HEIDENHAIN TNC 640 (34059x-04) ISO programming - Manual (Page 289)

Additional functions 9.7
9
TNC 640 | User's Manual for DIN/ISO Programming | 3/2014
289
The TNC 640 uses an extended interface for communication
between the PLC and NC. This is a new, symbolic Application
Programmer Interface (
API). The familiar previous PLC-NC interface
is also available and can be used if desired. The machine tool
builder decides whether the new or old TNC API is used. Enter
the name of the symbolic operand as string to wait for the defined
condition of the symbolic operand.
The following conditions are permitted in the D20 block:
Condition Abbreviation
Equal to ==
Less than <
Greater than >
Less than or equal <=
Greater than or
equal
>=
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
N32 D20: WAIT FOR M4095==1
Example: Stop program run until the PLC sets the symbolic
operand to 1
N32 D20: APISPIN[0].NN_SPICONTROLINPOS==1
Example: Pause internal look-ahead calculation, read current
position in the X axis
N32 D20: WAIT FOR SYNC
N33 D18: SYSREAD Q1 = ID270 NR1 IDX1