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Introduction Section 6-1
CQM1H-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.)
Note 1. When communicating in the same network with 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 executed. 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.
D: Destination node beginning receive word
C + 2
@SEND(90)
S
D
C
C
"n" number of send words
0000 to 03DE (Hex): 0 to 990 words
C +1 1
Always "1" for Controller
Link Networks
Always "1" for Controller Link Networks
0: Response required
1: Response not required
Destination node address (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.
0: Destination network address not specified (local network)
1: Destination network address specified.
Response monitor time
00 (Hex): 2 s (for 2 Mbps)
4 s (for 1 Mbps)
8 s (for 500 Kbps)
01 to FE (Hex):
FF (Hex): No response monitoring
Destination unit address
00 (Hex): PLC's CPU Unit
01 to 0F (Hex): Computer (user program)
10 to 1F (Hex): Unit Nos. 0 to 15
FE (Hex): Unit connected to network
C + 3 0 0
Destination network address
00 (Hex): Local network
01 to 7F (Hex): 1 to 127
This setting is enabled only when Destination network address specified" is set in word C.
When specifying a destination network address, set all the nodes in the routing tables. For de
tails on routing tables, refer to
S: Source node beginning send word
C: Source node first control data word
1514 0
1514131211 87
87
0
15 0
15 0
Direct/Indirect
0: Direct; 1: Indirect
Number of retries
0 to F (Hex): 0 to 15 retries
1
"n" number
of send
words
n
S
15
0
Source node
…
Destination node N
n
D
15 0
…
0.1 to 25.4 s (unit: 0.1 s)
(02 to 0F (Hex) are used
when using Controller Link
Support Boards for PCI
Bus only.)
Section 7 Network Interconnections.