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User's Manual

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PMAC User Manual
246 Writing a PLC Program
Note:
It is never advisable to have PLC 0 or PLCC 0 running on power-up. Therefore,
do not save an I5 value of 1 or 3. Instead, save I5 as 2; then in PLC 1 reset PLC,
use a command sequence like:
DISABLE PLCC 0
DISABLE PLC 0
I5=3
The PLC 0 and/or PLCC 0 can then be enabled as needed.