6 – 390 HEIDENHAIN Technical Manual TNC 426, TNC 430
With Module 9004 you can evaluate the rising or falling edge of the PLC
inputs.
Module 9002 Reading all inputs of a PLC input/output unit
In PLC addresses you can read the current states of the PLC input/output unit.
(See "Mounting and Electrical Installation” on page 3 – 5).
The memory contents remain unchanged until you call this module or Module
9008. The module does not recognize whether a PLC input/output unit is
actually connected.
The program can be called only in the cyclic PLC program.
Call:
PS B/W/D/K <Number of the PL>
0: First PLC input/output unit
1: Second PLC input/output unit
2: Third PLC input/output unit
3: Fourth PLC input/output unit
CM 9002
Error recognition:
Note
As of NC software 280 476-03, before the PLC program is converted, the
PLC outputs are reset.
As of NC software 280 476-03, the memories of the PLC outputs are also
reset.
As of NC software 280 476-09, an attempt is made to reset the PLC outputs
when a power fail occurs.
Marker Value Meaning
M4203 0 Inputs were read
1 Error code in W1022
W1022 2 Invalid PL no.
24 Module was called in a spawn job or submit job
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