0.20 inch (5.
Chapter 3 Constructing a Data Highway or Data Highway Plus Cable System b. Tin the end of the blue conductor wire with a light coating of solder. ATTENTION: To avoid burning yourself, allow the wire and solder to cool to room temperature before proceeding to the next step. c. Push the notched insert onto the blue conductor wire so that the insert is flush against the insulating washer. The clear conductor wire fits into the notch in the end of the insert. d.
Chapter 3 Constructing a Data Highway or Data Highway Plus Cable System g. Slide the pin dielectric over the pin assembly. Blue Conductor Wire Pin Dielectric Hole in Large End of Pin 18731 h. Slide the shield over the pin assembly and seat the shield against the insulating washer. Make sure the clear conductor wire extends through the notch in the large end of the shield. i. Wrap the clear conductor wire around the groove in the shield. j.
Chapter 3 Constructing a Data Highway or Data Highway Plus Cable System 4. Install the jack or plug connector. a. Slip the shield dielectric over the shield assembly. Shield Shield Dielectric 18738 b. Push the connector body over the shield dielectric and engage the threads of the wrench crimp nut. ATTENTION: In the next step, be sure to adhere to the torque specification.
Chapter 3 Constructing a Data Highway or Data Highway Plus Cable System Test the Connector for Electrical Continuity After you have assembled the connector body, check for any electrical shorts that exist in the connector.
Chapter 3 Constructing a Data Highway or Data Highway Plus Cable System If the readings you obtain indicate that no shorts exist, you are ready to connect the cable segments as explained next in this chapter. If the readings you obtain indicate a short exists, disassemble the electrical connector and the station connector and try to locate and correct the short. Check for frayed wire or wire fragments at each end of the wire. Check the resistances again.
Chapter 3 Constructing a Data Highway or Data Highway Plus Cable System Connect the Cable Segments Once you have soldered the connectors to the dropline and trunkline segments, you must link these cable segments together. To do this, use the T-connector from the connector kit. Use Figure 3.6 for reference when connecting the cable segments. Figure 3.6 Connect the trunkline and droplines.
Chapter 3 Constructing a Data Highway or Data Highway Plus Cable System Figure 3.7 shows a more detailed view of the attachments to the T-connector. Figure 3.7 Attachments to the T connector. Jack Leg Jack Leg Plug Connector Plug Leg Plug Connector Jack Connector Trunkline Segment 11618 1. Attach the jack connector of one trunkline segment to the plug leg of the T-connector. 2. Attach the plug connector of the other trunkline segment to one of the jack legs of the T-connector. 3.
Chapter 3 Constructing a Data Highway or Data Highway Plus Cable System Figure 3.8 Install terminators to the first and last nodes. Plug Terminator Jack Terminator 11608 Use Figure 3.9 for reference when installing the trunkline terminators. Figure 3.9 Terminate the trunkline. Trunkline Segment Plug Terminator Dropline Dropline Jack Connector Trunkline Segment 11621 1. Attach the plug terminator to the T-connector jack leg that does not have a trunkline segment connected to it. 2.
Chapter 3 Constructing a Data Highway or Data Highway Plus Cable System Construct a Network Using a If you choose, you may construct your DH+ network using a daisy chain Daisy Chain Configuration configuration, as shown below. (DH+ Only) Node Node Node Node 18768 To make daisy chain DH+ connections, connect the twinaxial cable to the corresponding DH+ connector terminals on the terminal block of both devices (Figure 3.10). Figure 3.10 Terminal connections when nodes are daisy chained.
Chapter 3 Constructing a Data Highway or Data Highway Plus Cable System Reconfigure a Network Constructed with Droplines and Station Connectors (If Necessary) After your DH or DH+ network has been operating for some time, you may find it necessary to add or remove nodes from the network. This section explains how to modify a network constructed with droplines and station connectors to accommodate these changes.
Chapter 3 Constructing a Data Highway or Data Highway Plus Cable System Remove a Node from DH and DH+ The procedure for removing a node from a DH and DH+ network depends upon whether you want to remove the node permanently or temporarily. In either case, you do not need to remove power from an Allen-Bradley programmable controller before disconnecting its node from the network. The programmable controller continues to control its outputs in a normal fashion even after it is disconnected from the network.
