Omron CS1W-CLK12-V1, Руководство по эксплуатации

Страница: 132 / 312

115
Introduction Section 6-1
6-1-2 CMND
The CMND instruction can be executed in the user program in a CS-series,
CVM1, or CV-series PLC to perform operations such as reading and writing
memory data from and to other nodes, reading status information, and chang-
ing the operating mode.
CS-series PLCs CMND(490) sends “n” bytes of command data beginning with S (the begin-
ning word for storing command data at the local node) to remote node N. In
return, “m” bytes of response data are stored at the local node beginning with
D (the beginning word for storing response data).
Note With the message service, there is no guarantee that a message to a remote
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 message
service, it is advisable to prevent this situation from occurring by performing
CMND(490)
S
D
C
"n" bytes
of com
mand
data
"m" bytes
of
response
data
S
15 0
S: Beginning command storage word
D: Beginning response storage word
C: Beginning control data word
Local node
Remote (source) node N
(S
−
1)
+
n
2
D
(D
−
1)
+m
2
Command
Response
Analysis
Execution
Remote node N
00 to 3E (Hex): 0 to 62 (*1)
The same data can be broadcast to all nodes
on the network by setting the remote node address to
FF (Hex).
The range of node addresses will vary for networks
other than Controller Link Networks.
C+1
C+4 0 0
Number of retries
0 to F (Hex): 0 to 15 retries
0: Response required
1: Response not required
C
"n" bytes of command data
0000 to 07C6 (Hex): 0 to 1,990 words
0
"m" bytes of response data
0000 to 07C6 (Hex): 0 to 1,990 words
15 0
C+3
15 8 7 0
Remote unit address
00 (Hex):
PLC's CPU Unit
01 (Hex): Computer (user program)
10 to 1F (Hex): Unit nos. 0 to 15
E1 (Hex):
Inner Board
FE (Hex): Unit connected to network
15 11 8 7 3 0
15 10 8 7 3 0
Response monitor time
0000 (Hex): 2 s
0001 to FFFF (Hex): 0.1 to 6,553.5 s (Unit: 0.1 s)
If the transmission speed 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.
C+2 0 0
15 11 8 7 0
Remote network address
00 (Hex): Local network
01 to 7F (Hex): 1 to 127
C+5
15
*1 Only node addresses 1 to 32 can be specified when Optical Bus Controller Link Units/Boards (CLK11)
are combined in a network with Optical Ring Controller Link Units/Boards operating in token-bus mode.
Communications port No.
0 to 7 (Hex)
• • •
• • • • • •