Omron CS1W-CLK12-V1, Operation Manual

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123
Using the Message Service Section 6-3
CVM1 and CV-series PLCs
Network Status
The nodes on the network are shown in the following illustrations.
CS-series, CVM1, and CV-series PLCs
Communications Flag Operations
• The Network Instruction Enabled Flag turns OFF during transmission or
reception, and ON after the data transmission or reception has been com-
pleted (regardless of whether an error occurs).
• The Network Instruction Error Flag retains its status until the next data
transmission or reception.
• Even when there is an abnormal end, the Network Instruction Error Flag
turns OFF when the next communications instruction is executed.
Example
Name Address Contents
Word Bit
Network
Instruction
Enabled Flag A502 Port number corresponds
to bit number, i.e., port 0:
bit 00, port 1, bit 00, etc. 0: Execution not enabled (executing)
1: Execution enabled (not executing)
Network
Instruction
Error Flag A502 Port number corresponds
to bit number plus 8, i.e.,
port 0: bit 08, port 1, bit 09,
etc. 0: Normal end
1: Abnormal end
*1 When Optical Bus Controller Link Units/Boards (CLK11) are combined in a
network with Optical Ring Controller Link Units/Boards in token-bus mode,
only node addresses 1 to 32 are checked for their participation status.
N: Unit number -: Not used
0: Not participating in network.
1: Participating in network.
(The numbers in the grid are the node numbers for the corresponding bit.)
Network Instruction Enabled Flag
Communications instruction
(SEND/RECV/CMND)
Network Instruction Error Flag
Communications instruction response code
Instruction 2
being executed Instruction 3
being executed
Previous
end
1
0
1
0
Instruction 1
being executed
00 00 00 00 04
00
(Normal
end) (Normal
end)
(Busy)