Omron SYSMAC CJ - REFERENCE MANUAL 08-2008 Reference Manual page 1082

Network Instructions
CPU Unit
1042
Communications Port
Enabled Flag
Explicit Message
Instruction
Explicit Communications
Error Flag
Communications Port
Error Flag
Communications Port
Completion Code
b) When the Explicit Message Was Sent But an Explicit Error Response
Was Returned
In this case, the explicit message was sent but an error existed in the explicit
message command frame (code not supported, illegal size, etc.). Here, the
Explicit Communications Error Flag (A21300 to 07: Communications port No.
0 to 7) will turn ON and the Network Communications Error Flag (A21900 to
07: Communications port No. 0 to 7) will remain OFF.
After completion, the Network Communications Response Code (A203 to
A210: Communications port No. 0 to 7) will contain the explicit message error
code.
PLC Rack
FINS header Explicit message
Explicit error
FINS header FINS response
response
Communications Port
Enabled Flag
Explicit Message
Instruction
Explicit Communications
Error Flag
Communications Port
Error Flag
Communications Port
Completion Code
1
0
Instruction
being
executed
1
0
1
0
Previous 0000 hex FINS end code
Explicit message sent
OK
CPU Bus
Explicit message
Unit
(e.g.,
Error
DeviceNet
Unit)
Explicit response
Normal error response
received
1
0
Instruction
being
executed
1
0
1
0
Previous 0000 hex
Explicit error code
Section 3-25
Instruction
being
executed
0000 hex
DeviceNet network
OK
Error
Explicit error
DeviceNet
node
(e.g., slave)
Instruction
being
executed
0000 hex