Interrogate Plc Operands In The Nc Program (Fn20: Wait For) - HEIDENHAIN iTNC 530 Technical Manual

8.5.6 Interrogate PLC Operands in the NC Program (FN20: WAIT FOR)

February 2002
With FN20: WAIT FOR you can interrupt the NC program until the condition
programmed in the FN20 block is fulfilled. These conditions can be
comparisons of a PLC operand with a constant. Permitted PLC operands: M,
B, W, D, T, C, I, O
Operator
==
!= or <>
<
>
<=
>=
If you enter no condition, the interruption will continue until the operand = 0.
Examples:
FN20: WAIT FOR I10==1
Continue the NC program, if PLC input I10 is set.
FN20: WAIT FOR I10
Continue the NC program, if PLC input I10 equals zero.
FN20: WAIT FOR B3000>255
Continue the NC program, if the content of B3000 is greater than 255.
Data Transfer NC → PLC, PLC → NC
Function
Equal
Not equal
Less than
Greater than
Less than or equal
Greater than or equal
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