Description

Machine switching functions

The timing of the output of M and H functions to the PLC and its subsequent reaction can be synchronised in various ways with motions to be executed.

To simulate the machining time of an M or H function, a time period can be specified in order to determine the run-time of a CNC program.

Characteristics of M and H functions

Possible synchronisation methods
Freely available or default in compliance with DIN 66025
Machining time can be determined
Channel or axis-specific output
Spindle-specific

The CNC channels are each parameterised via an initialisation list (see Channel parameter list). All M and H functions must be specified here. Instead of a channel-specific assignment, an axis-specific assignment and a synchronisation method can be defined.

At the interface to the PLC (High Level Interface) [HLI], M and H functions are output in the channel and axis-specific areas and the PLC further processes them and confirms them accordingly.

M and H functions are enabled for each CNC channel in the channel parameter list via their synchronisation method.

Notice

For safety reasons, M and H functions cannot be used in the CNC program if a synchronisation method is not specified.

In this case, the CNC generates the message P-ERR-20157.

Output

The following options are provided for output to the PLC:

No output
Before / after a motion
After an event

Output to the PLC (HLI) can take place in different ranges of the interface:

In the channel range
In the axis range

Synchronisation

The following options are available for synchronisation with a motion to be executed:

No synchronisation
Before / after a motion
Synchronisation at the transition to the next motion block with machining feed rate ('late' synchronisation implicit)
For an explicit request ('late' synchronisation explicit)
During a motion block (example: edge banding)