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Functional Description

3-3

PROFIBUS Optical Bus Terminal (OBT)
C79000-G8976-C122-03

L+ 24V (green)

Unlit:

No power supply or internal power supply is
defective or short-circuited

Flashes:

Power supply present; Transmission rate
not yet set

Lit green:

Transmission rate set, power supply
O.K.

CH1, CH2 , CH3 (channel 1 to 3, yellow)

Unlit:

No data being received

Lit yellow:

Data being received

L + 24V

CH1

CH2

CH3

CH2

CH3

Figure 3-1

LED Displays on the Front Panel

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Summary of Contents for SIMATIC NET PROFIBUS OBT

Page 1: ...uct 2 Functional Description 3 Network Topology 4 Installation and Startup 5 Troubleshooting 6 Technical Specifications 7 Notes on the CE Label 8 References 9 Abbreviations 10 Release 2 C79000 G8976 C122 03 PROFIBUS Optical Bus Terminal OBT Manual SIMATIC NET ...

Page 2: ...ly and operated and maintained as recommended Trademarks SIMATIC SIMATIC HMI and SIMATIC NET are registered trademarks of SIEMENS AG Third parties using for their own purposes any other names in this document which refer to trademarks might infringe upon the rights of the trademark owners Safety Guidelines This manual contains notices which you should observe to ensure your own personal safety as ...

Page 3: ...omatic Transmission Rate Detection 3 2 3 4 Supported FO Fiber Types 3 2 3 5 Displays 3 2 3 6 Operator Controls 3 4 4 Network Topology 4 1 4 1 Optical Bus 4 1 4 2 Using Long Fiber Optic Sections 4 2 4 3 Attaching RS 485 Segments 4 3 5 Installation and Startup 5 1 5 1 Precedure for Installation 5 2 5 2 Installation 5 3 6 Troubleshooting 6 1 7 Technical Specifications 7 1 8 Notes on the CE Label 8 1 ...

Page 4: ...Contents ii PROFIBUS Optical Bus Terminal OBT C79000 G8976 C122 03 Contents ...

Page 5: ...egrated optical interface to the optical PROFIBUS DP The following figure illustrates a typical configuration 1 PROFIBUS cable terminated at both ends 2 Plastic FO cable or PCF FO cable with two fibers PC Programming Device Operator Panel SIMATIC S7 400 with IM 467 FO ET 200M with FO interface DP node without FO interface 2 1 2 2 1 OBT OBT À À À À À Terminating resistor activted Figure 1 1 Example...

Page 6: ... differences in potential as can occur in extensive systems have no effect 1 HCS is a registered trademark of Ensign Bickford Optics Company and stands for Hard Polymer Cladded Silica Fiber Sensitivity Just as fiber optic cable is insensitive to electromagnetic noise a fiber optic cable emits no electromagnetic noise into the environment Sensitive electronic devices close to the fiber optic cable ...

Page 7: ...FIBUS OBT Product Supplied 1 x PROFIBUS OBT 1 x order form for the PROFIBUS OBT operating instructions Not supplied Plastic fiber optic cable can be purchased by the meter Tools for connectoring fiber optic cables PROFIBUS OBT operating instructions Fiber optic cable connectors 2 ...

Page 8: ...The SIMATIC NET PROFIBUS OBT Product 2 2 PROFIBUS Optical Bus Terminal OBT C79000 G8976 C122 03 ...

Page 9: ...le with two simplex connectors is connected to each of these duplex sockets The OBT also has a block with three terminals for connecting the 24 V power supply and if necessary a grounding conductor 3 2 Optoelectric Signal Conversion and Signal Regeneration The OBT converts the RS 485 level signal received at channel 1 into an optical signal level that is then output via channel 2 and channel 3 Sig...

Page 10: ... to 50 m PCF FO 200 230 µm with 2 fibers and max 10 dB km cable attenuation 0 m to 300 m The specified distances between the devices assume that the partner devices use the same optical components as the OBT This is for example the case with the IM 153 2 FO IM 467 FO and OLM 12M The transmission rate is independent of the type of fiber used and the cable length It can be up to 12 Mbps The followin...

Page 11: ...ternal power supply is defective or short circuited Flashes Power supply present Transmission rate not yet set Lit green Transmission rate set power supply O K CH1 CH2 CH3 channel 1 to 3 yellow Unlit No data being received Lit yellow Data being received L 24V CH1 CH2 CH3 CH2 CH3 Figure 3 1 LED Displays on the Front Panel ...

