Smart Transmitter Interface Products (HARTr Protocol) Cat. Nos.
Important User Information Because of the variety of uses for the products described in this publication, those responsible for the application and use of this control equipment must satisfy themselves that all necessary steps have been taken to assure that each application and use meets all performance and safety requirements, including any applicable laws, regulations, codes and standards.
Table of Contents Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P 1 Purpose of the Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Organization of the Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . How to Use This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Related Publications . . . . . . . . . . . . . . . . . .
ii Table of Contents Marking the Terminal Block Labels . . . . . . . . . . . . . . . . . . . . . . Connecting the Terminal Blocks to I/O and HART Field Devices . . . Connecting to 1771 I/O Devices . . . . . . . . . . . . . . . . . . . . . . . Connecting to HART Field Devices . . . . . . . . . . . . . . . . . . . . . Connecting a Hand Held Terminal . . . . . . . . . . . . . . . . . . . . . . Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents iii Communicating with the Smart Transmitter Interface . . . . 4 1 Data Routing and Protocol Conversion . . . . . . . . . . . . . . . . . . . . . Data Routing In Poll and Response Mode . . . . . . . . . . . . . . . . . Data Routing in Burst Monitor Mode . . . . . . . . . . . . . . . . . . . . . Protocol Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Definition of Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HART Poll Packets .
iv Table of Contents Read Status and Statistics (hexadecimal command 30) . . . . . . . Reset Statistics Counters (hexadecimal command 31) . . . . . . . . Read ID (hexadecimal command 32) . . . . . . . . . . . . . . . . . . . . Programmable Controller Communication with HART Field Devices Short Frame Word Contents Programmable Controller to Smart Transmitter Interface (Offset at D9:00) . . . . . . . . . . . . . . . .
Table of Contents v DF1 Diagnostic Command Support . . . . . . . . . . . . . . . . . . B 1 Diagnostic Command Support . . . . . . . . . . . . . . . . . . . . . . . . . . . Diagnostic Loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Diagnostic Read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Diagnostic Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Diagnostic Counter Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preface Preface Purpose of the Manual This manual shows you how to use the Smart Transmitter Interface products with Allen-Bradley programmable controllers and other intelligent host computers. It describes how to install and configure the Smart Transmitter Interface products, as well as how to perform trouble-shooting procedures. Organization of the Manual This manual contains five chapters and three appendices.
Preface 8 Channel Terminal Block Cat. No. 1770-HT8 16 Channel Terminal Block Cat. No.
Preface Related Products The Smart Transmitter Interface Products create a communication interface between programmable controllers and HART field devices. They are compatible with HART field devices and with hand-held terminals capable of supporting the physical and data link layers of the HART protocol. Glossary of Terms and Abbreviations This manual uses the following terms as defined below. Actuator: any one of several field devices that provide control functions using a 4-20mA input control signal.
Preface Point-to-point: one HART field device per channel on a terminal block RIO: Remote Input Output link that supports remote, time-critical, I/O and control communications between a master PLC controller and its remote I/O and adapter mode slave processors Transducer/Transmitter: any one of several field devices that can measure pressure, temperature, level, flow, density or other process control variables, and then transmit the value of that variable as a 4-20 mA signal.
Chapter 1 Introducing the Smart Transmitter Interface This chapter provides an overview of the Smart Transmitter Interface products, a brief introduction to the HART protocol and a description of the different system architectures which can be implemented. It also describes the features and benefits of using the Smart Transmitter Interface and lists some of the products that are compatible with the 1770-HT1, 1770-HT8 and 1770-HT16.
Chapter 1 Introducing the Smart Transmitter Interface a programmable controller with Allen-Bradley’s pass-through functionality connected to a host computer on the DH+ network running application software to initiate communications Use the RS-232C port (labelled RS-232 in Figure 1.
Chapter 1 Introducing the Smart Transmitter Interface 1770 HT8/16 Terminal Block The Terminal Blocks pass both analog and digital signals to and from the HART field devices. The analog signal is passed on to devices such as the Allen-Bradley 1771-IFE Analog I/O module. The digital signal is routed to the Communications Controller. Each Terminal Block provides either 8 (1770-HT8) or 16 (1770-HT16) channels.
Chapter 1 Introducing the Smart Transmitter Interface Figure 1.3 1770 HT16 16 Channel Terminal Block Connection to Communications Controller or other Terminal Blocks Loop Power LED Analog I/O Module Connector 1 HT1/HT8/HT16 INTERCONNECT Board Selected LED Board Address Jumpers 8 CHANNEL TERMINAL BLOCK 1 2 3 4 5 6 7 8 RTN SH 1 2 3 4 5 6 7 8 Power Connector Power Fuse + Loop Power RTN SH CATALOG NO.
Chapter 1 Introducing the Smart Transmitter Interface Figure 1.4 Smart Transmitter Interface with Programmable Controller Host CONTROLVIEW DH+ RIO Programmable Controller with Ladder Logic Smart Transmitter Interface HART Field Devices 90032 DH+ Host Communications (Using Programmable Controller Pass-through) Data can also be sent to and received from HART field devices using the pass-through feature of the programmable controller to initiate Block Transfer Reads and Writes (BTR and BTW).
Chapter 1 Introducing the Smart Transmitter Interface Full Duplex Communications With DF1 full duplex systems, you can communicate directly to a single Smart Transmitter Interface. No programmable controllers are necessary—just a computer running the appropriate software, the HART field devices, and the Smart Transmitter Interface between them.
