Fanuc alarm: 49 - ILLEGAL OPERATION (G68/G69)(M series)

Machine Alarm Error & Message:
49 - ILLEGAL OPERATION (G68/G69)(M series)

Fanuc's Alarm Description: The commands for three-dimensional coordinate conversion (G68, G69) and tool length compensation (G43, G44, G45) are not nested. Modify the program.

Additional Suggestions & Alarm Clarification:
None currently

Help Others:
Post troubleshooting recommendations for (Fanuc alarm: 49 - ILLEGAL OPERATION (G68/G69)(M series)) error message below.

Fanuc CNC Control Models Applicable:
16/18/21, 16i/18i/21i, 160i/180i/210i, 0/00/0-mate, 0i




Manufacturing | Industrial | CNC machinist | Maintenance | Repair

49 - ILLEGAL OPERATION (G68/G69)(M series)

Submitted by Anonymous on Mon, 11/30/2009 - 08:22.

We came across this error message after a control board was replaced during shutdown. Fanuc had updated the control software which actually was the root cause.

The alarm was due to using G54-G59 AFTER the plain conversion used for the right-angle head was enacted. We typically included the G54-G59 on all movements to prevent jumping in code under the incorrect modal address.

Removing the G54-G59 codes stopped the alarm without any adverse affects. After cancelling the plain conversion G69, the G54-G59 codes can be used as normal.

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