Omron SYSMAC CJ - REFERENCE MANUAL 08-2008 Reference Manual page 1081

Network Instructions
1) Normal End
CPU Unit
2) Error End
CPU Unit
An explicit message is sent and a normal response is returned.
The corresponding Explicit Communications Error Flag (A21300 to 07: Com-
munications port No. 0 to 7) will be OFF and the Network Communications
Response Code (A203 to A210: Communications port No. 0 to 7) will contain
the explicit message normal response code of 0000 hex.
PLC Rack
FINS header Explicit message
FINS header FINS response Explicit response
Communications Port
Enabled Flag
Explicit Message
Instruction
Explicit Communications
Error Flag
Communications Port
Error Flag
Communications Port
Completion Code
The are two possibilities for error ends, as described in the next two subsec-
tions.
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 Communica-
tions Error Flag (A21300 to A21307: Communications port No. 0 to 7) and the
Communications Port Error Flag (A21900 to A21907: Communications port
No. 0 to 7) will turn ON.
After completion, the Communications Port Completion Code (A203 to A210:
Communications port No. 0 to 7) will contain the FINS message error code.
PLC Rack
FINS header Explicit message
Explicit response
FINS header FINS response
FINS error response No explicit response
Explicit message sent
OK
CPU Bus
Explicit message
Unit
(e.g.,
OK
DeviceNet
Unit)
Explicit response
Normal explicit response
received
1
0
Instruction
being
executed
1
0
1
0
Previous 0000 hex 0000 hex
(normal end)
FINS error
Explicit message not sent
OK
CPU Bus
Unit
(e.g.,
Error
DeviceNet
Unit)
Network not running, etc.
Section 3-25
DeviceNet network
OK
OK
Processed normally
DeviceNet
node
(e.g., slave)
Instruction
being
executed
0000 hex
DeviceNet network
DeviceNet
(e.g., slave)
node
1041