Fanuc Alarm 4504: ILLEGAL COMMAND IN ARC

Fanuc Alarm 4504: ILLEGAL COMMAND IN ARC

Fanuc Control Model: 16 / 18 / 21-Series, 16i/18i/21i and 30i/31i/32i series

Fanuc Alarm Description

In an arc (G77) command, the radius (I) or the number of holes (K) was set to zero or a negative value. Alternatively, I, J, K, or P was not specified.


Have you faced Fanuc Alarm 4504 ILLEGAL COMMAND IN ARC on your machine? Share your experience or troubleshooting tips in the comments below to help other CNC operators and programmers clear this error faster!

 

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