11 – 120 HEIDENHAIN Service Manual iTNC 530 HSCI
Checking the
PLC inputs
8 You have called the TABLE.
8 Press the INPUT soft key.
8 Place the cursor on the input to be examined (e.g. GOTO I10 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, etc.
At the terminals (X6) of the MB 620 machine operating panel.
At the terminals (X4, X5) of the UEC 11x compact controller unit.
At the terminals (X9) of the PLB 62xx system module.
At the terminals (X11, X12) of the I/O module PLD-H 16-08-00 or PLD-H 08-16-00.
For the input signals of the switching inputs applies:
Assignment --> See ”Connector designations and pin layouts” on page 28 – 453.
Voltage range MB 620, UEC 11x, PLB 62xx, PLD-H
“1” signal: U
i
11 V to 30 V
“0” signal: U
i
–3 V to 2.2 V
An active input is signaled by a yellow LED at the PLD-H.
It is not possible to measure PLC inputs directly at the handwheel or at the cable adapter for
the handwheel.
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