Chapter 5 Maintenance and Inspection
5.4 Module Replacement (EN531/EN531T)
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Observe the following precautions when removing and inserting a card.
When an EN5 module has been replaced, switch power off, wait for about 5 minutes,
then switch power back on. If power is switched back in without waiting for 5 minutes,
the EN5 module cannot be recognized by the OIS
model 1000 Loop Controller L1 User's Manual - Basic Hardware