Omron SYSMAC CJ - REFERENCE MANUAL 01-2008 Reference Manual page 1083

Network Instructions
Ladder Programming
Examples
Communications Port
Enabled Flag
Execution
A20200
condition
d (Execution completed)
a (Executing)
Communications Port
Enabled Flag
a (Executing)
A20200
1044
Example 1: User Specification of Communications Port Number
KEEP
a (Executing)
The explicit message instruction is executed when a (executing)
turns ON. The port number 0 is specified.
Explicit
message
instruction
The Communications Port Enabled Flag (A20200) is OFF during
Port: 0
network communications and turns ON when they are completed
(for either normal or error completion).
d (Execution completed) is turned ON when a (Executing) turns
ON and the
ON.
A21300
A21300 A21900
A21900
a (Executing) is turned ON and held ON when the
execution condition and Communications Port
Enabled Flag (A20200) turn ON.
a (Executing) is turned OFF when d (Execution
completed) turns ON.
Communications Port Enabled Flag (A20200) turns
d (Execution completed)
If the Explicit Communications Error Flag
(A21300) when execution is completed, explicit
Processing after
memory communications were completed
completing network
normally and normal processing after network
communications communications is performed.
If the Explicit Communications Error Flag
(A21300) is ON when execution is completed, an
error has occurred in explicit message
Processing for network
communications and the Communications Port
communications error:
Error Flag (A21900) is checked. If it is OFF,
Explicit error
processing for an explicit communications error is
performed on the assumption that an explicit
message was sent and an explicit message
Processing for network
response was received.
communications error:
FINS error
Section 3-25
If the Explicit Communications Error Flag
(A21300) is ON when execution is completed, an
error has occurred in explicit message
communications and the Communications Port
Error Flag (A21900) is checked. If it is ON,
processing for a FINS communications error is
performed on the assumption that an explicit
message was never sent.