RS 485 Repeater 1 ___________________ Preface 2 ___________________ Introduction SIMATIC RS 485 Repeater 3 ___________________ Description 4 ___________________ Installation 5 ___________________ Connecting 6 ___________________ Technical data Manual 02/2011 A5E03382072-01 7 ___________________ Dimension drawings
Legal information Legal information Warning notice system This manual contains notices you have to observe in order to ensure your personal safety, as well as to prevent damage to property. The notices referring to your personal safety are highlighted in the manual by a safety alert symbol, notices referring only to property damage have no safety alert symbol. These notices shown below are graded according to the degree of danger.
Table of contents 1 Preface ...................................................................................................................................................... 5 2 Introduction................................................................................................................................................ 7 3 Description.................................................................................................................................................
Table of contents RS 485 Repeater 4 Manual, 02/2011, A5E03382072-01
1 Preface Introduction This manual describes the RS 485 repeater. It supports you during the configuration, installation and commissioning. It is intended for people who work in the following areas: the configuring, commissioning and servicing of automation systems. Basic knowledge required This manual presumes general knowledge in the field of automation engineering. Range of validity of this manual The manual is valid for the RS 485 repeater with the order number 6ES7972-0AA02-0XA0.
Preface Service & Support on the Internet In addition to our documentation, we offer a comprehensive knowledge base. On the Internet (http://www.siemens.com/automation/service&support). There you will find: ● Our Newsletter, which constantly provides you with the latest information about your products. ● The right documentation for you using our Service & Support search engine. ● The bulletin board, a worldwide knowledge exchange for users and experts.
Introduction 2 This chapter This chapter describes the RS 485 repeater in detail.
Introduction RS 485 Repeater 8 Manual, 02/2011, A5E03382072-01
3 Description 3.1 Area of application and properties Order number 6ES7972-0AA02-0XA0 What is the RS 485 repeater? The RS 485 repeater amplifies data signals (amplitude, edge slope and signal width) on bus lines and couples segments. Application of the RS 485 Repeater The RS 485 repeater connects two PROFIBUS or MPI segments using RS 485 technology with maximum 32 nodes. It enables transfer rates from 9.6 kbps to 12 Mbps.
Description 3.1 Area of application and properties Rules If you set up a PROFIBUS network with RS 485 repeaters: ● The number of RS 485 repeaters in series must be configured in STEP 7. ● Up to nine RS 485 repeaters may be connected in series. ● The maximum cable length between two nodes with RS 485 repeater may not exceed the values listed in the table below.
Description 3.2 Design of the RS 485 repeater 3.2 Design of the RS 485 repeater The following table shows the design and functions of the RS 485 repeater. Table 3- 3 Design and functions of the RS 485 repeater Design of the repeater no. Function ① Connection for the RS 485 repeater power supply (pin "M5.2" is the ground reference, if you want to measure the voltage difference between terminals "A2" and "B2").
Description 3.
Installation 4.1 4 Installing and uninstalling the RS 485 repeater Overview You can install the RS 485 repeater as follows: ● On an S7-300 mounting rail ● On a standard mounting rail (order number 6ES5710-8MA..) Installation on an S7-300 mounting rail To install the RS 485 repeater on an S7-300 mounting rail, the catch on the rear of the RS 485 repeater must first be removed (see the following figure): 1. Insert a screwdriver below the tongue of the catch (1) and 2.
Installation 4.1 Installing and uninstalling the RS 485 repeater 5. Push it towards the back as far as it will go (5). 6. Tighten the securing screw with a torque of 80 to 110 Ncm (6). Rear: Front: 4 2 1 3 5 6 Figure 4-1 80 to 110 Ncm Installing the RS 485 repeater on an S7-300 mounting rail Removing the repeater from an S7-300 mounting rail To remove the RS 485 repeater from the S7-300 mounting rail: 1. Loosen the fixing screw of the RS 485 repeater (1) and 2.
Installation 4.1 Installing and uninstalling the RS 485 repeater Installation on a standard mounting rail To be able to install the repeater on a standard mounting rail, the catch must be present on the rear of the RS 485 repeater: 1. Fit the RS 485 repeater into the standard mounting rail from above and 2. Push it towards the back until the catch locks it in place. Removal from the standard mounting rail To remove the RS 485 repeater from the standard mounting rail: 1.
Installation 4.
5 Connecting 5.1 RS 485 Repeater in ungrounded and grounded operation Grounded or ungrounded The RS 485 repeater is ● Grounded, if all other nodes on the bus segment are also operated on ground potential ● Ungrounded, if all other nodes in the bus segment are operated on ungrounded potential Note Bus segment 1 is referenced to ground if you connect a PG to the PG/OP socket of the RS 485 repeater.
Connecting 5.1 RS 485 Repeater in ungrounded and grounded operation Wiring diagram In a repeater configuration with ungrounded reference potential (ungrounded operation), any interference currents and static charges are discharged to the protective conductor by means of an RC network integrated in the repeater (refer to the figure below).