Chapter 1 Introducing the Smart Transmitter Interface Half Duplex Communications DF1 half duplex systems can be considerably more extensive. The host computer can communicate via modems to a number of Smart Transmitter Interfaces spread out over great distances. Once again, though programmable controllers can certainly be a part of such a network, they are not required, and any host with third party software can be used with the Smart Transmitter Interface. Figure 1.
Chapter 1 Introducing the Smart Transmitter Interface The HART Protocol The HART field communications protocol carries digital information with the analog signal over industry-standard 4-20 mA process control loops. Both the digital and analog signals occur simultaneously on the same loop wiring without disrupting the process signal. The HART protocol uses the Frequency Shift Keying technique, based on the Bell 202 communication standard.
Chapter 1 Introducing the Smart Transmitter Interface The HART Protocol and the Smart Transmitter Interface Each Communications Controller can communicate with a maximum of 32 channels via the 1770-HT8 and 1770-HT16 Terminal Blocks. As all channels are multiplexed, communications can only occur over one channel at a time. Each channel can have one HART field device connected to it in point-to-point mode, or up to 15 devices in a multidrop network.
Chapter 1 Introducing the Smart Transmitter Interface Poll/Response Mode The HART protocol supports two modes of digital communications, poll/response and burst. In poll/response mode the host processor requests information from (polls) the smart device. Both point-to-point and multidrop networks can employ this mode. When the host processor sends a request or control information to the HART field devices, the Smart Transmitter Interface reads the routing information in the header portion of the data.
Chapter 1 Introducing the Smart Transmitter Interface clips for DIN rail mounting connections to 32 HART field devices in point-to-point configuration point to point and multidrop wiring support poll and response or burst digital transmission mode support connector for providing loop power interface to Analog I/O modules with 4-20 mA loop support 2 wire and 4 wire transmitters supported Benefits of Using the Smart Transmitter Interface The benefits of using the Smart Transmitter Interface to take advanta
Chapter 1 Introducing the Smart Transmitter Interface perform configuration and diagnostics of HART field devices using third party software and the pass-through feature Compatibility The Smart Transmitter Interface Products create a communication interface between programmable controllers and HART field devices. (See Figure 1.10.
Chapter 1 Introducing the Smart Transmitter Interface Fischer & Porter 50XM1000B Micro Motion RFT9739 Moore Products 340B Princo 50PL4610 Rochester Instrument System SC-6500 Rosemount 1151S Rosemount 3001C Rosemount 3001S Rosemount 3044C Rosemount 3051C Rosemount 8712C Rosemount 8800 Rosemount 9712 Rosemount Analytical 2054pH Smar LD301 Analog I/O Devices 1771-IE05 1771-IF 1771-IFE Hand Held Terminal Rosemount Model 268 Smart Family Interface 1-13
Chapter 1 Introducing the Smart Transmitter Interface Figure 1.10 A Typical Network PLC 5 1771 IFE Modules DH+ Shielded Cables - max. 30 ft. RIO Host Computer 1770 HT1 1770 HT16 1771 ASB RIO Adapter 1771 IFE HART Field Devices 1770 HT8 Point-to-point 1770 HT8 Cable - max. 10000 ft.
Chapter 2 Installing the Smart Transmitter Interface Products This chapter explains how to install the Smart Transmitter Interface products.
Chapter 2 Installing the Smart Transmitter Interface Products Electrostatic Damage Electrostatic discharge can damage semiconductor devices inside the Smart Transmitter Interface products.
Chapter 2 Installing the Smart Transmitter Interface Products Mounting Smart Transmitter Interface Products in a Cabinet Mount the Terminal Blocks in the same equipment cabinet as the Analog I/O modules to which they will be connected. This ensures the integrity of the 4-20 mA analog signal being received by the Analog I/O module. Each unit of the Smart Transmitter Interface is equipped with two plastic feet designed to attach to an EN 50 022 or EN 50 035 DIN rail.
Chapter 2 Installing the Smart Transmitter Interface Products Connecting the Communications Controller to the Terminal Blocks The Communications Controller can support a maximum of 32 HART channels via the Terminal Blocks.
Chapter 2 Installing the Smart Transmitter Interface Products Linear Connection For linear connection the cables go from the 17 pin connector on the Communications Controller to the connector on the first Terminal Block. Another cable of the same kind leads from the connector on the first Terminal Block to the connector on the second Terminal Block, from there to the connector on the third Terminal Block, and so on. Figure 2.
Chapter 2 Installing the Smart Transmitter Interface Products Star Connection For star connection the cables to each Terminal Block lead to the connector on the Communications Controller directly. If you are using a star arrangement, the connector at the Communications Controller will have as many sets of wires leading into it as there are Terminal Blocks. The connector at each Terminal Block will have only one set of wires, leading directly back to the Communications Controller. Figure 2.
Chapter 2 Installing the Smart Transmitter Interface Products Star/Linear Connection Example 3 shows a setup where a combination of star and linear connections are used. In this example, two HT8’s are joined in a linear connection by cable a (a1 and a2) and the other two HT8’s are joined to the HT1 in a star connection by cables b and c. Figure 2.
Chapter 2 Installing the Smart Transmitter Interface Products Connector and Pinout Attach the 17 position Phoenix COMBICON plugs (supplied) to each end of the cable (see Figure 2.6) then plug them into the units. Use the bare wire for chassis ground (to be connected at one end only, preferably to the Communications Controller end). Use only one twisted pair for each " pair of signals. The colors in the table below are intended as examples only. You can use any pair you like for any pair of signals.
Chapter 2 Installing the Smart Transmitter Interface Products Figure 2.6 Attaching Plugs to the Digital Communications Cable 1 1 shield N/C* 1770 HT1 1770 HT8 *N/C = no connection 17 Setting the Board Address Jumpers 17 90074 The Communications Controller can handle up to 32 HART channels via the Terminal Blocks.
