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Communicating between OMRON PLCs Section 8-6
8-6-3 Using SEND(090), RECV(098), and CMND(490)
Make the settings shown below when using the SEND(090), RECV(098), and
CMND(490) instructions in the user’s ladder-diagram program in the PC.
SEND(090) The SEND(090) instruction sends the data in n number of words, starting from
the beginning word S at the local node, to the words starting from the begin-
ning word D at the remote destination node (node address N).
Note The message service does not guarantee that a message will reach the desti-
nation node. A message may be lost during transmission due to factors such
as noise. To prevent this from occurring when using message 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 number of retries, so
specify a number other than 0.
S→
15
0
n
D→
15
0
Local node
Number
of words
(n)
Destination node number N
(@)SEND(90)
S
D
C
C+1 0 0
C
15 11 8 7 0
C+2
15 11 8 7 0
15 0
C+3 0 0
C+4
15 10 8 7 3 0
S: Local node beginning word
D: Destination beginning word
C: First word of control data (below)
Number of words (n)
0001 to 03DE (Hex): 1 to 990 words
Destination network number
00 (Hex): Local network
01 to 7F (Hex): 1 to 127
Destination unit address
00 (Hex): CPU Unit
10 to 1F: (Hex): Unit #0 to #15
E1 (Hex): Inner Board
FE (Hex): Unit connected to network
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).
The range of node addresses is different for networks other than Ethernet.
Number of retries
0 to F (Hex): 0 to 15 retries
Communications port number: 0 to 7
Response
0: Required.
1: Not required.
Response monitor time
0000 (Hex): 2 s
0001 to FFFF (Hex): 0.1 to 6,553.5 s
(in units of 0.1 s)