Omron NT631C manual CVM1 CVM1-CPU01-EV2, CVM1-CPU11-EV2 CVM1-CPU21-EV2 SRM1

Connecting to the Host’s RS-422A/485 Port				Section 5-2
PLC	CPU Unit with built-in Host	CPU Units Connectable with	Host Link Unit or		Connectable
Series	Link	Host Link Units or	Communications Board/		to
		Expansion Communications	Unit
		Board/Units
CV Series	CV500-CPU01-EV1	CV500-CPU01-EV1	CV500-LK201		CV500
(*3)	CV1000-CPU01-EV1	CV1000-CPU01-EV1			CV1000
	CV2000-CPU01-EV1	CV2000-CPU01-EV1			CV2000
CVM1	CVM1-CPU01-EV2	CVM1-CPU01-EV2	CV500-LK201		CVM1
Series (*3)	CVM1-CPU11-EV2	CVM1-CPU11-EV2
	CVM1-CPU21-EV2	CVM1-CPU21-EV2
SRM1	SRM1-C02-V1+CPM1-CIF11				SRM1

*1 This CPU Unit is for a Duplex-CPU Unit System. The CS1W-SCB41(-V1) Serial Communications Board cannot be used.

*2 Use a CPM2C-CN111 or CS1W-CN114/118 Connecting Cable, CPM1- CIF01 RS-232C Adapter, or CPM1-CIF11 RS-422A Adapter to connect.

*3 CPU Units of CVM1/CV-series PLCs without the suffix -EV@cannot be connected.

The host link method cannot be used when an NT631/NT631C is connected using RS-485. To use the host link method, connect by RS-422A.

Settings at the Host

When using the RS-422A host link method, the settings shown below must be made at the host (depending on the Unit, some of these settings may not be necessary, or settings not shown here may be necessary).

Item	Setting at Host
I/O port	RS-422A
Communications speed	Set the same speed as for the NT631/NT631C. (*1)
Transfer code	ASCII, 7 data bits, 2 stop bits
Parity	Even
1-to-1/1-to-N	1-to-N(*2)
Instruction level	Level 1, 2, 3
Unit #	00

*1

*2

Set the host link communications speed at 9600 bps or 19200 bps with the Comm. Speed memory switch at the NT631/NT631C. For details, refer to 6- 7-2 Setting the Host Link Method (page 155).

The 1-to-N setting enables BCC (Block Check Character). It is not actually possible to connect more than one NT631/NT631C in a single host link.

The setting methods for each type of Unit are described in the following.

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