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Siemens SIMATIC NET PC PROFIBUS, Operating Instructions Manual

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Siemens SIMATIC NET PC PROFIBUS Operating Instructions Manual Download Page 15

 

Network topology 

 

4.3 Integrating RS-485 segments 

PROFIBUS Optical Bus Terminal (OBT) 
Operating Instructions, 04/2016, C79000-G8976-C122-07 

15

 

4.3

 

Integrating RS-485 segments 

The OBT allows the attachment of a PROFIBUS RS-485 segment. 

 

Image 4-2 

Example of the integration of RS-485 segments 

Summary of Contents for SIMATIC NET PC PROFIBUS

Page 1: ..._______ ___________________ ___________________ SIMATIC NET PG PC PROFIBUS PROFIBUS Optical Bus Terminal OBT Operating Instructions 04 2016 C79000 G8976 C122 07 Introduction 1 Components of the product 2 Functional description 3 Network topology 4 Commissioning 5 Help with problems during operation 6 Technical data 7 Approvals and certificates 8 ...

Page 2: ...ion may be operated only by personnel qualified for the specific task in accordance with the relevant documentation in particular its warning notices and safety instructions Qualified personnel are those who based on their training and experience are capable of identifying risks and avoiding potential hazards when working with these products systems Proper use of Siemens products Note the followin...

Page 3: ...al regeneration 9 3 3 Supported FO fiber types 10 3 4 Displays 10 3 5 Operator controls 12 4 Network topology 13 4 1 Optical bus 13 4 2 Integration of long FO cable runs 14 4 3 Integrating RS 485 segments 15 5 Commissioning 17 5 1 Procedure for commissioning 20 5 2 Installation 20 6 Help with problems during operation 27 6 1 Help with problems during operation 27 7 Technical data 29 8 Approvals an...

Page 4: ...Table of contents PROFIBUS Optical Bus Terminal OBT 4 Operating Instructions 04 2016 C79000 G8976 C122 07 ...

Page 5: ...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 Image 1 1 Example of an optical PROFIBUS DP configuration ...

Page 6: ...utomatically electrical isolation so that potential differences as can occur in extensive plants are no longer noticed 1 HCS is a registered trademark of Spectran Speciality Optics and stands for Hard Polymer Cladded Silica Fiber Sensitivity Just as the FO cable is insensitive to EMC interference an FO cable also emits no electromagnetic waves into its environment Sensitive electronic devices loca...

Page 7: ... 07 7 Components of the product 2 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 Fiber optic cable connectors ...

Page 8: ...Components of the product PROFIBUS Optical Bus Terminal OBT 8 Operating Instructions 04 2016 C79000 G8976 C122 07 ...

Page 9: ...ex male connectors is connected to each of these duplex female connectors The OBT also has a 3 pin terminal for connection of the 24 V power supply and if necessary a ground cable 3 2 Opto electrical signal conversion and signal regeneration The OBT converts the RS 485 level received at channel 1 into an optical signal level that is output via channels 2 and channel 3 Signals received at channel 2...

Page 10: ...BT This is for example the case with the IM 153 2 FO and IM 467 FO The transmission speed is not dependent on the fiber type used or the cable length This can be up to 12 Mbps The following accessories are available Plastic fiber optic cable sold in meters connectors polishing set and the assembly tool for plastic fiber optic cable The plastic fiber optic cables do not have connectors fitted The p...

Page 11: ...plays PROFIBUS Optical Bus Terminal OBT Operating Instructions 04 2016 C79000 G8976 C122 07 11 CH1 CH2 CH3 channel 1 to 3 yellow not lit Data is not being received lit yellow Data is being received Image 3 1 LEDs on the front panel ...

Page 12: ...l OBT 12 Operating Instructions 04 2016 C79000 G8976 C122 07 3 5 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 13: ...ds The FO connection between two devices is established by the optical transmitter of one device being connected to the optical receiver of the other device via a fiber while the optical receiver of the first device is connected to the optical transmitter of the other crossover cable If an OBT or a fiber optic cable fails the network is split into two separate networks Depending on the location of...

Page 14: ...ndex fibers or monomode fibers are necessary they can be used by combining OBTs with OLMs Optical Link Module In this situation the OBT is connected electrically with the OLM OBT CH 1 to OLM CH 1 and the OLM is connected to the long FO cable link At the end of the FO cable link the combination is reversed with a second OLM OBT pair Image 4 1 Example of covering longer FO links with OBTs and OLMs T...

Page 15: ...egments PROFIBUS Optical Bus Terminal OBT Operating Instructions 04 2016 C79000 G8976 C122 07 15 4 3 Integrating RS 485 segments The OBT allows the attachment of a PROFIBUS RS 485 segment Image 4 2 Example of the integration of RS 485 segments ...

Page 16: ...Network topology 4 3 Integrating RS 485 segments PROFIBUS Optical Bus Terminal OBT 16 Operating Instructions 04 2016 C79000 G8976 C122 07 ...

Page 17: ...ally 24 V The power source must meet the requirements of the UL CSA approval for NEC Class 2 according to the National Electrical Code r ANSI NFPA 70 Note Never look directly into the opening of the optical transmission diode The emitted light beam could endanger your eyes Note Never connect the PROFIBUS OBT to a 100 V 240 V power supply Note Install the device so that the climatic limit values in...

Page 18: ...ted To do this strip the insulation from the end of the PROFIBUS cable and connect the shield to functional earth Note Only use bus cables approved for PROFIBUS as the RS 485 bus cable Note The OBT housing must not be opened General notices on use in hazardous areas WARNING Risk of explosion when connecting or disconnecting the device WARNING EXPLOSION HAZARD DO NOT CONNECT OR DISCONNECT EQUIPMENT...