Chapter 2 Installing the Smart Transmitter Interface Products Figure 2.8 Terminal Block Board Address Jumpers 1770-HT8 1770-HT16 Channels 1 - 8 Channels 1 - 16 Channels 9 - 16 Channels 9 - 24 Channels 17 - 24 Channels 17 - 32 Channels 25 - 32 Invalid 90019 Figure 2.
Chapter 2 Installing the Smart Transmitter Interface Products Marking the Terminal Block Labels On the label on top of each Terminal Block is a place in the lower left hand corner to record how you have configured the board address jumpers. The jumper address configuration options for the unit are listed (3 options for the 16 channel block and 4 for the eight channel block). Mark the box to indicate which configuration you have used for this Terminal Block. (See Figure 1.2 and 1.3.
Chapter 2 Installing the Smart Transmitter Interface Products Connecting to 1771 I/O Devices Attach the wires from the 1771 Analog I/O devices to the 10 position Phoenix COMBICON plugs supplied with the Terminal Block. Insert the plug(s) into the 10 position Phoenix COMBICON connectors on the upper edge of the Terminal Block (see Figure 2.10). The 1771-HT8 has one connector; the 1771-HT16 has two. Figure 2.11 shows a 1771-IFE connected to a Terminal Block.
Chapter 2 Installing the Smart Transmitter Interface Products Figure 2.
Chapter 2 Installing the Smart Transmitter Interface Products Figure 2.12 Connecting HART Field Devices to the Terminal Block CH 1 CH 2 1 2 SH 1 2 SH CH 3 CH 4 CH 5 C 1 2 SH 1 2 SH 12 position COMBICON connector on Terminal Block + - 12 position COMBICON plug From HART Field Devices 90021 Point-to-point Connection A point-to-point connection exists when only one HART field device is connected to any particular Terminal Block channel.
Chapter 2 Installing the Smart Transmitter Interface Products Figure 2.
Chapter 2 Installing the Smart Transmitter Interface Products Connecting a Hand Held Terminal Because the HART protocol supports up to two digital communication masters at one time, you can use a hand-held terminal to communicate with the HART field devices without disrupting their connection to the Terminal Blocks. To do this, attach the clips of your hand held terminal to either end of the resistor on the Terminal Block that corresponds to the channel to which you wish to connect. (See Figure 2.14.
Chapter 2 Installing the Smart Transmitter Interface Products 1 HT1/HT8/HT16 INTERCONNECT Figure 2.15 HT8 Terminal Block Channels and Corresponding Resistors 8 CHANNEL TERMINAL BLOCK 1 2 3 4 5 6 7 8 + Loop Power RTN SH CATALOG NO. 1770-HT8 VOLTS 24 VDC JP1 E JP1 DE D E CH 1 CH 2 1 2 SH 1 2 SH JP1 JP1 D E CH 3 1 2 SH JP1 D E 1 2 SH JP1 DE D E CH 5 CH 6 1 2 SH 1 2 SH CH 4 JP1 JP1 D E CH 7 1 2 SH D CH 8 1 2 SH 17 Channel 1 resistor ...
Chapter 2 Installing the Smart Transmitter Interface Products Grounding Grounding the Communications Controller and Terminal Block Chassis Because the Communications Controller and the Terminal Blocks can be as far as 1000 feet apart it is best to ground each unit locally. To ground the Communications Controller, connect a wire from the Earth Ground terminal of its 3 position COMBICON power connector (see Figure 2.18) to the local ground bus.
Chapter 2 Installing the Smart Transmitter Interface Products Figure 2.17 Grounding Analog I/O To Analog I/O 10 position COMBICON plug 10 position COMBICON connector on Terminal Block 1 2 3 4 5 6 7 8 RTN SH 90045 Supplying Power to the Communications Controller and Terminal Blocks The Communications Controller requires an external 24 VDC power supply with " 1% voltage regulation. The power supply must provide the Communications Controller with 200 mA of current.
Chapter 2 Installing the Smart Transmitter Interface Products Connecting Power to the Communications Controller To connect the power supply to the Communications Controller: 1. Turn the power supply off. 2. Attach the 3 position Phoenix COMBICON plug (supplied) to the output cable of the power supply. 3. Insert the plug into the power connection header on the upper right corner of the Communications Controller (Figure 2.18). 4. Turn the power supply on.
Chapter 2 Installing the Smart Transmitter Interface Products If a HART field device is a four wire transmitter it must be connected to its own external power supply and the jumper on the Terminal Block for the channel in question set to D (disable). If a HART field device is a two wire transmitter it can be powered through the Transmitter Block. This requires that the Terminal Block be connected to an external power supply by the power connection header in the upper right corner of the block.
Chapter 2 Installing the Smart Transmitter Interface Products 4. Turn the power supply on. Important: The loop power and ground common wires are only needed if the HART field devices connected to the Terminal Blocks draw power from the 4-20 mA current loop instead of from their own individual power supplies. The earth ground wire is needed, whether or not loop power is being supplied. Figure 2.
Chapter 2 Installing the Smart Transmitter Interface Products Figure 2.20 RIO Connector Twinaxial Cable (1770-CD) Shield Blue Clear 1 SH 2 RIO POWER RIO 90014 The pinout is: Signal Label Cable A1 1 Blue wire A2 SH Shield A3 2 Clear wire Use Twinaxial Cable (1770-CD) for the RIO connections.
