Omron CS1W-ETN21 operation manual Flag name Address Contents Word Bits

Communicating between OMRON PLCs Section 6-6

Execution	Communications	C
condition	Port Enabled Flag
		KEEP(011) A
Reset B
A
		Operand,
		control data
		created with
		@MOV and
		@XFER.
		Communications
		instructions
		@SEND
		@RECV
		@CMND
	Communications
A	Port Enabled Flag
		DIFU(013) B
A	Communications
	Port Error Flag
Execution	Communications
condition	Port Enabled Flag	A
		KEEP(011) C
Reset D
	(Continued in same way.)

Input A remains ON from start to completion of commu- nications instruction.

Creates operand and control data in a given area.

Executes communications instructions.

Creates reset input. (Turns reset B ON after execution of communications in- struction.)

Send Error Flag display (Retry can be executed.)

Exclusive control so execution is not simultaneous.

Use exclusive control so that no other communica- tions instructions are started before execution of the above communications instruction is complete.

The execution status of the SEND(090), RECV(098), and CMND(490) instruc- tions is always reflected by the communications flags (i.e., the Communica- tions Port Enabled Flag and the Communications Port Error Flag). The CS/ CJ-series CPU Unit’s communications flags are allocated in the Auxiliary Area as shown in the following table.

Flag name		Address	Contents
	Word	Bits
Communications Port	A202	Bit 7: Port 7	OFF: Execution enabled
Enabled Flag		Bit 6: Port 6	(being executed)
		Bit 5: Port 5	ON: Execution disabled
		Bit 4: Port 4
			(not being executed)
		Bit 3: Port 3
		Bit 2: Port 2
		Bit 1: Port 1
		Bit 0: Port 0
Communications Port	A219	Bit 7: Port 7	0: Normal completion
Error Flag		Bit 6: Port 6	1: Abnormal completion
		Bit 5: Port 5
		Bit 4: Port 4
		Bit 3: Port 3
		Bit 2: Port 2
		Bit 1: Port 1
		Bit 0: Port 0

Note With CS/CJ-series PLCs, communications ports 0 to 7 are also used for exe- cuting the PCMR(260) (PROTOCOL MACRO) instruction, so these flags are used in common for SEND(090), RECV(098), CMND(490), and PCMR(260). While PCMR(260) is being executed, SEND(090), RECV(098), and CMND(490) cannot be executed at the same communications port.

142