Omron C200HW-CLK21, Operation Manual

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Introduction Section 6-1
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.
3. If the total number of data link words is increased, the communications cy-
cle time will be increased. This may cause timeout errors to occur when
waiting for the response. In that case, lengthen the response monitor time
(control data word C+4).
C200HX/HG/HE PLCs
SEND SEND transmits “n” words beginning with S (the beginning source word for
data transmission at the source node) to the “n” words beginning with D (the
beginning destination word for data reception at destination node N).
Note 1. When communicating in the same network with a CVM1 or CV-series PLC
manufactured prior to April 1996, the local network address cannot be set
Destination node N
"n" number
of send
words
n
S
15
0
n
D
15
0
Source node
C + 2
@SEND(90)
S
D
C
C
"n" number of send words
0000 to 03DE (Hex): 0 to 990 words
C +1 1
0: Operating level 1
1: Operating level 0
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): 0.1 to 25.4 s (unit: 0.1 s)
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
details on routing tables, refer to
S: Source node beginning send word
D: Destination node beginning receive word
C: Source node first control data word
15 14 0
1514131211
8 7
8 7
0
15 0
15 0
Direct/Indirect Direct/Indirect
0: Direct; 1: Indirect
Number of retries
0 to F (Hex): 0 to 15 retries
… …
(02 to 0F (Hex) are used when
using Controller Link Support
Boards for PCI Bus only.)
Section 7 Network Interconnections.