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Specifications of Basic I/O Units Appendix A
Operating Restrictions
Although the CJ1W-OD202 is provided with short-circuit protection, these are for protecting internal circuits
against momentary short-circuiting in the load. As shown in Figure 2 below, the short-circuit protection is auto-
matically released when the Tj equals to Tr. Therefore, unless the cause of short-circuit is removed, ON/OFF
operations will be repeated in the output. Leaving short-circuits for any length of time will cause internal tem-
perature rise, deterioration of elements, discoloration of the case or PCBs, etc. Therefore, observe the follow-
ing restrictions.
Restrictions
If a short-circuit occurs in an external load, immediately turn OFF the corresponding output and remove the
cause. The CJ1W-OD202 turns ON an alarm output bit that corresponds to the external load output number.
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 A089) for every Unit mounting
slot.
The following table shows the correspondence between output bits and bits in the Basic I/O Unit Information
Area.
For example, when the CJ1W-OD202 is mounted in slot 0 on Rack 0, A05000 will turn ON if the output 8 is
short-circuited. When the CJ1W-OD202 is mounted in slot 1 of Rack 0, A05011 will turn ON if the output m+3
is short-circuited
Programming Example
In this example, CJ1W-OD202 is mounted in slot 0 of the Rack 0.
This example shows how to turn OFF output bits CIO 000000 to CIO 000007 immediately if the alarm output bit
A05000 turns ON and how to keep the output bits OFF until the cause is removed and the bit is reset using
work bit W000001.
Output bit 0 or 1 2 or 3 4 0r 5 6 or 7
CJ1W-OD202 Mounted in even slot 0 1 2 3
Mounted in odd slot 8 9 10 11
TIM0
W00000
W00001
A05000
000100
TIM
0000
#0002
W00000
000100
000000
W00000
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