HEIDENHAIN TNC 640 (34059x-05) - Manual (Page 329)

Additional functions 9.8
9
TNC 640 | User's Manual
HEIDENHAIN Conversational Programming | 1/2015
329
FN 19: PLC – Transfer values to the PLC
This function may only be used with the permission
of your machine tool builder.
The FN 19: PLC function transfers up to two numerical values or Q
parameters to the PLC.
FN 20: WAIT FOR – NC and PLC synchronization
This function may only be used with the permission
of your machine tool builder.
With the FN 20: WAIT FOR function you can synchronize the NC
and PLC during a program run. The NC stops machining until the
condition that you have programmed in the
FN 20: WAIT FOR block
is fulfilled.
SYNC is used whenever you read, for example, system data via
FN18: SYSREAD that require synchronization with real time. The
TNC stops the look-ahead calculation and executes the subsequent
NC block only when the NC program has actually reached that
block.
Example: Pause internal look-ahead calculation, read current
position in the X axis
32 FN 20: WAIT FOR SYNC
33 FN 18: SYSREAD Q1 = ID270 NR1 IDX1