HEIDENHAIN iTNC 530 Service Manual page 273

The PL 410B input/output unit is also available with additional analog inputs and inputs for Pt 100
X23:
thermistors. The power supply must comply with EN 50 178, 5.88 requirements for "low
Supply voltage of
voltage electrical separation."
the analog inputs
of the PL 410 B
Connecting terminal
1
2
The corresponding PLC outputs do not function. Depending on the PLC program of the machine
Error
manufacturer, PLC error messages are displayed.
Functional check
If this is not the case.
July 2010
Note
Monitoring the PLC outputs --> See "The TABLE function" on page 11 – 119.
Observe, whether the green LED near the bus connectors X1/X2 is on.
Measure whether the 24 V supply voltage is available at X9/X10.
Note
If LED is not lit up, despite available power supply, the PL board is probably defective.
Measure all other power supply connections.
Note
On older PLC expansion boards PL 4xx B, you may still find fine-wire fuses (glass fuses) on
the board. These may be replaced, if necessary:
On newer PL 4xx B, the glass fuse has been replaced by an SMD fuse.
The SMD fuse has been soldered onto the board. Contact your HEIDENHAIN service
agency.
Pin layout
+24 Vdc as per EN 50 178, 5.88
+0 V
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