HEIDENHAIN TNC 335 Technical Manual - Manual (Page 270)

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TNC 360 10 Electronic handwheel 4-173
If no axis selection switch is connected (see also MP 7645.2), the third handwheel
is permanently assigned to an axis as entered in MP 7645.1.
MP7645.1 Assignment of 3rd handwheel via machine parameter
Input: 0 to 8
0: Simulation of switch setting 1 (Left-most setting)
The third handwheel is assigned from MP7645.0
(Input value 0 or 1).
1: X axis
2: Y axis
4: Z axis
8: IV axis
MP7645.2: Assignment of 3rd handwheel via axis selection switch or MP7645.1
Input: 0 or 1
0: Assignment via axis selection switch
according to MP7645.0
1: Assignment via MP7645.1.
The axis selection switch transmits data to the PLC inputs I168 to I175.
The axis selection switch can therefore also serve other functions.
10.4.1 Assignment of the switch setting to the PLC inputs
The following tables show the assignments of the switch settings of S1 and S2 to the PLC inputs
I160 to I175.
Both switches function with 0V logic. If, for example, the switch S1 is at setting 3, then input I162 is
logically 0 and inputs I160, I161 and I163 to I167 are logically 1.
Step switch S1
Switch for the selection of the interpolation factor
Switch setting PLC input
1 (Left-most setting) I160
2 I161
3 I162
4 I163
5 I164
6 I165
7 I166
8 (Right-most setting) I167