Chapter 3 Constructing a Data Highway or Data Highway Plus Cable System 4. Insert a cable clamp plug into the cable clamp where the dropline used to be. Secure the cable clamp plug by tightening the cable clamp. Trunkline In Trunkline Out Cable Clamp Ground Wire (green) Dropline Cable To Data Highway or Data Highway Plus #12 ga.
Chapter 3 Constructing a Data Highway or Data Highway Plus Cable System Permanently Remove an Intermediate Node from a Network Constructed with a 1770-XG Connector Kit Important: An intermediate node is a node that is not the first or last node on the trunkline. To permanently remove an intermediate node from a network constructed with a 1770-XG connector kit, follow these steps: 1. Disconnect both trunkline segments from the T-connector that links the node you want to remove.
Chapter 3 Constructing a Data Highway or Data Highway Plus Cable System 2. Connect the mating ends of the two trunkline segments you disconnected from the T-connector. Reconnect Trunkline Segments here T - Connector Trunkline Segment Dropline of disconnected Node Remove Trunkline Segment 11620 3. If possible, remove the T-connector and dropline from the site and store them for future use.
Chapter 3 Constructing a Data Highway or Data Highway Plus Cable System 2. Disconnect the jack terminator or plug terminator from the T-connector.
Chapter 3 Constructing a Data Highway or Data Highway Plus Cable System 3. Plug the terminator into the end of the trunkline segment that you disconnected from the T-connector. T - Connector Dropline of discarded node Trunkline Segment Jack Terminatortor Plug Connectorr Reconnect Terminator here You may also remove unneeded Trunkline Segment 11622 4. If possible, remove the T-connector and dropline from the site and store them for future use.
Chapter 4 Data Highway II Overview Chapter Overview Read this chapter for information on: the DH II cable system how nodes communicate on DH II communication between networks communication with synchronous and asynchronous devices related products and publications The DH II Cable System The Allen-Bradley Data Highway II system is a Local Area Network (LAN). It connects programmable controllers, computers, and other devices so they can communicate and exchange data with one another.
Chapter 4 DH II Overview Figure 4.1 shows an example of a DH II network. Figure 4.1 A typical DH II cable system. PLC - 2 1779-KP2/KP2R* PLC - 3 1779-KP3/KP3R* Data Highway II 1779-KFL/KFLR* 1779-KP5/KP5R* 1779-KMF/KMFR* Computer Robot * An "R" in the product name denotes a redundant module. IBM-PC To Data Highway Plus 18770 You can also order your DH II interface modules with a redundant-cabling option.
Chapter 4 DH II Overview Figure 4.2 shows a typical redundant cabling configuration. Figure 4.2 A redundant cabling configuration.
Chapter 4 DH II Overview How Nodes Communicate on DH II DH II uses token-passing protocol to allow nodes on the network to transmit messages over the cables. With token-passing protocol, only the node possessing the token can transmit messages. As long as a node possesses the token, it is the master. When a node has sent all of its messages or used all of its token-hold time, it passes the token to the node with the next highest address.
Chapter 4 DH II Overview To connect these devices to a DH II interface module, you must provide your own cable. The interface module and cable you use depends upon the type of device you are connecting. For example, an asynchronous device that communicates through an RS-232-C port would use RS-232-C cable to connect to a DH II Asynchronous Device Interface (1779-KFL, -KFLR). Refer to Appendix A for wiring diagrams for several devices.
Chapter 5 Planning a Data Highway II Cable System Chapter Overview This DH II cable system gives you flexibility to design a communication network that is tailored to your particular needs. To take full advantage of this flexibility, you should spend sufficient time planning how to install your cable system before assembling any of your hardware. Important: This chapter provides important specifications, guidelines and precautions that you need to know before you construct your DH II network.
Chapter 5 Planning a DH II Cable System Use Figure 5.1 for reference when reading about these components. Important: The following illustration is intended only as a general example of a Data Highway II network. You should not interpret this illustration to be a representation of how to configure your DH II network. Figure 5.1 Components of a Data Highway II network.
Chapter 5 Planning a DH II Cable System Trunkline The trunkline is the bus, or the central part of the network cable system. The length of the trunkline on your network depends upon the number of nodes you require, however, the maximum length is 8,000 feet (2440 meters). Each node on the trunkline reduces the 8,000 feet (2440 meters) of available trunkline length by 75 feet (22.9 meters).
