6 – 386 HEIDENHAIN Technical Manual TNC 426, TNC 430
Assignment of
switch positions to
PLC inputs
The tables below list the assignments of switch positions of S1 and S2 to the
PLC inputs I160 to I175.
The two switches work with a 0 V logic circuit.
Example: If switch S1 is in position 3, input I162 is logically 0, and the inputs
I160, I161, I163 to I167 are logically 1.
Step switch 1: Step switch for choosing the interpolation factor
Step switch 2: Axis selection switch
Switch position PLC input
1 (at the left stop) I160
2I161
3I162
4I163
5I164
6I165
7I166
8 (at the right stop) I167
Switch position PLC input
1 (at the left stop) I168
2I169
3I170
4I171
5I172
6I173
7I174
8 (at the right stop) I175
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