I have HC500 Fanuc 11M Micron 16 serial number is "HC 5379" I am hoping to get going was being shut down for longer periods of time due to COVID and this we believe caused a SUMCHECK error, well besides age. I fixed the SUMCHECK error by simply updating a timer up a second or tenth of a second it turns out, and we thought everything would be super, until we tried to run the spindle. In going through the ladder I found that there is an internal bit 0120 which is attached to a "slide door closed" switch which we cannot find on the machine. I have a background in Allen Bradley PLC's or about 15 years and I suspect that this input was either jumpered out or it was forced or set to "always on" or true since this is what will allow the spindle to start, but this is new to me so any help will be much appreciated.

Thanks

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