Chapter 5 Planning a DH II Cable System You must order RG-11 type coaxial cable through the following manufacturers. Table 5.A Manufacturers and part numbers for RG 11 type coaxial cable. Manufacturer: Part Number: Allen Bradley 94082901 Carol/Astro C0996 / 20 111 E Alpha 9825C Times AA 5066 For extremely harsh environments, order cable with a HALAR* jacket through the following manufacturers.
Chapter 5 Planning a DH II Cable System Droplines and Taps Droplines connect individual nodes to the trunkline. They are two feet long and connect directly to the node interface module. The catalog number is 1779-XP. Important: The droplines on your DH II network must be 2 feet (61 cm) in length. Taps connect the droplines to the trunkline and are supplied with the droplines. A trunkline segment must be at least 30 feet (9.2 meters) long between taps.
Chapter 5 Planning a DH II Cable System Each node on a DH II network requires a tap. Each tap contains the following components: a tap box with two trunkline jacks and a dropline jack a cap for covering the dropline jack when there is no dropline attached a 2-foot (61.0 cm) dropline cable that connects an interface module to the dropline jack on the tap two cable plugs that connect the trunkline cables to the trunkline jacks on the tap You can purchase additional cable plugs (part no.
Chapter 5 Planning a DH II Cable System You can order terminators from the following manufacturer: Trompeter Electronics, Inc. 31186 Labaya Drive Westlake, Village, CA 91311 The part numbers for the terminators are: Component: Manufacturer Part Number: Plug connector TNG1 1 150 Jack connector TNGBJ1 1 150 For information on installing terminators, refer to Chapter 6. Necessary Tools To install a DH II cable system you will need a stripping and a crimping tool for RG-11 cable.
Chapter 5 Planning a DH II Cable System Guidelines for Determining Cable Length The trunkline on your network is divided into several segments by taps. The cable length of the trunkline is equal to the total cable length of the trunkline segments. Important: When determining the cable length of trunkline segments, be sure to measure the actual cable path as it is routed in your network. Be sure to consider vertical dimensions as well as horizontal dimensions.
Chapter 5 Planning a DH II Cable System ATTENTION: Do not bend the trunkline cable so that it has a bend-radius of less than 6 inches (15.2 cm). Bending the cable more than the recommended bend-radius may decrease the reliability of the network. You should plan your dropline cable routing so that the bend-radius for the dropline cable is not less than 3 inches (7.6 cm). Figure 5.6 The bend radius for the dropline cable should not be less than 3 inches (7.6 cm).
Chapter 5 Planning a DH II Cable System Selecting the Number of Taps You must install a tap for each node on the network. I/O Raceway Layout Considerations The I/O raceway layout of a system is reflective of where the different types of I/O modules are placed in an I/O chassis. Therefore, you should determine I/O module placement prior to any layout and routing of wires.
Chapter 5 Planning a DH II Cable System Table 5.C Follow these guidelines for grouping conductors Group conductor cables fitting this description: Into this category: Examples: Control & ac Power - high power conductors that are more tolerant of electrical noise than category 2 conductors and may also cause more noise to be picked up by adjacent conductors.
Chapter 5 Planning a DH II Cable System Route Conductors To guard against coupling noise from one conductor to another, follow the general guidelines shown in Table 5.D when routing wires and cables (both inside and outside of an enclosure). Where it is stated that cables must be in separate raceways, they can be routed in the same ladder or trough if barriers are used as required and defined by NEC to provide the separation specified in Table 5.D.
Chapter 5 Planning a DH II Cable System Table 5.D Follow these guidelines for routing cables Route this category of conductor cables: According to these guidelines: Category 1 These conductors can be routed with machine power conductors of up to 600V ac (feeding up to 100 hp devices) if this does not violate local codes. Category 2 General guidelines - these guidelines apply in all cases. • If it must cross power feed lines, it should do so at right angles.
Chapter 6 Constructing a Data Highway II Cable System Chapter Overview In this chapter we explain how to construct a DH II cable system, including how to: install the taps prepare the trunkline cable for installation attach the trunkline cables and terminators to the tap install the droplines Important: Before you begin any procedure explained in this chapter, read Chapter 5, ‘‘Planning a Data Highway II Cable System” for important guidelines and precautions to consider when installing your cable networ
Chapter 6 Constructing a DH II Cable System Mount the tap no more than 11 inches (28.0 cm) from the bottom or left side of the interface module to make sure the dropline cable bend-radius is not less than 3 inches (7.6 cm). Do not mount the tap in a position that routes the dropline cable over the ac power terminals on the interface module. Do not allow the metal shell of the tap to touch a conductive surface.
