HEIDENHAIN iTNC 530 Service Manual page 120

Checking the
PLC inputs
11 – 120
You have called TABLE.
Press the INPUT soft key.
Place the cursor on the input to be examined (e.g. GOTO I3 ENTER).
Observe the logical state of the input to be checked.
For this purpose measure the voltage for the input to be checked, e.g.:
At the terminal strips in the electrical cabinet where the PLC inputs are connected.
Directly at relay terminals, ect.
At the terminals (X3) of the machine operating panel
At the terminals (X3, X4, X5, X6) of the PL 4xxB input/output unit
At the terminals (X4, X5) of the input/output module PLD 16-8
HEIDENHAIN Service Manual iTNC 530