Omron CS1W-CLK21-V1, CVM1-CLK21, CS1W-RPT01, CJ1W-CLK21-V1, C200HW-CLK21, CQM1H-CLK21 168

Introduction Section 6-1

RECV

@RECV(98)

S

D

C

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.

RECV receives “m” words beginning with S (the beginning word for data transmission at the destination node, M) to the words beginning with D (the beginning word for data reception at the source node).

	Source node		Destination node M
15		0	15	0
D			S
			"m" num-
m		…	ber of	…
			send

words

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

		"m" number of send words							Number of retries
		0000 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
	10 to 1F (Hex):	only.)
		Unit nos. 0 to 15
	E1 (Hex):	Inner Board
Destination node M	FE (Hex):	Unit connected to network

01 to 20 (Hex): 1 to 32 (or 01 to 3E (Hex): 1 to 62)

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 communicating with a CVM1 or CV-series PLC manufactured prior to April 1996 on the local network, 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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