Chapter 6 Constructing a DH II Cable System Figure 6.2 shows a tap mounted below an interface module. The trunkline runs straight through the side wall of the enclosure. Figure 6.2 A tap mounted below an interface module.
Chapter 6 Constructing a DH II Cable System Figure 6.3 shows taps mounted on the side of an interface module. The trunkline cables run straight through the top of the enclosure. Figure 6.3 Taps mounted on the side of an interface module. Top of Enclosure Redundant Interface Module Dropline Tap Tap Dropline 12646 If you do not connect a dropline to the tap, place the cap over the dropline jack on the front of the tap.
Chapter 6 Constructing a DH II Cable System The cap helps prevent electrical noise. It also prevents contaminants from getting into the tap. Store the unused dropline cable for future use. After installing the taps, the next step is to prepare the trunkline segments for installation. Refer to the next procedure for instructions. Prepare the Trunkline Cable for Installation There are two parts to preparing the trunkline cable for installation.
Chapter 6 Constructing a DH II Cable System 4. Using a stripping tool, remove 0.2 inch (5.1 mm) of dielectric from the end of the cable segment, exposing the center conductor. 17.8mm (0.7 in) 7.6mm (0.3 in) Plug Sleeve 5.1mm (0.2 in) Coaxial Cable Center Conductor Dielectric Insulating Jacket Braided Shield and Foil Shield 12648 5. Push the plug pin as far as possible onto the center conductor of the cable. Plug Pin Dielectric 12648 6.
Chapter 6 Constructing a DH II Cable System 9. Slide the plug sleeve over the braid until it butts up against the shoulder of the plug body. 10. Position the crimping tool over the plug sleeve as close to the plug body shoulder as possible and crimp the plug sleeve. Attach the Trunkline Cables and Terminators to the Tap The next step is to attach the trunkline cables and terminators to the tap. Figure 6.4 shows an example of how to configure the cable segments, taps and terminators in a network.
Chapter 6 Constructing a DH II Cable System Use Figure 6.5 for reference when connecting a trunkline segment and a terminator to a tap at the end of your cable system. Figure 6.5 Connect a trunkline segment and a terminator to an end tap.
Chapter 6 Constructing a DH II Cable System Use Figure 6.6 for reference when connecting two trunkline segments to a tap. Figure 6.6 Connect two trunkline segments to a tap.
Chapter 6 Constructing a DH II Cable System Plug the right-angle plug of the dropline into the DH II port on your interface module. Then plug the other end of the dropline into the jack on the front of the tap. Interface Module Trunkline Cap and Chain Tap Dropline Right-angle plug 12650 For more information on mounting and grounding a DH II interface module, refer to your interface module user’s manual.
Chapter 7 Data Highway 485 Overview Chapter Overview This chapter explains the following: the DH-485 cable system how nodes communicate on DH-485 The DH 485 Cable System Cables are the physical means of transmitting data between nodes. On a DH-485 network, a node is a hardware interface. The DH-485 network passes information between devices on the plant floor.
Chapter 7 DH 485 Overview How Nodes Communicate on DH 485 DH-485 uses token-passing protocol to allow nodes on the network to transmit messages over the cables. With token-passing protocol, only the node possessing the token can transmit messages. As long as a node possesses the token, it is the master. When a node has sent all of its messages or used all of its token-hold time, it passes the token to the node with the next highest address.
Chapter 8 Planning a Data Highway 485 Cable System Chapter Overview The DH-485 cable system gives you flexibility to design a communication network that is tailored to your particular needs. To take full advantage of this flexibility, you should spend sufficient time planning how to install your cable system before assembling any of the hardware. Important: This chapter provides important specifications, guidelines and precautions that you need to know before you construct your DH-485 network.
Chapter 8 Planning a DH 485 Cable System Components of a DH 485 Network In this section we explain the functions and specifications of the following components of a DH-485 network: trunkline link couplers Use Figure 8.1 for reference when reading about these components. Figure 8.1 An example DH 485 network.
Chapter 8 Planning a DH 485 Cable System The trunkline is constructed of Belden 9842 cable. This cable is jacketed and shielded, and consists of two twisted wire pairs and a drain wire. One pair of twisted wires provides a balanced signal line, and one wire of the other pair serves as a common reference line between all nodes on the link. The shield reduces the effect of electromagnetic noise from the industrial environment on the link communications. The drain wire provides a shield connection point.
