Omron CS1W-ETN21 operation manual CMND490, Hex 2 s Destination node number N To FE Hex

Communicating between OMRON PLCs Section 6-6

CMND(490)

(@)CMND(490)

S

D

C

The CMND(490) instruction sends n bytes of command data, starting from the beginning word S at the local node, to the node at node address N. the data in m number of words, starting from the beginning word S at the remote node (node address M) is received at the words starting from the beginning word D at the local node.

Local node Destination node number N

150

S

				Comm	a	nd
			Com-			Interpretation
			mand
	−	1)	data: n
(Sn
−			bytes
+2

	Respon	se
D		Execution
	Re-
	sponse
(D−1)	data: m
m	bytes
+−
2

S:Beginning command storage word

D:Beginning response storage word

C:First word of control data (below)

15 0

C

Number of bytes of command data (n) 0000 to 07C6 (Hex): 1 to 1,990 bytes

15 0

C+1

Number of bytes of response data (m) 0000 to 07C6 (Hex): 1 to 1,990 bytes

	15	11	8 7		0		15	10	8 7	3	0
C+2	0		0				C+4	0		0
				Destination network number							Number of retries
				00 (Hex):		Local network					0 to F (Hex): 0 to 15 retries
									Communications port number: 0 to 7
				01 to 7F (Hex): 1 to 127
	15		8 7		0			Response
C+3
								0: Required.
				Destination Unit address				1: Not required.
				00 (Hex):		CPU Unit	15	10	8 7	3	0
				10 to 1F: (Hex): Unit #0 to #15			C+5
				E1 (Hex):		Inner Board
				FE (Hex):		Unit connected to network				Response monitor time

0000 (Hex): 2 s

Destination node number N

00 to FE (Hex): 0 to 254

The same data can be broadcast to all nodes on the network by setting the destination node number to FF (Hex).

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

The range of node addresses is different for networks other than Ethernet.

Note The message services function does not guarantee that a message will reach the destination node. A message may be lost during transmission due to fac- tors such as noise. In order to prevent this from occurring when using mes- sage services, it is common to set up retry processing at the node from which instructions are issued. With the SEND(090), RECV(098), and CMND(490) instructions, retry processing is executed automatically by specifying the num- ber of retries, so specify a number other than 0.

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