1041
Network Instructions Section 3-25
1) Normal End 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.
2) Error End 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.
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
0000 hex
(normal end)
Previous
Instruction
being
executed
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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