read failed: Illegal data address

[sx3]

I tried it, but it doesn't seem, to work.. I have log(value) in the end, and the value shows up in the log.
I tried with both value=0 and 1, no difference.

I get nothing in the error log either.

Where in the code do I actually settrue/false to the register bit? I guess the UPS would want a "true" in BOOL for the bit to react.
Also, do I need to setslave in TCP script as I have done?