Page 19: ...RNING Requirements for the cabinet enclosure The modules must be installed in a suitable enclosure with at least degree of protection IP54 according to EN 60529 The environmental conditions under which the equipment will be used must be taken into account WARNING Protection against transient voltage surges Take measures to prevent transient voltage surges of more than 40 of the rated voltage This ...

Page 20: ... 35 x 15 or directly on a flat surface 1 Install the device so that the climatic limit values in the technical specifications are adhered to 2 Make sure that there is adequate space to connect the bus and power supply cables 3 Mount the modules only on a rail or mounting plate that is grounded with low resistance and inductance When securing the module to a mounting plate run a cable from the grou...

Page 21: ... These allow mounting on any flat surface for example on the mounting plate of a cabinet Drill two holes in the mounting plate as shown in the drilling template in Figure 5 2 Secure the module with two machine screws for example M3 x 75 and M3 x 55 Make sure that there is a reliable electrical connection between the terminal of the module housing and the grounded mounting plate using a grounding c...

Page 22: ...00 G8976 C122 07 Image 5 2 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 ...

Page 23: ...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 The power source must meet the requirements of NEC Class 2 according to the UL CSA approval 2 If the PROFIBUS OBT is not mounted on a grounded DIN rail run a grounding cable with a cross section of 2 5 mm2 from the terminal to the n...

Page 24: ...ors Make sure that an optical input is connected to an optical output crossover connection Provide adequate strain relief for the fiber optic cable and remember the minimum bend radii of the FO cable Close unused FO cable sockets with the supplied plastic plugs Incident light from the surroundings can cause disturbances on the PROFIBUS network particularly if the surroundings are very bright Remem...

Page 25: ...PROFIBUS DP end device or an RS 485 segment CH1 is designed as an electrical RS 485 interface with a 9 pin D sub female connector 1 As the RS 485 bus cable use only shielded and twisted SIMATIC NET two wire cables for PROFIBUS 2 Do not connect any RS 485 bus cables that are laid entirely or partly outdoors Otherwise lightning strikes in the surroundings could destroy the PROFIBUS OBTs If you have ...

Page 26: ...Commissioning 5 2 Installation PROFIBUS Optical Bus Terminal OBT 26 Operating Instructions 04 2016 C79000 G8976 C122 07 ...

Page 27: ...able Interruption of one of the two wires of the RS 485 bus cable and A or B connected to wrong terminal Missing or incorrect termination CH2 CH3 LED not lit Send and receive FO cable connected to wrong socket Interruption of the receive FO cable to the partner mod ule No partner module connected or connected partner module is not turned on Connected partner module is defective not transmitting CH...

Page 28: ...Help with problems during operation 6 1 Help with problems during operation PROFIBUS Optical Bus Terminal OBT 28 Operating Instructions 04 2016 C79000 G8976 C122 07 ...

Page 29: ... Input channel 1 to 3 Bit length jitter 0 7 to 1 3 tBit 0 03 to 0 03 tBit Output channel 1 to 3 Bit length jitter 0 99 to 1 01 tBit 0 003 to 0 003 tBit Signal latency any input output 6 tBit Cascading depth optical bus limited only by latency Electrical channel Input output signal RS 485 level Input dielectric strength 7 V to 12 V Minimum current at 5 V for terminators 10 mA Electrical isolation t...

Page 30: ...ntact dis charge IEC 61000 4 2 Immunity against RF radiation 10 V m at 80 amplitude modulation with 1 kHz 80 MHz 1 GHz ENV 50140 IEC 61000 4 3 10 V m with 50 load factor at 900 MHz to ENV 50 204 10 V m at 80 amplitude modulation with 1 kHz 10kHz 80 MHz ENV 50141 Immunity to conducted disturbances burst On power supply cables and shielded RS 485 bus cables 2 kV IEC 61000 4 4 Immunity to conducted d...

Page 31: ...exposure time 3 h temperature change 3 K min 5 cycles IEC 60068 2 14 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 8 A IP30 Weight 400 g Dimensions 50 5...

Page 32: ...Technical data PROFIBUS Optical Bus Terminal OBT 32 Operating Instructions 04 2016 C79000 G8976 C122 07 ...

Page 33: ...rdous substances The SIMATIC NET products described in these operating instructions meet the requirements of the EC directive 2011 65 EC for the restriction of the use of certain hazardous substances in electrical and electronic equipment Applied standard EN 50581 Technical documentation for the assessment of electrical and electronic products with respect to restriction of hazardous substances De...

Page 34: ...rective 2006 42 EEC There is therefore no declaration of conformity relating to the current version of the EC Machinery Directive 2006 42 EEC for these products If the products are part of the equipment of a machine they must be included in the declaration of conformity procedure by the manufacturer of the machine Explosion protection directive ATEX The SIMATIC NET product meets the requirements o...

Page 35: ... currently valid IECEx certificates FM approval The product meets the requirements of the standards Factory Mutual Approval Standard Class Number 3611 FM Hazardous Classified Location Electrical Equipment Non Incendive Class I Division 2 Groups A B C D T4 and Non Incendive Class I Zone 2 Group IIC T4 cULus Approval for Information Technology Equipment cULus Listed I T E Underwriters Laboratories I...

Page 36: ...Approvals and certificates 8 1 Notes on the CE mark PROFIBUS Optical Bus Terminal OBT 36 Operating Instructions 04 2016 C79000 G8976 C122 07 ...

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