HEIDENHAIN iTNC 530 Service Manual page 79

Meaning of the
LEDs on the
PLD 16-8 LED
Red LED at X4, pin 1
Yellow LEDs at X4, X5 and X6
Green LEDs at X6, pin 9 and pin 10
a. In case of a short circuit of an output, the output voltage is reset.
The displayed logic states must be in agreement with the voltage levels for each output.
--> see "Specifications" on page 10 – 106!
May 2006
The short-circuit monitoring remains in place. It can be reset with the manufacturer's
PLC program or by switching the machine on and off. In order to recognize a short circuit,
a current of 20 A must be able to flow for approximately 3 ms.
If this is not the case (e.g. the 24-V supply limits the current sooner), the short-circuit
monitoring might not become effective.
Meaning
Short circuit of the outputs
Status of the inputs and outputs
24 V power supply of the outputs
a
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