Connecting 5.1 RS 485 Repeater in ungrounded and grounded operation Electrical isolation between bus segments Bus segments 1 and 2 are electrically isolated. The PG/OP interface is connected internally to the port for bus segment 1. The figure below shows the front panel of the RS 485 repeater.
Connecting 5.2 Connecting the power supply Amplification of bus signals The amplification of the bus signals takes place between the port for bus segment 1 or the PG/OP interface and the port for bus segment 2. 5.2 Connecting the power supply Cable type To connect the 24 V DC power supply, use flexible cables with a cross section of 0.25 mm2 to 2.5 mm2 (AWG 26 to 14).
Connecting 5.3 Connecting the bus cable 5.3 Connecting the bus cable Connecting the PROFIBUS cable Connect the PROFIBUS cable to the RS 485 repeater, as follows: 1. Cut the PROFIBUS cable to the required length. 2. Strip the PROFIBUS cable as shown in the figure. The braid shield must be folded back on to the cable. Only then can the shield clamp serve as strain relief and as the shield contact.
Connecting 5.4 Configuration options with the RS 485 repeater 5.4 Configuration options with the RS 485 repeater Overview The following section explains the configurations in which you can use the RS 485 repeater: ● Bus segment 1 and bus segment 2 terminated on the RS 485 repeater. ● Bus segment 1 terminated on the RS 485 repeater and bus segment 2 looped through on the RS 485 repeater. ● Bus segment 1 and bus segment 2 looped through on the RS 485 repeater.
Connecting 5.4 Configuration options with the RS 485 repeater Bus segment 1 terminated, bus segment 2 looped through The following figures show how to couple two bus segments using an RS 485 repeater. One bus segment is looped through.
Connecting 5.4 Configuration options with the RS 485 repeater Bus segments 1 and 2 looped through The following figures show how to couple two bus segments using an RS 485 repeater. Each bus cable is looped through on the RS 485 repeater.
Technical data 6.1 General technical data 6.1.1 Standards and approvals 6 Introduction Contents of general technical data: ● The standards and test values that the S7-300 automation system and its associated components comply with and satisfy. ● The test criteria that were used for the test. Note Information on the nameplate You will find the current markings and approvals on the type plate of the respective components. Safety guidelines WARNING Personal injury and damage to property may occur.
Technical data 6.1 General technical data Test symbols and their significance The test symbols and their meaning are described in the following section.
Technical data 6.1 General technical data cULus approval Underwriters Laboratories Inc. complying with ● UL 508 (Industrial Control Equipment) ● CSA C22.2 No. 142 (Process Control Equipment) or cULus HAZ. LOC. - approval +$= /2& Underwriters Laboratories Inc., complying with ● UL 508 (Industrial Control Equipment) ● UL 1604 (Hazardous Location) ● CSA C22.2 No. 142 (Process Control Equipment) ● CSA C22.2 No.
Technical data 6.1 General technical data ATEX approval In accordance with EN 60079-15 (Electrical Apparatus for Potentially Explosive Atmospheres; Type of Protection "n") and EN 60079-0 (Electrical apparatus for potentially explosive gas atmospheres - Part 0: General Requirements) ,, * ([ Q$ ,, 7 7 Marking for Australia and New Zealand The S7-300 automation system satisfies requirements of standards to AS/NZS CISPR 16.
Technical data 6.1 General technical data Use in residential areas Note The S7-300 is designed for use in industrial areas; using it in residential areas could disturb radio and TV reception. To operate an S7-300 in a residential area, it's RF emission must comply with Limit Value Class B to EN 55011.
Technical data 6.1 General technical data 6.1.2 Electromagnetic Compatibility Definition Electromagnetic compatibility (EMC) is the ability of an electrical installation to function satisfactorily in its electromagnetic environment without interfering with that environment. The S7-300 modules also satisfy requirements of EMC legislation for the European domestic market. Compliance of the S7-300 system with specifications and directives on electric design is prerequisite.
Technical data 6.1 General technical data Sinusoidal disturbance The table below shows the EMC compatibility of S7-300 modules in areas subject to sinusoidal disturbance. ● HF radiation HF radiation according to IEC 61000-4-3 Corresponds with degree of severity Electromagnetic HF field, amplitude-modulated 80 MHz to 1,000 MHz; 1.4 GHz to 2 GHz 2.0 GHz to 2.7 GHz 10 V/m 1 V/m 3, 2, 1 80% AM (1 kHz) ● HF coupling HF coupling according to IEC 61000-4-6 Corresponds with degree of severity 3 0.
Technical data 6.1 General technical data 6.1.3 Shipping and storage conditions for modules and backup batteries Introduction The shipping and storage conditions of S7-300 modules surpass requirements to IEC 611312. The data below apply to modules shipped or put on shelf in their original packing. The modules are compliant with climatic conditions to IEC 60721-3-3, Class 3K7 (storage), and with IEC 60721-3-2, Class 2K4 (shipping.) Mechanical conditions are compliant with IEC 60721-3-2, Class 2M2.
