Omron CJ2 CPU UNIT User Manual page 414

Appendices
Restrictions
If a short-circuit occurs in an external load, immediately turn OFF the corresponding output and
remove the cause. An alarm output bit that corresponds to the external load output number is turned
ON. There is an alarm output bit for every common.
When an alarm output bit turns ON, use a self-holding bit for the alarm in the user program and turn
OFF the corresponding output.
The alarm output bit is allocated in the Basic I/O Unit Information Area (A050 to A069) for every Unit
mounting slot.
The following table shows the correspondence between output bits and bits in the Basic I/O Unit
Information Area.
CJ1W-OD204 Mounted in even slot
Mounted in odd slot
CJ1W-OD212 Mounted in even slot
Mounted in odd slot
CJ1W-MD232 Mounted in even slot
Mounted in odd slot
CJ1W-OD232 Mounted in even slot
Mounted in odd slot
For example, when the CJ1W-OD212 is mounted in slot 0 on Rack 0, A50.00 will turn ON if the out-
put 8 is short-circuited. When the CJ1W-OD232 is mounted in slot 1 of Rack 0, A50.09 will turn ON
if the output m+1 is short-circuited.
Programming Example
In this example, CJ1W-OD212 is mounted in slot 0 of the Rack 0.
This example shows how to turn OFF output bits CIO 0.00 to CIO 0.07 immediately if the alarm out-
put bit A50.00 turns ON and how to keep the output bits OFF until the cause is removed and the bit
is reset using work bit W0.01.
W0.01
A50.00
W0.00
A W0.00
B W0.00
H W0.00
A-152
Output bit
W0.00
0.00
0.01
0.07
m m+1
0 to 7 8 to 15 0 to 15
0
8
0
8
0
8
0
8
CJ2 CPU Unit Hardware User's Manual
m+2 m+3
0 to 15 0 to 15
1
9