18 – 276 HEIDENHAIN Service Manual iTNC 530 HSCI
18.15.5 Supply voltage for PLC outputs on the PLD-H xx-xx-xx
X11: Pin layout on the PLD-H input/output module:
X12: Pin layout on the PLD-H input/output module:
X21: Pin layout on the PLD-H input/output module:
LED display Green LEDs at terminals 9 and 10 of connector X21 indicate that the power supply is correct.
Errors and
error messages
If the voltage at X21 / terminal 9 or 10 drops during machine operation, the related PLC outputs drop
as well. This can lead to various error messages.
If the voltage at X21 / terminal 9 or 10 is already missing upon switch-on, it may not be possible
to switch the control on completely (depending on the PLC outputs concerned).
Troubleshooting Observe the LEDs on the PLD-Hxx-xx-xx input/output module.
Further analysis --> See ”Bus diagnosis” on page 12 – 147.
Connecting terminal Assignment
1 0 V PLC
2 0 V PLC
Connecting terminal Assignment
1 0 V PLC
2 0 V PLC
The 0 V terminals of X11 and X12 of the PLD-H are connected internally. These connections
are used for connecting the potential of the electronics and for operating the LEDs. Since only
a low current is required (max. 50 mA), it is sufficient to establish only one 0 V connection
(preferably at X11).
Connecting terminal Assignment
9 +24 V PLC for outputs on terminals 1 - 4
10 +24 V PLC for outputs on terminals 5 - 8
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