Chapter 8 Planning a DH 485 Cable System ATTENTION: When determining cable lengths, do not allow tension to be exerted on the cable. Tension on the cable can damage the cable and connectors. To minimize tension, allow sufficient slack in the cable. Selecting the Number of Link Couplers You must install a link coupler for each non-isolated node on the DH-485 network. If you plan to add non-isolated nodes at a later date, provide additional link couplers when you install the initial cable system.
Chapter 8 Planning a DH 485 Cable System Table 8.A Follow these guidelines for grouping conductors Group conductor cables fitting this description: Into this category: Examples: Control & ac Power - high power conductors that are more tolerant of electrical noise than category 2 conductors and may also cause more noise to be picked up by adjacent conductors.
Chapter 8 Planning a DH 485 Cable System application-specific configurations for which the spacing is described in a publication for that specific application Table 8.B Follow these guidelines for routing cables Route this category of conductor cables: According to these guidelines: Category 1 These conductors can be routed with machine power conductors of up to 600V ac (feeding up to 100 hp devices) if this does not violate local codes.
Chapter 9 Constructing a Data Highway 485 Cable System Chapter Overview In this chapter we explain how to construct a Data Highway–485 cable system, including how to: Install the trunkline and DH–485 nodes Important: Before you begin any procedure explained in this chapter, read Chapter 8, ‘‘Planning a DH–485 Cable System” for important guidelines and precautions to consider when installing your cable network.
Chapter 9 Constructing a DH 485 Cable System Figure 9.1 shows an example of a DH–485 network. Figure 9.1 An example DH-485 network.
Chapter 9 Constructing a DH 485 Cable System Prepare the Cable Wire Important: The wire colors of Belden 9842 cable have changed. Refer to the following table to determine the corresponding wire colors of the previous version of Belden 9842 and the current version of Belden 9842.
Chapter 9 Constructing a DH 485 Cable System Connect the Cable to the DH-485 Node 1. Connect the orange–white stripe wire of the orange–white stripe/white–orange stripe pair to terminal 5 (A). 2. Connect the white–orange stripe wire of the orange–white stripe/white–orange stripe pair to terminal 4 (B). 3. Connect the blue–white stripe wire of the blue–white stripe/white–blue stripe pair to terminal 3 (COM). 4. Connect the shield/drain wire (non–jacketed) to Terminal 2 (SHLD).
Chapter 9 Constructing a DH 485 Cable System Terminate the DH-485 Node Shield Only one of the devices in the network requires an earth ground connection for the shield of the communication cable. To provide shield termination, jumper terminal 2 (SHLD) and terminal 1 (CHS GND) together.
Appendix A Constructing RS 232 C and Longline Cables Chapter Overview Appendix A provides information on what types of adapter cables to use when connecting node interface modules to their host processors and to other communication interface modules. Where practical, we provide a wiring diagram so that you can make your own cable. We discuss two types of connections to node interface modules: RS-232-C connections (less than 50 cable feet or 15.
Appendix A Constructing RS-232-C and Longline Cables Table A.A lists the RS-232-C compatible connections and lists which cables you can use for those connections. Table A.A Cables for RS 232 C connections. To connect: To: Use: 1771 KE, 1785 KE, 1771 KF, or 1771 KG module Advisor Color Graphic System or other data terminal equipment (DTE) without handshaking signals 6171 DHCI cable or RS 232 C cable wired according to Figure A.1.
Appendix A Constructing RS-232-C and Longline Cables Longline Connections (up to 7,000 Cable Feet) If you are making connections directly between two Allen-Bradley interface modules, you can often take advantage of a longline communication circuit that lets you extend the link up to 7,000 feet (2135 meters). Table A.B lists the possible longline connections and lists which cables you may use for the connections. Table A.B Cables for longline connections.
Appendix A Constructing RS-232-C and Longline Cables Figure A.1 Connecting a module to an advisor system or other data terminal equipment (DTE) without handshaking. 6171-DHC1 Cable (10 ft.
Appendix A Constructing RS-232-C and Longline Cables Figure A.3 Connecting a module to data communication equipment (DCE) without handshaking. RS-232-C Connector of 1771-KE, 1771-KF, or 1771-KG Module 1 1 AA 2 2 BA 3 3 BB 4 4 CA 5 5 CB 6 6 CD 7 7 AB 8 8 CF 11 20 CC 13 25-pin Male Connector 15-pin Male Connector RS232C Connector or DCE (E.g.
