Omron CJ - INSTRUCTIONS Reference Manual page 954

3. Instructions
Accessing the Completion Code after Executing Communications Instructions
The completion codes are generally used to troubleshoot errors when they occur. A completion code of
0000 hex can, however, also be used to confirm that communications have been completed normally.
Execution condition
d (Execution completed)
a (Executing)
a (Executing) c (Standby)
916
KEEP
a
(Executing)
When a (Executing) turns ON, a communications instruction
(SEND(090), SEND2(491), RECV(098), RECV2(492), CMND(490),
Communications
instructions
CMND2(493), PMCR(260), or PMCR2(264)) is executed with the
communications port specified as "F."
Port: F
The communications port number that was automatically allocated is
MOV stored in a work word b (Used port) from A218 (Used Communications
Port Number).
A218
b
(Port)
Places the PLC memory address (A216) containing the completion code
for the communications instruction executed with automatic allocation of
MOVL
the communication port into work word e (Code storage location).
A216
e (Code storage Confirms that the First Cycle Flags after Network Communications
location)
Finished for the automatically allocated port number (corresponding bit for
word b in A214) is ON.
c (Standby)
d (Execution completed)
TST
A214
b
(Used port)
<>
,IR0
#0000
Bit c turns OFF the cycle after the
communications instruction was
executed to enable checking the
completion code.
Places the PLC memory
address of the completion code
from work word e (Code
storage location) into index
register IR0.
MOVL
e (Code storage
location)
IR0
Network communications
error processing
If the completion code indirectly address via IR0
does not equal 0000 hex, communications error
processing is performed.
CS/CJ/NSJ Series Instructions Reference Manual (W474)