Siemens SIMATIC NET OBT Operating Instructions Manual
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Siemens SIMATIC NET OBT Operating Instructions Manual

Siemens SIMATIC NET OBT Operating Instructions Manual

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SIMATIC NET
PG/PC - PROFIBUS
PROFIBUS Optical Bus Terminal
(OBT)
Operating Instructions
06/2022
C79000-G8976-C122-08
Introduction
Safety notices
Components of the product
Functional description
Network topology
Commissioning
Help with problems during
operation
Maintenance and
troubleshooting
Technical data
Approvals and certificates
1
2
3
4
5
6
7
8
9
10

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Summary of Contents for Siemens SIMATIC NET OBT

  • Page 1 Introduction Safety notices Components of the product SIMATIC NET Functional description PG/PC - PROFIBUS PROFIBUS Optical Bus Terminal Network topology (OBT) Commissioning Operating Instructions Help with problems during operation Maintenance and troubleshooting Technical data Approvals and certificates 06/2022 C79000-G8976-C122-08...
  • Page 2 Note the following: WARNING Siemens products may only be used for the applications described in the catalog and in the relevant technical documentation. If products and components from other manufacturers are used, these must be recommended or approved by Siemens. Proper transport, storage, installation, assembly, commissioning, operation and maintenance are required to ensure that the products operate safely and without any problems.

  • Page 3: Table Of Contents

    Table of contents Introduction ............................5 Security information ......................6 Safety notices ............................9 Components of the product......................... 11 Functional description ......................... 13 Interfaces .......................... 13 Opto-electrical signal conversion and signal regeneration ........... 13 Supported FO fiber types....................14 Displays ..........................14 Operator controls.......................
  • Page 4 Table of contents PROFIBUS Optical Bus Terminal (OBT) Operating Instructions, 06/2022, C79000-G8976-C122-08...

  • Page 5: Introduction

    Introduction The PROFIBUS OBT (Optical Bus Terminal) it is a network component used in optical PROFIBUS DP fieldbus networks. It allows the connection of either a single device without an integrated optical interface or an RS-485 segment to the optical PROFIBUS DP. The following figure shows an example of a configuration.

  • Page 6: Security Information

    Siemens’ products and solutions undergo continuous development to make them more secure. Siemens strongly recommends that product updates are applied as soon as they are available and that the latest product versions are used. Use of product versions that are no longer supported, and failure to apply the latest updates may increase customer’s exposure to cyber...
  • Page 7 (https://www.siemens.com/cert). Device defective If a fault develops, send the device to your SIEMENS representative for repair. Repairs on-site are not possible. Recycling and disposal The products are low in pollutants, can be recycled and meet the requirements of the WEEE directive 2012/19/EU for the disposal of electrical and electronic equipment.
  • Page 8 Introduction 1.1 Security information PROFIBUS Optical Bus Terminal (OBT) Operating Instructions, 06/2022, C79000-G8976-C122-08...

  • Page 9: Safety Notices

    Safety notices Read the safety notices Note the following safety notices. These relate to the entire working life of the device. CAUTION To prevent injury and damage, read the manual before using the device. Safety notices on use in hazardous areas General safety notices relating to protection against explosion WARNING EXPLOSION HAZARD...
  • Page 10 Safety notices PROFIBUS Optical Bus Terminal (OBT) Operating Instructions, 06/2022, C79000-G8976-C122-08...

  • Page 11: Components Of The Product

    Components of the product Supplied • 1 x PROFIBUS OBT • 1 x Operating instructions (Compact) A5E03345735-01 Not supplied • Plastic fiber-optic cables, sold in meters • Assembly tool for fiber-optic cable connectors • Operating Instructions for the PROFIBUS OBT •...
  • Page 12 Components of the product PROFIBUS Optical Bus Terminal (OBT) Operating Instructions, 06/2022, C79000-G8976-C122-08...

  • Page 13: Functional Description

    Functional description The OBT is a repeater with 3 channels. Interfaces The OBT has the following interfaces for connection of PROFIBUS DP segments: • Channel 1 (CH1) is an electrical RS-485 interface. It is designed as a 9-pin D-sub female connector.

  • Page 14: Supported Fo Fiber Types

    Functional description 4.4 Displays Supported FO fiber types The OBT supports the fiber types listed in the following table: Table 4-1 Achievable FO cable distance between the two devices on optical PROFIBUS DP Fiber type Link length between 2 devices Plastic FO cable 980/1000 μm with 2 fibers and 0.1 to 50 meters max.

  • Page 15: Operator Controls

    Functional description 4.5 Operator controls Figure 4-1 LEDs on the front panel Operator controls The OBT itself does not have any controls. The only point to remember is that the PROFIBUS connecting cable connected to channel 1 (does not ship with product) needs to be terminated at both ends.
  • Page 16 Functional description 4.5 Operator controls PROFIBUS Optical Bus Terminal (OBT) Operating Instructions, 06/2022, C79000-G8976-C122-08...