Chapter 2 Installing the Smart Transmitter Interface Products Activity Indicator Connecting the Communications Controller to the RS 232C Host If the RIO LED is: The RIO link is: Off Inactive On Active, normal communication is in progress Flickering Communications established, but not active A single, full or half duplex, RS-232C serial port using the DF1 protocol provides communications with the host processor.
Chapter 2 Installing the Smart Transmitter Interface Products Table 2.
Chapter 2 Installing the Smart Transmitter Interface Products Figure 2.21 Three Wire Connection to IBM Computer (25 pin) Female 25 pin connector to Communications Controller 1 Female 25-pin connector to Computer Shield TXD 2 3 RXD RXD 3 2 TXD GND 7 7 GND 90005 Figure 2.
Chapter 2 Installing the Smart Transmitter Interface Products If your computer requires active DSR and CTS signals, add jumpers to the computer connections as shown in Figure 2.23 and Figure 2.24. Figure 2.23 Jumper Positions for DSR and CTS Lines (25 pin) Computer Communications Controller 1 Shield TXD 2 3 RXD RXD 3 2 TXD GND 7 7 GND 4 RTS 5 CTS 6 DSR 8 DCD 20 DTR 90007 Figure 2.
Chapter 2 Installing the Smart Transmitter Interface Products If you are using handshake signals with your computer, use the connection shown in Figure 2.25 or Figure 2.26. Figure 2.25 Connection to IBM Computer with Handshake Signals (25 pin) Communications Controller 1 Computer Shield TXD 2 3 RXD RXD 3 2 TXD RTS 4 5 CTS CTS 5 4 RTS GND 7 7 GND DSR 6 20 DTR DCD 8 6 DSR DTR 20 8 DCD 90009 Figure 2.
Chapter 2 Installing the Smart Transmitter Interface Products Modem Connections The Communications Controller can be connected to a modem via a direct 25-pin to 25-pin cable, which you must construct using Belden #8723 (or equivalent) cable. Important: The length of the cable must not exceed 50 feet, and the cable shield must be connected to chassis ground (using Pin 1) at the Communications Controller end only. Figure 2.
Chapter 2 Installing the Smart Transmitter Interface Products DTE Controlled Answer: these unattended modems are directly connected to the phone lines. The Smart Transmitter Interface serves as the data terminal equipment to control the modem via the DTR, DSR and DCD signals. The Smart Transmitter Interface incorporates timeouts and tests to operate these types of modems properly. Auto-Answer: these modems have self-contained timeouts and test, and can answer and hang up the phone automatically.
Chapter 3 Configuring the Communications Controller This chapter explains the communication parameters of the Communications Controller and describes how to set them. System integrators need this information to configure the Communications Controller for the host system. Overview of Configuration Procedures The Communications Controller has two modes of operation, run mode and configuration mode. During normal operation, the Controller functions in run mode.
Chapter 3 Configuring the Communications Controller Figure 3.1 Configuration Display and Push Buttons 1 SH 2 RIO RS-232 POWER RIO RS 232 HART FAULT VIEW Communication Parameter Current Setting DATA EXIT SAVE 90011 Push Buttons Figure 3.1 shows three push buttons labelled VIEW, DATA, and EXIT. The operation of these buttons is described in Table 3.A.
Chapter 3 Configuring the Communications Controller Table 3.
Chapter 3 Configuring the Communications Controller Configure Basic Parameters 2. Each time you press the VIEW button, the parameter number in the left display advances, and the parameter’s current setting appears in the right display. Press the VIEW button as often as necessary or hold it down until the desired parameter is reached. 3. Once the desired parameter is displayed, press the DATA button to cycle through the available settings. 4.
Chapter 3 Configuring the Communications Controller Important: If you change any of the RIO parameters (see Table 3.B) and then press VIEW and EXIT, the display cycles through the numbers 1–3 after showing the three dashes. This indicates that the Communications Controller has saved the new parameters in non-volatile memory, and then gone through a reset cycle to bring the new parameters into effect. Figure 3.
Chapter 3 Configuring the Communications Controller Pressing only the EXIT button while in the sub-menu takes the Communications Controller back to the main menu. You can move between the two menus as much as you need to during any given configuration session. Important: If the Communications Controller is left inactive (i.e., with no buttons pressed) in configuration mode for 3 minutes, it returns to run mode. Any changes made since going into configuration mode will not be saved.
Chapter 3 Configuring the Communications Controller Table 3.B Main Menu: Basic Communication Parameters Parameter Number Parameter Description Factory Default Rack Address Defines the address of the rack containing the Communications Controller. Valid choices are Programmable Logic Controller dependent; maximum is 77 (octal). 01 Starting Module Group Defines the address of the Communications Controller within the rack.
Chapter 3 Configuring the Communications Controller Advanced RS 232C Communication Parameters The advanced communication parameters for the RS-232C link are located in the sub-menu. When parameter 9, the sub-menu entry parameter, is shown on the left display, the right display shows dashes. Press the DATA button to enter the sub-menu and display the sub-menu parameter numbers. The number on the left changes from 9 to 0, and its decimal point lights up, remaining lit as long as you are in the sub-menu.
Chapter 3 Configuring the Communications Controller Table 3.C Sub Menu: Advanced RS 232C Communication Parameters Parameter Number Parameter Description Factory Default Number of Retries Number of allowable retries per attempt on the RS 232C link: Valid numbers are 00 (no retries per attempt) to 10 (10 retries per attempt). 02 DF1 ACK Timeout The time to wait for an acknowledgement (ACK) from the host computer. The timeout is from 0.1 to 5 seconds in 0.1 second increments (1-50).
