Omron CS1W-RPT01, CVM1-CLK21, CJ1W-CLK21-V1 Beginning word for storing response data, Cmnd

Introduction					Section 6-1
CQM1H-series PLCs	CMND sends “n” bytes of command data beginning with S (the beginning
	word for storing command data at the source node) to node N. In return, “m”
	bytes of response data are stored at the source node beginning with D (the
	beginning 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

	D	…
	(D –1)
CMND	+m
	2

SS: Source node beginning send word

DD: Destination node beginning receive word

C: Source node first control data word

C

"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		10	8 7	3	0
	0	0		0

Number of retries

Destination network address0 to F (Hex): 0 to 15 retries

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
	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.

0:Response required

1:Response not required

15 10 8 7 3 0

Response monitor time

0000 (Hex): 2 s at 2 Mbits/s

4 s at 1 Mbit/s

8 s at 500 kbits/s

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

(Unit: 0.1 s)

Note 1. When using CVM1 and CV-series PLCs manufactured prior to April 1996, the local network address cannot be set to “00.” Set a number other than “00” as the local network address in the routing tables, and then specify that number.

2.With the message service, there is no guarantee that a message to a des- tination node will reach its destination. It is always possible that the mes- sage may be lost in transit due to noise or some other condition. When using the message service, it is advisable to prevent this situation from oc-

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