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How to change PWE=1 on Fanuc

Normally, we are in the SETTING screen, PWE=1, and turn on the parameter modification protection switch. Sometimes it cannot be modified for the following reasons:
When the parameter PKY of No.3299.0 is 0, the parameter protection is determined by PWE=1
  When the parameter is 1, the parameter protection is determined by the signal G46.0 KEYP
At this time, we need to analyze the ladder diagram to query the control of the G46.0 signal, and make the G46.0 signal 1 to open the parameter protection.
Note: OIC system parameter is 3209.7

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