Chapter 3 Configuring the Communications Controller Verifying the Communication Parameters Before connecting the Communications Controller to your network, cycle through the parameter settings and verify that they are correct for your network. If you have made no changes to the default settings they should appear in the displays. When you connect the Communications Controller to your network and turn it on, the displays cycle through the numbers 1–3 and then turn off.
Chapter 4 Communicating with the Smart Transmitter Interface This chapter provides programming information for communication between host processors (programmable controllers and host computers) and HART field devices via the Smart Transmitter Interface.
Chapter 4 Communicating with the Smart Transmitter Interface Communicating with the Smart Transmitter Interface Figure 4.
Chapter 4 Communicating with the Smart C Transmitter Interface Figure 4.
Chapter 4 Communicating with the Smart Transmitter Interface Definition of Terms Communicating with the Smart Transmitter Interface Table 4.A summarizes the definitions of relevant communications terms used with the Smart Transmitter Interface. Table 4.
Chapter 4 Communicating with the Smart C Transmitter Interface HART Poll Packets The Smart Transmitter Interface transmits HART Poll packets to field devices using the format illustrated in Figure 4.3 and Figure 4.4. The host processor provides data for all fields except the preamble. If you are using a programmable controller as host processor, you provide data for the HART device via Block Transfer Writes to the Smart Transmitter Interface.
Chapter 4 Communicating with the Smart Transmitter Interface Communicating with the Smart Transmitter Interface Figure 4.3 HART Poll Packets Smart Transmitter Interface to HART Field Device (Short Frame Format) Hart Command Short Frame HART Address HART Delimiter Preamble Byte Count Data Check Byte 0 Slave Address Bits Logical Address Bits 0 0 0 0 0 Master Address Bit 0 Secondary Master 1 Primary Master Frame Type 010 STX Frame Reserved Long/Short Frame Bit 0 Short 1 Long 90069 Figure 4.
Chapter 4 Communicating with the Smart C Transmitter Interface Short Frame Address Field This one-byte field contains three bit fields: the master address bit, the logical address bits and the slave address bits. The master address bit differentiates between packets sent from a primary or secondary master. Set this bit to 0 so the Smart Transmitter Interface operates in the preferred mode of primary master. For those applications requiring a secondary master set this bit to 1.
Chapter 4 Communicating with the Smart Transmitter Interface Communicating with the Smart Transmitter Interface Figure 4.5 Unique 38 Bit Device Identifier Bit 37 31 Manufacturer ID 23 Manufacturer's Device Type 15 7 0 Device ID 90073 HART Command This one-byte field specifies the HART command that is to be sent by the Smart Transmitter Interface to the field device. Many commands are device dependent. Table 4.B lists some universal commands supported by all field devices.
Chapter 4 Communicating with the Smart C Transmitter Interface Data This field specifies a number of data bytes associated with the command number given in the command field. Set the number of data bytes to the appropriate value for the command in question. The valid range is from 0 to 113. Only use this field when you are writing data to the HART device. Check Byte The Smart Transmitter Interface calculates the value of this field and transmits it to the field device as the last byte of a packet.
Chapter 4 Communicating with the Smart Transmitter Interface Communicating with the Smart Transmitter Interface HART Address When field devices respond to HART polls they send packets with the same short or long frame address format used in the poll. The field device sets or clears the master address bit depending on which master the response is for. If the device is also bursting data, it sets the burst mode address bit; otherwise it clears this bit.
Chapter 4 Communicating with the Smart C Transmitter Interface Figure 4.
Chapter 4 Communicating with the Smart Transmitter Interface Communicating with the Smart Transmitter Interface Response Code This two-byte code contains the HART field device status as sent by that device. Field devices detecting a communications error set the most significant bit (bit 7) of the first byte and identify the error in the other seven bits as shown in Table 4.C.
Chapter 4 Communicating with the Smart C Transmitter Interface Table 4.D HART Field Device Error Codes Bit Error Code Description 7 Field Device Malfunction An internal hardware error or failure has been detected by the HART field device. 6 Configuration Changed A write or set command has been executed by the HART field device. 5 Cold Start Power has been removed and reapplied resulting in the reinstallation of the setup information.
Chapter 4 Communicating with the Smart Transmitter Interface Smart Transmitter Interface Packets Received by the Smart Transmitter Interface Communicating with the Smart Transmitter Interface Figure 4.8 illustrates the format of Smart Transmitter Interface packets received by the Smart Transmitter Interface. The programmable controller data files or host computer data buffers are formatted similarly for transmission of data to the Smart Transmitter Interface.
Chapter 4 Communicating with the Smart C Transmitter Interface Table 4.E Valid Smart Transmitter Interface Commands from the Programmable Controller or Host Computer Command Number (Hex) Smart Transmitter Interface Command Description 00 No Operation Command is ignored by the Smart Transmitter Interface. A No Error response is sent if requested by the host.
Chapter 4 Communicating with the Smart Transmitter Interface Communicating with the Smart Transmitter Interface The other bits in this byte are used for communication between host computers residing on the Data Highway Plus and the Smart Transmitter Interface. This communication requires special software on the host computer and can only occur with programmable controllers which support “pass through” functionality.
Chapter 4 Communicating with the Smart C Transmitter Interface Figure 4.
Chapter 4 Communicating with the Smart Transmitter Interface Communicating with the Smart Transmitter Interface Table 4.F Smart Transmitter Interface Error Codes Error Code (hex) Definition Description General Errors 00 No Error The Smart Transmitter Interface processed the last received command, and no errors were detected. 01 Downloading Firmware The Smart Transmitter Interface firmware is being upgraded over the RS 232C port. The last received command cannot be processed.