Page 12: ...Optical Bus Terminal OBT C79000 G8976 C122 03 3 6 Operator Controls The OBT itself does not have operator controls Care must simply be taken that the PROFIBUS connecting cable not supplied attached to Channel 1 is terminated at both ends ...

Page 13: ...ith the rubber plug supplied This prevents contamination of the optical elements and disturbances caused by light entering the module The connection forming the optical bus is a two fiber plastic FO cable maximum length 50 m or PCF FO cable maximum length 300 m The fiber optic cables have two simplex connectors at each end The fiber optic connection between two devices is established by connecting...

Page 14: ...example OBT CH 1 to OLM CH 1 and the OLM is attached to the long fiber optic section At the other end of the fiber optic section the arrangement is reversed by another OLM OBT pair PC PG OP SIMATIC S7 400 with IM 467 FO ET 200M with FO interface 1 PROFIBUS cable terminated at both ends 2 Plastic FO cable or PCF FO cable with two fibers 3 FO cable for long distances À Terminating resistor activted ...

Page 15: ... PROFIBUS cable terminated at both ends 2 PROFIBUS cable 3 PROFIBUS connector not terminated 4 Plastic FO or PCF FO with two fibers ET 200M without FO interface DP node without FO interface SIMATIC S7 400 with IM 467 ET 200M without FO interface À Terminating resistor activted 2 2 2 3 4 4 1 1 OBT OBT OBT À À À À À À 3 Figure 4 2 Example of Attaching RS 485 Segments ...

Page 16: ...Network Topology 4 4 PROFIBUS Optical Bus Terminal OBT C79000 G8976 C122 03 ...

Page 17: ...ELV complying with IEC 950 EN 60 950 VDE 0805 with a maximum of 32 V typically 24 V The power source must comply with the regulations of NEC class 2 according to the UL CSA approval Note Do not look directly into the opening of the optical transmitter diode The emitted light could injure your eyes Danger Never connect the PROFIBUS OBT to a power supply of 110 V 240 V Note Select the installation l...

Page 18: ... sure that the PROFIBUS OBT is adequately grounded by connecting the rail or mounting plate to local ground with low resistance and low inductance Note As the RS 485 cable use only LAN cables approved for PROFIBUS Note Do not open the OBT casing 5 1 Precedure for Installation Installation of the PROFIBUS OBT involves the following steps Installing the PROFIBUS OBT Connecting the power supply Conne...

Page 19: ...nough space for connecting the bus and power supply cables Install the modules only on a low resistance and low inductance grounded standard rail or mounting plate If you secure the modules on a mounting plate make sure that as short a cable as possible leads from the ground terminal of the OBT to the nearest possible ground point Installation on a Standard rail Fit the upper catch of the module o...

Page 20: ...nting plate as shown in the drill template in Figure 5 2 Secure the modules with machine screws for example M3 x 75 and M3 x 55 Use a grounding conductor with at least 2 5 mm2 to establish a reliable electrical connection between the PE terminal of the module casing and the grounded mounting plate CH1 SIMATIC NET PROFIBUS Optical Bus Terminal 6GK1500 3AA00 1 2 3 4 5 6 7 L 24V CH1 CH2 CH3 CH2 CH3 P...

Page 21: ...inal PE and Power Supply Terminals M L The power supply for the PROFIBUS OBT must be a stabilized safety extra low voltage complying with IEC 950 VDE 0805 minimum 18 V and maximum 32 V typically 24 V The power source must meet the specifications of NEC class 2 to comply with the UL CSA approval The unit is intended to be installed on the load side of the class 2 or class 3 power source as defined ...

Page 22: ... an optical output crossover Make sure that there is reliable strain relief for the FO cable and do not bend the cable beyond the minimum bending radius Close unused FO sockets with the plastic plugs provided Extraneous light particularly when it is extremely bright can cause disturbances on the PROFIBUS network Remember the minimum and maximum length of the FO cable and the permitted fiber types ...

Page 23: ...The maximum cable length between the OBT and DTE is 100 m Since this involves a point to point connection the terminating resistors in the PROFIBUS connectors must be activated at both ends of the cable Use only SIMATIC NET shielded Twisted Pair cables as the RS 485 cable for PROFIBUS Do not connect RS 485 cables when all or part of the cable is outside a building Lightning in the area can otherwi...

