Omron SYSMAC CS1W-CLK11 Operation Manual page 139

Introduction
CMND
S
S: Source node beginning send word
D: Destination node beginning receive word
D
C: Source node first control data word
C
15
C
"n" bytes of command data
0000 to 07C6 (Hex): 0 to 1,990 words
15
C+1
"m" bytes of response data
0000 to 07C6 (Hex): 0 to 1,990 words
15 11
C+2 0 0
15
C+3
Destination unit address
00 (Hex):
01 (Hex):
10 to 1F (Hex): Unit nos. 0 to 15
E1 (Hex):
FE (Hex):
Destination node N
00 to 20 (Hex): 0 to 32
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.
N. In return, "m" bytes of response data are stored at the source node begin-
ning with D (the beginning receive word for storing response data).
0
0
8 7 0
Destination network address
00 (Hex): Local network
01 to 7F (Hex): 1 to 127
8 7 0
PC's CPU Unit
Computer (user program)
Inner Board
Unit connected to network
Note With the message service, there is no guarantee that a message to a destina-
tion node will reach its destination. It is always possible that the message may
be lost in transit due to noise or some other condition. When using the mes-
sage service, it is advisable to prevent this situation from occurring by per-
forming resend processing at the node where instructions are issued. With
the SEND, RECV, and CMND instructions, resend processing 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.
Source node
15 0
S
"n" bytes
of com-
mand
(S –1)
data
n
+
2
D
"m" bytes
of
response
data
(D –1)
m
+
2
15 10 8 7 3
C+4 0 0 0
Number of retries
0 to F (Hex): 0 to 15 retries
0: Response required
1: Response not required
15 10 8 7 3
C+5
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.
Section 6-1
Destination node N
Command
Analysis
Response
Execution
0
0
123