HEIDENHAIN iTNC 530 Service Manual page 408

The function of the handwheel keys can be checked with the respective PLC inputs. Use the
Checking the keys
PLC diagnosis functions TABLE or LOGIC DIAGRAM:
MP7645 determines whether the handwheel keys are evaluated by the NC or the PLC.
24 – 408
Switch on the machine.
Press the EMERGENCY STOP key.
Call the table with the PLC inputs or the logic diagram.
--> See "Diagnosis Tools in the PLC Mode" on page 11 – 119.
Press the handwheel keys.
Check whether the corresponding inputs change to 1.
Note
Ask the machine manufacturer if MP 7645.0 can be changed for test purposes. The PLC
program may not permit this.
MP7645.0: 0
Evaluation of keys via NC
(Exception: The function keys A, B
and C are evaluated by the PLC.)
X
Y
Z
Slow feed Medium
rate feed rate
–
O109 O110
I173 I174
MP7645.0: 1
Evaluation of all keys by the PLC
IV
V
Actual
position
capture
Fast feed
rate
+
O111
I175
HEIDENHAIN Service Manual iTNC 530
O96
I160
O98
I162
O100 O103
I164
O104 O105 O106
I168 I169
I171
O109 O110 O111
I173 I174
O97
I161
O99
I163
I167
I170
I172
I175