Connecting The Network - GE ecomagination Profibus DP AF-650 GP Instruction Manual

2.1.5 Cable Routing
The PROFIBUS communication cable must be kept away from motor and brake resistor cables to avoid coupling of high frequency noise from one cable to the
other. Normally a distance of 8 in [200 mm] is sufficient, but maintaining the greatest possible distance between cables is generally recommended, especially
where cables run in parallel over long distances.
If the PROFIBUS cable must cross a motor cable or brake resistor cable, the cables must cross at an angle of 90°.

2.1.6 Connecting the Network

Proper termination of the network is essential. A mismatch of impedance
may result in reflections on the line that will corrupt data transmission.
- The Profibus DP Communications Module has a suitable termina-
tion, activated by switch 1 located on the Profibus option. The
switches must be on to terminate the network. The factory setting
is off.
- Nodes at the physical ends of each segment must be terminated.
- When power to the Profibus DP Communications Module is down,
please note that the termination is still active, although not func-
tional.
- Most masters and repeaters are equipped with their own termi-
nation.
- If an external termination circuit consisting of three resistors is
connected to the network, a 5 V DC power supply must be used.
Terminal 66 and 67 can be used for this.
- The CS pin on the Profibus connector is Control Select. When op-
tion goes into active state and sends a message, the CS pin goes
high (+5 Volts). This can be used to control optical transmitters etc.
or for triggering measurement equipment like an oscilloscope.
- D-sub 9 connector.
If desired, a D-sub 9 adaptor can be added as an option.
AF-650 GP/AF-600 FP Profibus DP Instruction Manual
Note: If the D-sub 9 adaptor is used, please be aware that the ter-
mination switch on the Profibus option is set to OFF, to avoid dou-
ble termination, as the Profibus D-sub 9 connector also features a
termination switch.
62 = RxD/TxD-P red cable (Siemens B)
63 = RxD/TxD-N green cable (Siemens A)
66 and 67 are for use with external terminator resistor only
DET-624
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