  • Page 17: Network Topology

    Network topology Optical bus Along with other SIMATIC devices such as the IM 153–2 FO or IM 467 FO, OBTs are connected to optical PROFIBUS DP to form an optical bus. PROFIBUS DP bus nodes with an RS-485 interface are connected to channel 1 of the OBT via bus connectors and a PROFIBUS bus cable.

  • Page 18: Integration Of Long Fo Cable Runs

    Network topology 5.2 Integration of long FO cable runs Integration of long FO cable runs The maximum permitted length of PCF FO cable with the OBT is 300 m. If longer FO links or other FO cable types, for example glass graded index fibers or monomode fibers are necessary, they can be used by combining OBTs with OLMs (Optical Link Module).

  • Page 19: Integrating Rs-485 Segments

    Network topology 5.3 Integrating RS-485 segments Integrating RS-485 segments The OBT allows the attachment of a PROFIBUS RS-485 segment. Figure 5-2 Example of the integration of RS-485 segments PROFIBUS Optical Bus Terminal (OBT) Operating Instructions, 06/2022, C79000-G8976-C122-08...
  • Page 20 Network topology 5.3 Integrating RS-485 segments PROFIBUS Optical Bus Terminal (OBT) Operating Instructions, 06/2022, C79000-G8976-C122-08...

  • Page 21: Commissioning

    Commissioning Note Use the PROFIBUS OBT only as intended in these Operating Instructions. Note Pay particular attention to all warnings and notices relevant to safety. WARNING Operate the PROFIBUS OBT only with safety extra-low voltage complying with IEC 950 / EN 60 950/VDE 0805 of maximum +28.8 V (typically +24 V).
  • Page 22 Commissioning Note Make sure that the PROFIBUS OBT is adequately grounded by connecting the DIN rail or mounting plate to local ground with low resistance and inductance. When securing the module to a mounting plate, run a cable from the grounding terminal of the OBT to the nearest possible ground, keeping the cable as short as possible.
  • Page 23 Commissioning WARNING Lack of equipotential bonding If there is no equipotential bonding in hazardous areas, there is a risk of explosion due to equalizing current or ignition sparks. • Ensure that equipotential bonding is available for the device. WARNING Unprotected cable ends There is a risk of explosion due to unprotected cable ends in hazardous areas.
  • Page 24 Commissioning WARNING Explosion hazard Do not disconnect equipment when a flammable or combustible atmosphere is present. WARNING When used in hazardous environments corresponding to Class I, Division 2 or Class I, Zone 2, the device must be installed in a cabinet or a suitable enclosure. WARNING EXPLOSION HAZARD Replacing components may impair suitability for Class 1, Division 2 or Zone 2.

  • Page 25: Procedure For Commissioning

    Commissioning 6.2 Installation WARNING Transient overvoltages Take measures to prevent transient overvoltages of more than 40% of the rated voltage (or more than 119 V). This is the case if you only operate devices with SELV (safety extra-low voltage). WARNING Suitable cables at high ambient temperatures in hazardous area If the device is operated at max.
  • Page 26 Commissioning 6.2 Installation To remove the module, pull down the locking lever. Figure 6-1 Mounting a module on a DIN rail Mounting on a mounting plate The PROFIBUS OBTs have two holes. These allow mounting on any flat surface, for example on the mounting plate of a cabinet.
  • Page 27 Mounting a module on a mounting plate Instructions for assembling plastic fiber-optic cable (with photos) You will find detailed instructions (with photos) on fitting connectors to plastic fiber-optic cables on the Internet (https://support.industry.siemens.com/cs/de/en/view/35222591) PROFIBUS Optical Bus Terminal (OBT) Operating Instructions, 06/2022, C79000-G8976-C122-08...
  • Page 28 Commissioning 6.2 Installation Connecting the operating power supply NEC CLASS2 24V , 180mA Figure 6-3 Pin assignment of the 3-pin terminal block – grounding terminal ↓ and power supply M, L+ 1. Supply the PROFIBUS OBT only with a stabilized safety extra-low voltage complying with IEC 950 / EN 60 950/VDE 0805 of nominally 24 V (minimum 19.2 V and maximum 28.8 V).
  • Page 29 Commissioning 6.2 Installation A = CH2, optical receiver B = CH2, optical transmitter C = CH3, optical receiver D = CH3, optical transmitter Connect the individual PROFIBUS OBTs using a duplex fiber-optic cable fitted with two pairs of simplex connectors. Make sure that an optical input is connected to an optical output (crossover connection).

  • Page 30: Disassembly

    Commissioning 6.3 Disassembly Disassembly WARNING Improper disassembly Improper disassembly may result in a risk of explosion in hazardous areas. For proper disassembly, observe the following: • Before starting work, ensure that the electricity is switched off. • Secure remaining connections so that no damage can occur as a result of disassembly if the system is accidentally started up.

