7-2
Section
Using Message Communications
90
Message
Communications
Enabled Flag
Network status
NS indicator
ON (1)
Communications connection made (network
normal)
Lit green
Communications connection not made
(network normal, but communications not
established)
Flashing green
Non-fatal communications error (error in one
or more Slaves)
Flashing red
OFF (0)
Offline or power supply is off (no power
supply, resetting, minor failure, or send error)
Not lit
Fatal communications error
Lit red
Port Enabled
Flag
Execution
Error Flag
Completion
code
Communications
instruction
Previous
code
Instruction
1 executed
Instruction
2 executed
Instruction
3 executed
00 Normal
end
00
04 Busy
00
00 Normal
end
00
1
0
1
0
Completion Codes
Completion codes are stored in memory as shown in the following table at the
completion of execution of CMND(194). The completion code will be 00 or 0000
during execution of the instruction.
Words
Functions
Port #0 to #7
Completion Codes
(A503 to A510)
A503 to A510 contain the completion codes for the
results of communications instruction execution for ports
#0 to #7, respectively.
The completion codes are stored as 2 bytes of data (1 word) upon completion of
the execution of CMND(194). These codes are the same as the response codes
for FINS commands. The first byte of the completion code is placed in bits 08 to
15 and the second byte is placed in bits 00 to 07. Refer to the DeviceNet (Com-
poBus/D) Operation Manual (W267) for more details.
Timing the Reading of Responses
When reading the response from the DeviceNet Interface Unit after execution of
CMND(194), read the response on the rising edge (upward differentiation) of the
Port Enabled Flag, as shown in the following diagram.
Port Enabled
Flag
Processing to read response
