HEIDENHAIN TNC 620 (73498x-01) ISO programming - Manual (Page 236)

236 Programming: Q parameters
8.7 A
d
ditional functions
The following conditions are permitted in the D20 block:
In addition, the D20 function is available. WAIT FOR SYNC is used
whenever you read, for example, system data via D18 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: Stop program run until the PLC sets marker 4095 to 1
Example: Stop program run until the PLC sets the symbolic
operand to 1
Example: Pause internal look-ahead calculation, read current
position in the X axis
D29: Transfer values to the PLC
The D29 function transfers up to eight numerical values or
Q parameters to the PLC.
Increments and units: 0.1 µm or 0.0001°
Example: Transfer the numerical value 10 (which means 1 µm or
0.001°) to the PLC
Condition Abbreviation
Equal ==
Less than <
Greater than >
Less than or equal <=
Greater than or equal >=
N32 D20: WAIT FOR M4095==1
N32 D20: APISPIN[0].NN_SPICONTROLINPOS==1
N32 D20: WAIT FOR SYNC
N33 D18: SYSREAD Q1 = ID270 NR1 IDX1
N56 D29 P01 +10 P02 +Q3