Monitoring The Plc Inputs And Outputs - HEIDENHAIN iTNC 530 Service Manual

18.2 Monitoring the PLC Inputs and Outputs

PLC inputs When checking the PLC inputs, proceed as follows:
 Switch off the main switch of the machine.
 Connect the universal measuring adapter to connector X42 or X46 between the MC and
the connecting cable.

Switch the machine On again.
 Press the following key combination:
The logic states for the inputs are displayed on the screen. These must be in agreement with
the voltage level for each input.
If, at correct input voltage, there is a difference between the logical condition and the voltage
level of an input, then the corresponding input board of the logic unit or the PL 405B/510B
I/O unit is defective.
18 – 252
Note
The voltage levels for the PLC inputs or the output current for the PLC outputs on the
PL 405B/410B must be measured directly at the corresponding terminal.
 Select the Programming and Editing mode.
 Prepare iTNC for entry of code number.
 Confirm.

Call TABLE function.

Display table for inputs.
 Press the END key twice to end the TABLE function and exit the Programming
and Editing mode.
 Enter the code number.
HEIDENHAIN Service Manual iTNC 530