Saturday, June 19, 2010

Connecting SOI-120 & SOI-260 to the GE Fanuc PLC





The SOI may be connected to the GE Fanuc PLC via the programming port or one of the SNP capable ports in an optional GE Fanuc Communications Coprocessor Module, Contact spectrum controls for information on interfacing to the CMM using Modbus protocol.
GE Fanuc Communications Port DB15
series 90-30 CMM 311 Port 2 DB25
The PLC communication port receive data differential pair must be terminated as indicated if the PLC is either the first or last drop on the SNP bus. This always the case in the point-to-point configuration. However, PLCs may be connected as multiple drops. Do not connect the termination resistor if the PLC is not the first or last drop on the SNP bus.

Shield Ground
The shield must be grounded at the first drop on the SNP bus. If the SOI is the first drop on the bus, connect the SOI communication port pin 5 and 9. If the PLC is the first drop on the bus, connect pins 1 and 7 on the PLC port. Do not connect the shield to ground on more than one unit (PLC or SOI) on the SNP bus. SOI Resistor termination.

The SOI communication port receive data differential pair must be terminated as indicated if the SOI either the first or last drop on the SNP bus. Do not connect the termination resistor if the SOI is not the first or last drop on the SNP bus. The SOI will only connect to and communicate with one PLC regardless of how many are attached to the SNP bus.


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