M Functions

Select Technology Parameters and choose M Functions.

It is a list of the up to 32 M function numbers which, when executed within a DIN program, effect branching to a subroutine. M functions are sent to the PLC. There, they must be interpreted and the required function must be activated. Distinction is made between synchronized and unsynchronized M functions.

The M functions with the numbers 0 - 499 are synchronized. When such a function is sent to the PLC, the processing of the NC program is interrupted until the PLC acknowledgement has arrived and the read enabling signal is set.

With unsynchronized M functions (≥ 500), the next block of the NC program is executed immediately after the output, without waiting for an acknowledgement from the PLC.