Omron CQM1H-CLK21, CVM1-CLK21, CS1W-RPT01, CJ1W-CLK21-V1 Section CVM1 and CV-series PLCs

Introduction	Section 6-1
CVM1 and CV-series PLCs
SEND	SEND transmits “n” words beginning with S (the beginning word for data
	transmission at the source node) to “n” words beginning with D (the beginning
	word for data reception at the destination node, N.)

	Source node
15	0

S"n" number

…of send words

n

Destination node N

150

D

… n

(↑ )SEND(192)

S

D

C

S: Source node beginning send word

D:Destination node beginning receive word

C:Source node first control data word

15	0		15		10	8 7	3	0
C		C+3		0			0

		"n" number of send words								Number of retries
		0001 to 03DE (Hex): 1 to 990 words								0 to F (Hex): 0 to 15 retries
15		11	8 7		0				Communication port No.
C+1	0		0						0 to 7
								0: Response required
				Destination network address				1: Response not required
				00 (Hex):		Local network
				01 to 7F (Hex): 1 to 127
15		11	8 7		0
C+2							C+4

Destination unit address

00 (Hex): PLC's CPU Unit

01 to 0F (Hex): Computer (user program)

(02 to 0F (Hex) are used 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

01 to 20 (Hex): 1 to 32 (or 01 to 3E (Hex): 1 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.

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 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- curring by performing resend processing at the node where instructions are issued. With the SEND, RECV, and CMND instructions, resend pro- cessing is performed automatically once the number of retries has been set, so be sure to specify a number other than “0” for the number of retries.

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