Fanuc Alarm 30: ILLEGAL OFFSET NUMBER
Fanuc Alarm 30: ILLEGAL OFFSET NUMBER
Fanus Control Model: Series 0/16/18/21/30i/31i/32i
Description
This alarm occurs when the CNC control is commanded to use a Tool Offset Number that does not exist in the machine’s memory or exceeds the maximum limit defined by your system’s parameters.
This problem is usually caused by incorrect use of T-codes (tool numbers) or H/D codes (height and diameter offsets).
Invalid D or H code: The number you entered in the program with H (Tool Length) or D (Tool Radius) is greater than the total offset capacity of the machine.
How to Fix Alarm
Find the H and D codes in your G-code program. See if the numbers written next to them match the numbers on your machine’s Offset Page.
This problem is usually just a number error in the programming. Just make sure that the offset number you are calling is in the machine’s “Offset Table”.