GE Monogram GFK-1115 manual SNP Communications, Connecting Devices to the Bus

A

Connecting Devices to the Bus

Devices can be placed in any physical sequence on the bus, however, communications will be most efficient if devices are placed in the same sequence as their Device Numbers (Block Numbers).Each device has four terminals for the serial bus cable (Serial 1, Serial 2, Shield In, and Shield Out). Connect the Serial 1 terminal of each block to the Serial 1 terminals of the previous device and the next device. Connect the Serial 2 terminal of each block to the Serial 2 terminals of the previous device and the next device.

Shield In of each block must be connected to Shield Out of the preceding device. For the first device on the bus, Shield In can be left unconnected. For the last device on the bus, Shield Out can be left unconnected.

When making bus connections, the maximum exposed length of bare wires should be two inches. For added protection, each shield drain wire should be insulated with spaghetti tubing to prevent the Shield In and Shield Out wires from touching each other.

START

OF

BUS

TERMINATING

RESISTOR

SERIAL 1

SERIAL 2

SHIELD IN

SHIELD OUT

END	a40743
OF
BUS
	TERMINATING
	RESISTOR
	SERIAL 1
	SERIAL 2
	SHIELD IN
	SHIELD OUT

SNP Communications

To configure an SNP interface, refer to Appendix A (“Cabling Information”) in the PANELWARE™ MMI Application Manual fro GE Fanuc Series 90 Protocol (SNP) — GFK-0850. The specific information you will need is contained in the specifications and cabling diagrams for an RS-232 interface to IF0 and IF1 of the C200 Controller.

GFK-1115 Appendix A Cabling Information A - 5