Appendix A Constructing RS-232-C and Longline Cables Figure A.5 Connecting a 1771 KX1 module to a PROVOX system. 1770-CX1 Cable (16.5 ft.
Appendix A Constructing RS-232-C and Longline Cables Figure A.7 Connecting a module to data terminal equipment (DTE) with handshaking.
Appendix A Constructing RS-232-C and Longline Cables Figure A.9 Connecting a module to data communication equipment (DCE) with handshaking. RS-232-C Connector of 1773-KA, or 1775-KA, Module 1 1 AA 2 2 BA 3 3 BB 4 4 CA 5 5 CB 6 6 CD 7 7 AB 8 8 CF 9 22 CE 20 20 CC 25 11 25-pin Male Connector 25-pin Male Connector RS-232-C Connector or DCE (E.g.
Appendix A Constructing RS-232-C and Longline Cables Figure A.11 Connecting a 1771 KG, KE, KF, or 1785 KE to a 6121 AAS with handshaking. 2 2 3 3 6 4 8 1 11 6 7 5 13 7 4 8 5 9-pin Female 6121-AAS 15-pin Male 1771-KG, -KE, -KF, 1785-KE 18772 Figure A.12 Connecting a 1770 KF2 to a 6121 AAS with handshaking.
Appendix A Constructing RS-232-C and Longline Cables Figure A.13 Connecting a 1771 KF, KG, KE or 1785 KE to an IBM PC/AT without handshaking. 1 1 4 6 2 2 7 5 3 3 13 4 7 5 8 6 D - sub 9 - pin (IBM - PC/AT) 8 11 D - sub 15 - pin (1785-KE) 14936 Figure A.14 A Longline connection between 1771 KE, 1771 KF and 1771 KG modules.
Appendix A Constructing RS-232-C and Longline Cables Figure A.15 A longline connection from a 1771 KE, 1771 KF, or 1771 KG module to a 1773 KA or 1775 KA module. Connect the shield at one end only RS-232-C PORT Connector of 1771-KE, 1771-KF, or 1771-KG Module 1 1 2 3 14 25 3 2 13 7 4 4 5 6 User-supplied cable, Belden 8723, or Equivalent (7000 ft.
Appendix A Constructing RS-232-C and Longline Cables Figure A.16 A longline connection between 1773 KA and 1775 KA modules. Connect the shield at one end only RS-232-C CHANNEL connector of 1773-KA or 1775-KA Module 1 1 2 3 7 25 3 2 25 7 4 4 5 5 6 6 8 8 20 20 RS-232-C CHANNEL connector of 1773-KA or 1775-KA Module 12542 Important: For cables longer than 50 feet, conductors 2 and 7, and 3 and 25 must be twisted pairs.
Index C Cable data highway construction of, using 1770-XG connector kits, 3 17 determining length, 2 12 dropline specifications, 2 3 trunkline specifications, 2 3 data highway II construction of, 6 1 determining length, 5 8 dropline specifications, 5 5 ordering, 5 4 trunkline specifications, 5 3 data highway plus construction of using 1770-XG connector kits, 3 17 using daisy chain configuration, 3 32 determining length, 2 12 dropline specifications, 2 3 trunkline specifications, 2 3 data highway-485 constr
I–2 Index components of, 8 2 conductors categories, 8 4 routing, 8 5 construction of, 9 1 determining cable length, 8 3 necessary tools, 8 3 link coupler, 8 3 overview of, 7 1 planning, 8 1 raceway layout considerations, 8 4 trunkline, 8 2, 9 1 DH. See data highway DH II. See data highway II DH+. See data highway plus DH-485.
Index Related Products, iii Related Publications, iv Routing cables, categories, 2 16, 5 13, 8 6 RS-232-C Cable, construction of, A 1 S Specifications data highway dropline, 2 3 station connector, 2 5, 2 6 terminators, 2 11 trunkline, 2 3 data highway II dropline, 5 5 tap, 5 5 terminators, 5 6 trunkline, 5 3 data highway plus dropline, 2 3 station connector, 2 5, 2 6 terminators, 2 11 trunkline, 2 3 data highway-485 link coupler, 8 3 terminators, 9 5 trunkline, 8 2 Station Connector 1770-SC components
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