Omron NT631C manual 112

Connecting to the Host’s RS-422A/485 Port Section 5-2

Using the High-speed NT Link (1:N) Method

2-wire or 4-wire selector (WIRE): 4	(4-wire = RS-422A), or
2	(2-wire = RS-485)

Terminating resistance switch (TERM): ON (terminator ON = terminating resistance enabled).

DM Area Allocation Settings

From the Programming Device (i.e., a Programming Console or CX-Program- mer), write the settings directly to the CPU Unit's DM Area Setup Area. After the settings have been written, they will be enabled when the power supply is cycled, the Unit is restarted, the communications port is restarted, or a STUP instruction is executed.

The DM Area words that are allocated and the contents of the settings are given in the following table.

m = DM 30000 + 100 ⋅ unit number

Allocated DM Area words		Setting	Setting Contents
Port 1	Port 2
m	m+10	8200	1:N NT Link Mode
m+1	m+11	0000 to 0009 (*1)	Baud rate (standard)
m+6	m+16	000@	@ = The highest unit number
			of the connected PTs (0 to
			7)

*1 Set any value between 0000 and 0009 hex for the baud rate. The same baud rate will be used regardless of the value as long as it is between 0000 and 0009 hex.

Compatible Host Units

Only OMRON’s CS/CJ-series PLCs support the high-speed 1:N NT Link through RS-422A/RS-485. The high-speed 1:N NT Link must be established through a Serial Communications Board/Unit. (Even CS/CJ-series Units with- out the “-V1” suffix can be connected via a high-speed 1:N NT Link by mount- ing a Serial Communications Board/Unit.)

Be sure to check the model number of the PLC and Board/Unit before trying to establish the high-speed 1:N NT Link.

The following table shows which CS-series PLCs can be connected to an NT631/NT631C with the high-speed 1:N NT Link through RS-422A/RS-485.

PLC	CPU Units with	CPU Unit that becomes	Model
Series	Built-in NT Link	connectable by installing a	Name
	(1:1) Function	Communications Board/Unit
CS		CS1G-CPU42/43/44/45-E(V1)(*1)	CS1G
Series		CS1H-CPU63/64/65/66/67-E(V1)(*1)	CS1H
		CS1G-CPU42H/43H/44H/45H(*1)	CS1D
		CS1H-CPU63H/64H/65H/66H/67H(*1)
		CS1D-CPU65H/67H(*2)
CJ		CJ1G-CPU44/45(*3)	CJ1G
Series		CJ1G-CPU42H/43H/44H/45H(*3)	CJ1H
		CJ1H-CPU65H/66H/67H(*3)	CJ1M
		CJ1M-CPU11/12/13/21/22/23(*3)

*1 A CS1W-SCB41(-V1) Serial Communications Board or CS1W-SCU31-V1 Serial Communications Unit is required.

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