Technical data 6.1 General technical data 6.1.4 Mechanical and ambient climatic conditions for S7-300 operation Operating conditions S7-300 systems are designed for stationary use in weather-proof locations. The operating conditions surpass requirements to DIN IEC 60721-3-3.
Technical data 6.1 General technical data Test of mechanical environmental conditions The table below provides important information with respect to the type and scope of the test of ambient mechanical conditions. Condition tested Test Standard Comment Vibration Vibration test to IEC 60068-2-6 (sinusoidal) Type of oscillation: Frequency sweeps with a rate of change of 1 octave/minute. 5 Hz ≤ f ≤ 9 Hz, constant amplitude 3.
Technical data 6.1 General technical data 6.1.5 Specification of dielectric tests, protection class, degree of protection, and rated voltage of S7-300 Test voltage Proof of dielectric strength must be provided in the type test at a test voltage to IEC 61131-2: Circuits with rated voltage Ve to other circuits or ground. Test voltage < 50 V 500 VDC < 150 V 2500 VDC < 250 V 4000 VDC Protection class Protection class I to IEC 60536, i.e.
Technical data 6.2 Technical data the RS 485 Repeater 6.2 Technical data the RS 485 Repeater Technical data the RS 485 Repeater Technical data Power supply Rated voltage 24 VDC Ripple (static limit) 20.4 VDC to 28.8 VDC Current consumption at rated voltage without load on PG/OP socket Max. 100 mA Load on PG/OP socket (5 V/90 mA) Max. 130 mA Load on PG/OP socket (24 V/100 mA) Max.
Technical data 6.2 Technical data the RS 485 Repeater Pin assignment of the sub-D connector (PG/OP socket) View Pin no. Signal name Designation 1 - - 2 M24V Ground 24 V 3 RxD/TxD-P Data line B 4 RTS Request To Send 5 M5V2 Data reference potential (from station) 6 P5V2 Supply plus (from station) 7 P24V 24 V 8 RxD/TxD-N Data line A 9 - - Block diagram of the RS 485 Repeater ● Bus segments 1 and 2 are electrically isolated.
Technical data 6.
7 Dimension drawings 7.1 Dimension drawings RS 485 Repeater on standard mounting rail The figure below shows the dimensional drawing of the RS 485 repeater mounted on the standard mounting rail.
Dimension drawings 7.1 Dimension drawings RS 485 repeater on mounting rail The figure below shows the dimensional drawing of the RS 485 repeater on an S7-300 mounting rail.
Glossary Active RS 485 terminator Separate -> terminating resistor in segments at transmission rates of 9.6 kbps to 12 Mbps. The power supply is separate from the bus nodes. Bus Data transfer bus to which all nodes are connected. It has two defined ends. In the case of PROFIBUS, the bus is a twisted-pair cable or optical fiber cable. Bus connector Physical connection between the node and bus cable. Bus segment -> Segment The bus line between two terminating resistors forms a bus segment.
Glossary DP master In the DP system, the DP master conducts the communication with the DP slaves according to a defined algorithm. To do this, the DP master uses the functions for communication with the DP slaves which are defined by PROFIBUS DP. DP slave The DP slave can be addressed by DP masters. The DP slave provides specified functions (I/O data, diagnostics etc.) to the DP masters.
Glossary Reference potential Reference potential for the evaluation / measuring of the voltages of participating circuits. RS 485 Asynchronous data transmission technology for PROFIBUS DP to ANSI TIA/EIA-RS485-A. RS 485 repeater Device for amplifying bus signals and for linking → segments over long distances. Slave A slave may only exchange data with a master when requested to do so. Slaves include, for example, all DP slaves such as ET 200S, ET 200X, ET 200M etc.
Glossary RS 485 Repeater 44 Manual, 02/2011, A5E03382072-01
Index A Approval, 25 CSA, 26 FM, 27 Marine, 28 UL, 26 Use in industrial environments, 28 Use in residential areas, 29 C Configuration, 22 Connecting Bus cable, 21 Supply voltage, 20 Connecting the bus cable, 21 CSA approval, 26 I IEC 61131, 28 Insulation test, 35 Internet, Service & Support, 6 M Marine approval, 28 Mounting Mounting rail for S7-300, 13 Standard mounting rail, 15 O Order number 6ES7972-0AA01-0XA0, 9 P D Protection class, 35 Degree of protection IP 20, 35 Dimension drawings, 39 distur
Index T Technical data, 36 EMV (Electromagnetic compatibility), 30 Shipping and storage conditions, 32 Standards and approvals, 25 Technical Support, 5 Terminating resistor, 22 Test voltage, 35 U UL certification, 26 ungrounded operation, 17 RS 485 Repeater 46 Manual, 02/2011, A5E03382072-01
