HEIDENHAIN ITNC 530 - Page 120

11 – 120 HEIDENHAIN Service Manual iTNC 530
Checking the
PLC inputs
8 You have called TABLE.
8 Press the INPUT soft key.
8 Place the cursor on the input to be examined (e.g. GOTO I3 ENTER).
8 Observe the logical state of the input to be checked.
8 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