921
3. Instructions
CS/CJ/NSJ Series Instructions Reference Manual (W474)
Network Instructions
3
Network Instructions
z Normal End
An explicit message is sent and a normal response is returned.
The corresponding Explicit Communications Error Flag (A213.00 to A213.07: Communications ports 0
to 7) will be OFF and the Communications Port Completion Code (A203 to A210: Communications
ports 0 to 7) will contain the explicit message normal completion code of 0000 hex.
Communications Flags
z Error End
There are two possibilities for error ends, as described in the next two subsections.
a) When the Explicit Message Could Not Be Sent
In this case, the explicit message was never sent on the network, e.g., because the network was not
running. Here, both the Explicit Communications Error Flag (A213.00 to A213.07: Communications
ports 0 to 7) and the Communications Port Error Flag (A219.00 to A219.07: Communications ports 0 to
7) will turn ON.
After completion, the Communications Port Completion Code (A203 to A210: Communications ports 0
to 7) will contain the FINS message error code.
OK
OK
OK
OK
CPU Unit
FINS header
FINS header FINS response Explicit response
Explicit response
CPU Bus
Unit
(e.g.,
DeviceNet
Unit)
Explicit message
Explicit message
Explicit message sent
Processed normally
Normal explicit response
received
PLC Rack
DeviceNet network
DeviceNet
node
(e.g., slave)
1
0
1
0
1
0
0000 hex
0000 hex
Communications Port
Enabled Flag
Explicit Message
Instruction
Explicit Communications
Error Flag
Communications Port
Error Flag
Communications Port
Completion Code
Instruction
being executed
Instruction
being executed
0000 hex
(normal end)
Previous
Explicit response
OK
FINS error
FINS error response No explicit response
CPU Unit
FINS header
FINS header FINS response
CPU Bus
Unit
(e.g.,
DeviceNet
Unit)
Explicit message
Explicit message not sent
Network not running, etc.
PLC Rack
DeviceNet network
DeviceNet
node
(e.g., slave)
Error
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