Cause : 2nd G-function not allowed comes when the NC block which was read in contains an illegal 2nd G function. The NC program number and NC block number in which the NC block decoder detected the error can be read out with the "output actual values - decoder error location" task.

1. MDI mode:Only G30 to G39 (acceleration override) can be entered as the 2nd G function.
2. Automatic/single-block mode:Define a legal 2nd G function according to the table (see the Programming Guide).