Chapter 4 Communicating with the Smart C Transmitter Interface Smart Transmitter Interface Data Certain Smart Transmitter Interface commands require this extended data field to provide additional data to the host processor. When not required this field is not sent by the Smart Transmitter Interface. Valid Smart Transmitter Interface Commands and Responses Table 4.
Chapter 4 Communicating with the Smart Transmitter Interface Communicating with the Smart Transmitter Interface No Operation (hexadecimal command 00) The Smart Transmitter Interface performs “no operation” when it receives this command. Use it to simplify your programmable controller ladder logic by issuing BTWs and BTRs in pairs, and using this command when no specific information is required from the Smart Transmitter Interface.
Chapter 4 Communicating with the Smart C Transmitter Interface The field device response may not be available for several hundred milliseconds, so if you wish an immediate response to a BTR, set bit 0 of the Smart Transmitter Interface Parameter field. The Smart Transmitter Interface will then respond immediately to a BTR with either a HART field device response, if available, or a Smart Transmitter Interface Error Code hexadecimal 03.
Chapter 4 Communicating with the Smart Transmitter Interface Communicating with the Smart Transmitter Interface Set Number of Retries (hexadecimal command 21) Use this command to set the number of retries (from 0 to 15) the Smart Transmitter Interface attempts for a specified channel when a field device fails to respond to the initial HART Poll command. The default number of retries is 3. The number of retries is specified in the Smart Transmitter Interface Parameter field of the header.
Chapter 4 Communicating with the Smart C Transmitter Interface Table 4.
Chapter 4 Communicating with the Smart Transmitter Interface Communicating with the Smart Transmitter Interface Table 4.
Chapter 4 Communicating with the Smart C Transmitter Interface Table 4.J Response to Read ID Command Data Byte description Mode/Status Byte 00 (No Modes) 2 Interface/Processor Type EE (Extended) 3 Extended Interface Type 34 DF1 on RS 232 in Full Duplex mode 36 DF1 on RS 232 in Half Duplex mode 4 Extended Processor Type 57 5 Series/Revision Bits 0 4: Bits 5 7: Programmable Controller Communication with HART Field Devices Status reply 1 0 = Revision A 1 = Revision B, etc.
Chapter 4 Communicating with the Smart Transmitter Interface Communicating with the Smart Transmitter Interface Figure 4.
Chapter 4 Communicating with the Smart C Transmitter Interface Table 4.
Chapter 4 Communicating with the Smart Transmitter Interface Communicating with the Smart Transmitter Interface Rung 4: Sets B3:1 if a non-zero error code was received from the Smart Transmitter Interface. This forces rung 0 to be true on the next scan so that HART command #0 will be sent to the field device. A check is also made on B3:6 which you can set if you wish to restart the cycle by sending HART command #0 to the field device.
Chapter 4 Communicating with the Smart C Transmitter Interface Word 01: Smart Transmitter Interface control hexadecimal 00 indicating a response is required from the Smart Transmitter Interface (low byte); Smart Transmitter Interface parameter hexadecimal 00 (high byte). Word 02: HART delimiter hexadecimal 02 indicating an STX frame with a short frame address (low byte); HART short frame address hexadecimal 80 indicating primary master, and logical and slave addresses 0 (high byte).
Chapter 4 Communicating with the Smart Transmitter Interface Communicating with the Smart Transmitter Interface Table 4.
Chapter 4 Communicating with the Smart C Transmitter Interface Word 09: HART hexadecimal flag assignment is 00 (low byte); most significant byte of 24 bit device identification number is hexadecimal 00 (high byte). Word 10: middle byte of 24 bit device identification number is hexadecimal 15 (low byte); least significant byte is hexadecimal 11 (high byte). The 24 bit device ID is hexadecimal 001511. Word 11: HART packet check byte received is hexadecimal 09 (low byte); zero padding (high byte). Table 4.
Chapter 4 Communicating with the Smart Transmitter Interface Communicating with the Smart Transmitter Interface Word 01: Smart Transmitter Interface Control is hexadecimal 00 indicating a response is required from the Smart Transmitter Interface (low byte); Smart Transmitter Interface Parameter is hexadecimal 00 (high byte).
Chapter 4 Communicating with the Smart C Transmitter Interface Table 4.
Chapter 4 Communicating with the Smart Transmitter Interface Communicating with the Smart Transmitter Interface Word 02: HART delimiter is hexadecimal 86 indicating an ACK frame with a long frame address (low byte); HART long frame address is hexadecimal A6 indicating primary master, burst mode disabled, and the manufacturer’s identification code of hexadecimal 26 for Rosemount (high byte).
Chapter 4 Communicating with the Smart C Transmitter Interface Full Duplex Full duplex protocol: is a direct link that allows simultaneous two-way transmission requires a system programmer to use interrupts and multi-tasking techniques is intended for high performance applications where maximum data throughput is necessary gives faster data throughput than half duplex, but is more difficult to implement Figure 4.
Chapter 4 Communicating with the Smart Transmitter Interface Communicating with the Smart Transmitter Interface Half duplex protocol can be used on a point-to-point link, but more usually operates on a link with all nodes interfaced through half duplex modems. There may be from 0 to 63 decimal nodes simultaneously connected to a single link. Figure 4.
Chapter 4 Communicating with the Smart C Transmitter Interface DF1 Packet Formation In full duplex mode, the host computer and Smart Transmitter Interface can transmit and receive simultaneously. Once the Smart Transmitter Interface receives a command, it can send the response to the host as soon as it is available, without waiting for the host to request the response with a separate command. Figure 4.13 and Figure 4.14 illustrate the format and give an example of a full duplex DF1 command.
