Omron CJ1W-DRM21 Installing the DeviceNet Unit, System Configuration Precautions, Connectors

Installing the DeviceNet Unit Section 2-2

Continue/Stop Remote I/O Communications

When the DeviceNet Unit is used as a master, pin 3 is used to set whether or not communications will stop after a communications error.

	Pin 3		Function
	OFF	Continue communications.
	ON	Stop communications.
	If pin 3 is ON, remote I/O communications will be stopped if one of the follow-
	ing errors occurs.
	Remote I/O Communications Error Flag (n+12, bit 02 is ON)
	Send Timeout Flag (n+10, bit 08 is ON)
	Network Power Error Flag (n+10, bit 07 is ON)
	Remote I/O communications will remain stopped even if the error is cleared.
	(Message communications and slave functions will continue.) To resume com-
	munications, turn ON the Remote I/O Communications Start Bit (word n, bit
	02) of Software Switches 1. Refer to 3-2 Allocated CIO Area Words for details.
Note	The 7-segment display will show “A0” when remote I/O communications stop.
	Refer to SECTION 9 Troubleshooting and Maintenance.
	If pin 3 is OFF, remote I/O communications will stop if a send timeout or net-
	work power error occurs, but will restart automatically when the cause of the
	error is cleared.
	Hold/Clear Remote Outputs
	When the DeviceNet Unit is used as a slave, pin 4 is used to set whether to
	hold or clear remote outputs when a communications error occurs.
Note	If the DeviceNet Unit is used as a slave, the 7-segment display will show “L9”
	when remote I/O communications stop. Refer to SECTION 9 Troubleshooting
	and Maintenance.
Communications	Color stickers that match communications cable colors are attached to the
Connectors	communications connectors. Match the colors when connecting communica-
	tions cables to the connectors. These colors are given in the following table
		Color		Signal
	Black			Power line, negative voltage (V–)
	Blue			Communications line, low (CAN L)
	---			Shield
	White			Communications line, high (CAN H)
	Red			Power line, positive voltage (V+)

For details on communications specifications and wiring, refer to DeviceNet (CompoBus/D) Operation Manual (W267).

Note Before connecting communications cables, turn OFF the PC power supply, all slave power supplies, and the communications power supply.

2-2 Installing the DeviceNet Unit

2-2-1 System Configuration Precautions

•I/O words are allocated to CPU Bus Units according to the unit number setting on the switch located on the front panel of the Unit, not according to Unit slot numbers. Refer to 3-1 Overview of Word Allocations.

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