  • Page 31: Help With Problems During Operation

    Help with problems during operation Help with problems during operation LED display Possible cause of problems L+ 24 V LED not lit • Power supply failed • OBT defective L+ 24 V LED flashes • The transmission speed could not be set CH1 LED not lit •...
  • Page 32 Help with problems during operation 7.1 Help with problems during operation PROFIBUS Optical Bus Terminal (OBT) Operating Instructions, 06/2022, C79000-G8976-C122-08...

  • Page 33: Maintenance And Troubleshooting

    Maintenance and troubleshooting WARNING Unauthorized repair of devices in explosion-proof design Risk of explosion in hazardous areas • Repair work may only be performed by personnel authorized by Siemens. WARNING Impermissible accessories and spare parts Risk of explosion in hazardous areas •...
  • Page 34 Maintenance and troubleshooting PROFIBUS Optical Bus Terminal (OBT) Operating Instructions, 06/2022, C79000-G8976-C122-08...

  • Page 35: Technical Data

    Technical data Table 9-1 Technical specifications General Operating voltage (safety extra-low voltage, SELV or to NEC 24 V= (19.2 V to 28.8 V) Class 2) Current consumption at 24 V input max. 180 mA Bleed resistance between terminal M and terminal 11 Mohms Transmission speed 12 Mbps, 6 Mbps, 3 Mbps, 1.5 Mbps, 500 Kbps, 187.5 Kbps ,...
  • Page 36 Technical data Optical channel Permitted FO cable attenuation (with link power margin) – with plastic fiber 980/1000 13 dB – with PCF fiber 200/230 3 dB Link distance with 3 dB link power margin – with plastic fiber 980/1000 with max. 200 dB/km cable at‐ 0.1 m to 50 m tenuation 0 m to 300 m...
  • Page 37 Technical data Mechanical environmental conditions Oscillation in operation 10 to 58 Hz, 0.075 mm excursion 58 to 150 Hz, 10 m/s2 (1g) acceleration (IEC 60068-2-6) Oscillation during transportation 5 to 9 Hz, 3.5 mm excursion 9 to 500 Hz, 10 m/s2 (1g) acceleration (IEC 60068-2-6) Degree of protection (with external fuse ≤...
  • Page 38 Technical data PROFIBUS Optical Bus Terminal (OBT) Operating Instructions, 06/2022, C79000-G8976-C122-08...

  • Page 39: Approvals And Certificates

    Current approvals on the Internet You will find the current approvals for the product on the Internet pages of Siemens Industry Online Support (https://support.industry.siemens.com/cs/ww/en/ps/15273/cert). Notes for the manufacturers of machines This product is not a machine in the sense of the EC Machinery Directive or the Supply of Machinery (Safety) Regulations (UK).
  • Page 40 Germany Importer UK: Siemens plc, Manchester M20 2UR You can find the current UK Declaration of Conformity for these products on the Internet pages under Siemens Industry Online Support (https://support.industry.siemens.com/cs/ww/en/ps/ 15273/cert). PROFIBUS Optical Bus Terminal (OBT) Operating Instructions, 06/2022, C79000-G8976-C122-08...
  • Page 41 "SIMATIC NET Product Information Use of subassemblies/modules in a Zone 2 Hazardous Area". You will find this document • on the data medium that ships with some devices. • on the Internet pages under Siemens Industry Online Support (https:// support.industry.siemens.com/cs/ww/en/view/78381013).
  • Page 42 Approvals and certificates EMC (electromagnetic compatibility) The SIMATIC NET products described in these operating instructions meet the electromagnetic compatibility requirements according to the EU Directive 2014/30/EU as well as the UK- Regulation SI 2016/1091 and their associated amendments. Applied standards: •...
  • Page 43 Approvals and certificates Underwriters Laboratories Inc. complying with • UL 60950-1 • CSA C22.2 No. 213-M1987 • UL 1604 and 2279-15 Approved for use in Cl. 1, Div. 2, GP. A, B, C, D, T4 Cl. 1, Zone 2, GP. IIC T4 PROFIBUS Optical Bus Terminal (OBT) Operating Instructions, 06/2022, C79000-G8976-C122-08...
  • Page 44 Approvals and certificates PROFIBUS Optical Bus Terminal (OBT) Operating Instructions, 06/2022, C79000-G8976-C122-08...

  • Page 45: Index

    Index Approvals, 39 CE mark, 39 PROFIBUS Optical Bus Terminal (OBT) Operating Instructions, 06/2022, C79000-G8976-C122-08...
  • Page 46 Index PROFIBUS Optical Bus Terminal (OBT) Operating Instructions, 06/2022, C79000-G8976-C122-08...

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