Chapter 4 Communicating with the Smart Transmitter Interface Communicating with the Smart Transmitter Interface Figure 4.14 Example Full Duplex DF1 Command Enable Poll and Response Mode DLE STX 10 02 DST SRC CMD STS OF 00 TNS FNC LEN 95 04 Smart Transmitter Interface Packet 01 FF 00 00 DLE ETX 10 03 BCC Figure 4.
Chapter 4 Communicating with the Smart C Transmitter Interface In both full duplex and half duplex mode the DF1 responses from the Smart Transmitter Interface are identical. These responses are sent immediately by the Smart Transmitter Interface in full duplex mode. However, in half duplex mode the host must first send a poll to the Smart Transmitter Interface before it will send the DF1 Response. Figure 4.17 and Figure 4.18 illustrate the format and an example of these responses. Figure 4.
Chapter 4 Communicating with the Smart Transmitter Interface Communicating with the Smart Transmitter Interface Figure 4.18 DF1 Response Enable Poll and Response Mode DLE STX 10 02 DST SRC CMD STS 4F 00 TNS LEN 04 Smart Transmitter Interface Packet 01 FF 00 00 DLE ETX 10 03 Command 0F with FNC 95 and command 06 as described in Appendix B are the only commands supported by the Smart Transmitter Interface.
Chapter 5 Troubleshooting To aid in troubleshooting, this chapter tells you how to interpret the indicators (status LEDs and seven-segment LED displays) on the Communications Controller (1770-HT1) and the Terminal Blocks (1770-HT8/16). If you are unable to save new configurations successfully, the left display will display hardware fault 6, and the Fault LED on the front will light up. This indicates a malfunction in the module.
Chapter 5 Troubleshooting Interpreting the Communications Controller Status LEDs There are five status LEDs on the front panel of the Communications Controller. These indicators can help you diagnose problems with the module’s installation and operation. Table 5.
Chapter 5 Troubleshooting Interpreting the Communications Controller Numeric Displays The numeric displays are used to indicate hardware fault conditions. When the fault indicator is lit, the left display will show a number indicating the type of hardware fault. Table 5.C gives a description of the faults. Table 5.
Appendix A Product Specifications Communications Controller (1770 HT1) RS 232 Interface Start Bits Data Bits Parity Stop Bits Baud Rates Connector Output Protocol 1 8 None, Even, Odd 1 300, 600, 1200, 2400, 4800, 9600, 19200 DB-25P (male) RS-232C Allen-Bradley DF1 RIO Interface Baud Rates Rack Size Connector Cable Cable Length Output Termination Protocol 57600, 115200, 230400 1/4 rack Phoenix COMBICON header and plug – 3 position Standard “blue hose” shielded twisted-pair cable (Belden 9463) 10,000
Appendix A Product Specifications Electrical DC Input Voltage Fuse Connector Power Consumption 24 VDC "1% (600 mA maximum load) UL 198G and CSA 22.2, No. 59 rated, 5mm x 20mm, 1.0 Amp., 250V, fast acting Phoenix COMBICON header and plug 3 position, 12-24 AWG 4.8 watts maximum Physical Dimensions Weight Mounting 4.3” (10.9 cm) wide x 14.0” (35.6 cm) long x 2.7” (6.9 cm) high 1.8 lb (0.
Appendix A Product Specifications Electrical DC Input Voltage DC Current Fuse Connector Power Consumption 24 - 32 VDC for 4-20 mA current loops if required Maximum of 0.2A or as required for all 4-20 mA current loops connected UL 198G and CSA 22.2, No. 59 rated, 5mm x 20mm, 0.25 Amp., 250V, fast acting Phoenix COMBICON header and plug 3 position, 12-24 AWG 4.8 watts maximum or as required for all 4-20 mA current loops connected Physical Dimensions Weight Mounting 4.3” (10.9 cm) wide x 9.
Appendix A Product Specifications 4 20 mA Current Loop Interfaces (see Figure A.1) Channels I/O Module Connector sixteen 4-20 mA current loops Phoenix COMBICON header and plug 10 position, 2 sets, 12-24 AWG, I/O Module Cable Length 30 foot (9 m) maximum between the Terminal Block and the Analog I/O module Field Device Connector Phoenix COMBICON header and plug 12 position, 4 sets, 12-24 AWG Loop Fuses UL 198G and CSA 22.2, No. 59 rated, 5mm x 20mm, 0.1 Amp.
Appendix A Product Specifications HART Communications Specifications The communications specifications conform to HART Field Communications protocol.
Appendix A Product Specifications Figure A.1 Loop Power Selection Indicates Direction of Current Analog I/O Module CH1 CH2 24 32 VDC Power Supply + COM Earth Ground 1 2 SH 1770-HT8 0.25A 1770-HT16 0.50A JP1 D E Low Pass Filter E Low Pass Filter Coupling Capacitors Interface to Transceiver Circuitry of 1770-HT1 RC Constant of 55 ms RTN SH D JP2 0.1 A 0.1 A 1 2 1 2 Though not indicated, all shield connections are connected to each other.
Appendix B DF1 Diagnostic Command Support The information in this appendix deals only with RS-232C DF1 communications, between the host processor and the Communications Controller. Diagnostic Command Support The Communications Controller interprets and responds to the following diagnostic commands from the host processor: Table B.
Appendix B DF1 Diagnostic Command Support Diagnostic Read This command reads the diagnostic counters from the Communications Controller. The format of these counters is given below. The address and size fields can have any value (but they must be included). Figure B.3 Diagnostic Read Command Format ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ 1 byte 1 byte 2 bytes 1 byte 2 bytes 1 byte CMD 06 STS TNS FNC 01 ADDR 0000 SIZE 00 Figure B.