Page 24: ...Installation and Startup 5 8 PROFIBUS Optical Bus Terminal OBT C79000 G8976 C122 03 ...

Page 25: ...the RS 485 LAN cable and wires A and B con nected to wrong terminals No or wrong termination CH2 CH3 LED not lit Send and receive FO cords swapped over Break on FO cord receiving receiving from partner module No partner module connected or partner module is not turned on Attached partner module is defective not sending CH2 CH3 LED lit But PROFIBUS nodes signa ling bus problems FO connector is loos...

Page 26: ...Troubleshooting 6 2 PROFIBUS Optical Bus Terminal OBT C79000 G8976 C122 03 ...

Page 27: ...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 delay time any input output 6 tBit Cascading depth of optical bus limited only by signal run time Electrical channel Input output signal RS 485 level Input dielectric strength 7 V to 12 V Minimum current at 5V for terminating resistors 10 mA Electrical isolatio...

Page 28: ...shield connection and casing 6 kV contact di scharge IEC 1000 4 2 Immunity to high frequency interference 10 V m at 80 amplitude modulation at 1kHz 80MHz 1GHz ENV 50140 IEC 61000 4 3 10V m at 50 on time at 900MHz ENV 50 204 10 V m at 80 amplitude modulation at 1kHz 10kHz 80MHz ENV 50141 Immunity to conducted interference burst On power supply cables and shielded RS 485 LAN cables 2 kV IEC 61000 4 ...

Page 29: ...cal conditions Vibration during operation 10 to 58 Hz 0 075 mm deflection 58 to 150 Hz 10m s2 1g acceleration IEC 68 2 6 Vibration during transportation 5 to 9 Hz 3 5 mm deflection 9 to 500 Hz 10m s2 1g acceleration Type of protection with external fusing 8A IP 30 Weight 400 g Dimensions 50 5 x 138 x 78 mm Casing material Noryle anthracite ...

Page 30: ...Technical Specifications 7 4 PROFIBUS Optical Bus Terminal OBT C79000 G8976 C122 03 ...

Page 31: ...mens Aktiengesellschaft Bereich Automatisierungstechnik Industrielle Kommunikation A D PT2 Postfach 4848 D 90327 Nürnberg Germany Installation Instructions The product meets the requirements above when it is installed and operated according to the instructions in the Optical Bus Terminal PROFIBUS OBT documentation The accessible radiated power of the transmitting LEDs used complies with class 1 EN...

Page 32: ...n machines we are obliged to point out that this product is intended solely for installation in a machine Before the final product can be put into operation it must be tested for compliance with the directive 89 392 EEC Notes for Australia SIMATIC NET OBT meets the requirements of AS NZS 2064 Class A standard ...

Page 33: ... for electrical characteristics of generators and receivers for use in balanced digital multipoint systems 6 SIMATIC NET Manual for PROFIBUS Networks SIEMENS AG order number 6GK19705AC10 0BA0 7 SIMATIC NET Industrial Communication Catalog IK10 SIEMENS AG Bereich Automatisierungstechnik Geschäftszweig Industrielle Kommunikation SIMATIC NET Postfach 4848 D 90327 Nürnberg Germany 8 SIMATIC NET Produc...

Page 34: ...References 9 2 PROFIBUS Optical Bus Terminal OBT C79000 G8976 C122 03 ...

Page 35: ...a registered trademark of Ensign Bickford Optics Company and stands for Hard Polymer Cladded Silica Fiber In these instructions only the general term PCF is used LAN Local Area Network LED Light Emitting Diode OBT Optical Bus Terminal OLM Optical Link Module PCF Polymer Cladded Fiber synonymous with HCS fiber POF Polymer Optical Fiber synonymous with plastic FO cable PROFIBUS DP PROFIBUS Distribut...

Page 36: ...Abbreviations 10 2 PROFIBUS Optical Bus Terminal OBT C79000 G8976 C122 03 ...

Page 37: ... _ _ _ _ _ Country _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Phone _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Please check any industry that applies to you r Automotive r Chemical r Electrical Machinery r Food r Instrument and Control r Nonelectrical Machinery r Petrochemical r Pharmaceutical r Plastic r Pulp and Paper r Textiles r Transportation r Other _ _ _ _ _ _ _ _ _ _ _ 1 ...

Page 38: ... _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Remarks Form Your comments and recommendations will help us to improve the quality and usefulness...

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