HEIDENHAIN TNC 320 (340 55x-04) - Manual (Page 256)

256 Programming: Q Parameters
8.8 A
d
ditional F
unctions
The following conditions are permitted in the FN 20 block:
In addition, the FN20: WAIT FOR SYNC function is available. WAIT FOR
SYNC
is used whenever you read, for example, system data via FN18
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
FN29: PLC: Transferring values to the PLC
The function FN 29: PLC 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 >=
32 FN 20: WAIT FOR M4095==1
32 FN20: APISPIN[0].NN_SPICONTROLINPOS==1
32 FN 20: WAIT FOR SYNC
33 FN 18: SYSREAD Q1 = ID270 NR1 IDX1
56 FN29: PLC=+10/+Q3/+Q8/+7/+1/+Q5/+Q2/+15