Appendix B DF1 Diagnostic Command Support Figure B.5 Diagnostic Status Command Format ÁÁÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 1 byte 1 byte 2 bytes 1 byte CMD 06 STS TNS FNC 03 Figure B.6 Diagnostic Status Reply Format ÁÁÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁ 1 byte 1 byte 2 bytes 24 bytes CMD 46 STS TNS DATA Diagnostic Counter Reset This command resets the diagnostic counters listed in Table B.B. Figure B.
Appendix C B Cable Length and Power Supply Requirements This appendix discusses cabling requirements between the Terminal Blocks and the Communications Controller for control signals and 24VDC power, explains how to determine when a separate 24VDC power supply is needed for a Terminal Block and describes how to connect it. It also provides further details about supplying 4-20mA loop power to 2 wire HART field devices from a Terminal Block.
Appendix C Cable Length and Power Supply Requirements If the Terminal Blocks are to receive power via the cable, the power cable length requirements explained below must be adhered to. If a Terminal Block is too far from the Communications Controller to meet these cabling requirements, an external 24 VDC power supply must be used.
Appendix C Cable Length and Power Supply Requirements Figure C.3 Determining Maximum Cable Lengths for Linear Connection 1170-HT1 1770-HT8 1770-HT8 1770-HT8 1770-HT8 a b c d Control Signals +24 VDC Power Pin 2 Total cable lengths <= 1000 ft or <= 305 m a + b + c + d <= 1000 / (0.065 * R) where R = cable resistance per 1000 ft or a + b + c + d <= 1/(0.065 * R) where R = cable resistance per meter 90055 Figure C.
Appendix C Cable Length and Power Supply Requirements Using a Separate Power Supply for a Terminal Block One way of overcoming the maximum power length restrictions required to carry power to the Terminal Blocks is to use a local power supply at the site of the Terminal Blocks, rather than providing 24 VDC via the cable between the Communications Controller and the Terminal Blocks. This power supply must be connected to pins 2 (+) and 3 (–) of the 17 position connector.
Appendix C Cable Length and Power Supply Requirements Cabling and Power Supply Requirements for Loop Power 3. Connect the wire from the negative terminal in the power supply to pin 3 in the 17 pin connector on the cable. 4. Insert the connector on the cable into the 17 pin connector header on the Terminal Block. 5. Turn on the power to the power supply.
Appendix C Cable Length and Power Supply Requirements Table C.A Typical Supply Voltages Cable Length (ft) Wire Gauge AWG Supply Voltage 3051 Supply Voltage 3044 100 16 21.8 23.8 20 21.8 23.8 24 21.9 23.9 16 21.9 23.9 20 22.0 24.0 24 22.3 24.3 16 22.0 24.0 20 22.2 24.2 24 22.8 24.8 16 22.1 24.1 20 22.5 24.5 24 23.4 25.4 16 22.2 24.2 20 22.7 24.7 24 23.9 25.9 16 22.7 24.7 20 24.0 26.0 24 27.0 29.0 16 23.6 25.6 20 26.1 28.
Index Symbols **Empty**, 2 1 A Address, station, 3 7 Advanced communication parameters, 3 8 Analog signal, 1 8 B Basic communication parameters, 3 6 Block Transfer Read, 4 2, 4 4, 4 25 Block Transfer Write, 4 2, 4 4, 4 25 Burst Data table, 4 2, 4 4, 4 20, 4 21 Burst Monitor mode, 4 2, 4 20 Byte count, 4 8, 4 11 C Chassis ground, 2 24 Check byte, 4 9, 4 13 Clear to Send, 2 25 Commands Diagnostic, B 1 Diagnostic Counter Reset, format, B 3 Diagnostic Loop, format, B 1 Diagnostic Read, format, B 2 Diagnosti
I–2 Index Digital signal, 1 8 Handshake, enabled/disabled, 3 9 Displays, 3 1 Handshake signals, connection to IBM computer with, 2 28 Duplicate message, 3 9 E Electrical specifications Communications Controller, A 2 Terminal Block HT16, A 4 Terminal Block HT8, A 3 End of Message to RTS Off, 3 9 Environmental specifications Communications Controller, A 2 Terminal Block HT16, A 4 Terminal Block HT8, A 3 Error detection, 3 7 Exit, 3 2 without saving, 3 5 F Factory defaults, 3 3 Fault, 5 3 hardware faul
Index Terminal Block, 5 1 Loop power selection, A 6 M Maximum cable length from the RS 232C port to a host, 2 24 power cable, C 3 Menus main, 3 1, 3 7 sub, 3 1, 3 9 Modem, 2 25 cabling considerations, 2 28 connections, 2 29 Modes of operation, 3 1 Multidrop connection, 2 14 N Numeric displays interpreting, 5 3 malfunction, 5 1 P Parameter number, 3 6 Physical specifications Communications Controller, A 2 Terminal Block HT16, A 4 Terminal Block HT8, A 3 Point to point connection, 2 14 Poll and Response m
I–4 Index T Terminal Blocks board address jumpers, 2 9 function, 1 3 illustration 1770 HT16, 1 4 1770 HT8, 1 3 JP jumper blocks, 2 20 using a separate power supply for, C 4 Timeout, DF1 ACK, 3 9 Transmit Data, 2 25 U Unable to save, 5 1 V Values, Diagnostic Read Reply, B 2 Verifying parameters, 3 10 View, 3 2
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