Omron CQM1H-CLK21, CVM1-CLK21, CS1W-RPT01, CJ1W-CLK21-V1, C200HW-CLK21, CS1W-CLK21-V1 179

IntroductionSection 6-1

6-1-2 CMND (CVM1, CV-series, CS/CJ-series, and CQM1H-series PLCs Only)

The CMND instruction can be executed in the user program in a CVM1, CV- series, CS/CJ-series, or CQM1H-series PLC to perform operations such as reading and writing memory data from and to other nodes, reading status information, and changing the operating mode.

CS/CJ-series PLCs	CMND sends “n” bytes of command data beginning with S (the beginning
	send word for storing command data at the source node) to destination node
	N. In return, “m” bytes of response data are stored at the source node begin-
	ning with D (the beginning receive word for storing response data).
			Source node			Destination node N
	15			0
	S					Command
					"n" bytes	Analysis
					of com-
	(S –1)				mand
			…	…	data
		n
	+ 2

Response

CMND(490) D

SS: Source node beginning send word

D	D: Destination node beginning receive word	(D –1)
	C: Source node first control data word
C		+	m
			2

…

"m" bytes	Execution
of
response
data

15 0

C

"n" bytes of command data

0000 to 07C6 (Hex): 0 to 1,990 words

15 0

C+1

"m" bytes of response data

0000 to 07C6 (Hex): 0 to 1,990 words

	15	11	8 7	0
C+2	0		0	C+4

15		11	8 7	3	0
	0			0

Destination network address 00 (Hex): Local network

01 to 7F (Hex): 1 to 127

15	8 7	0
C+3
	Destination unit address
	00 (Hex):	PLC's CPU Unit
	01 to 0F (Hex): Computer (user program)
		(02 to 0F (Hex) are used C+5
		when using Controller
		Link Support Boards for
		PCI Bus only.)
	10 to 1F (Hex): Unit nos. 0 to 15
	E1 (Hex):	Inner Board
	FE (Hex):	Unit connected to network

Destination node N

00 to 20 (Hex): 0 to 32 (or 00 to 3E (Hex): 0 to 62)

The same data can be broadcast to all nodes

on the network by setting the destination node address to FF (Hex).

The range of node addresses will vary for networks other than Controller Link Networks.

Number of retries

0 to F (Hex): 0 to 15 retries

Communications port number: 0 to 7 (Hex)

0:Response required

1:Response not required

15 10 8 7 3 0

Response monitor time 0000 (Hex): 2 s

0001 to FFFF (Hex): 0.1 to 6,553.5 s

(Unit: 0.1 s)

If the baud rate is slow, then setting a small value may generate an error. The standard is approximately 4 seconds at 1 Mbps or 8 seconds at 500 Kbps.

Note With the message service, there is no guarantee that a message to a destina- tion node will reach its destination. It is always possible that the message may be lost in transit due to noise or some other condition. When using the mes-

179