HEIDENHAIN iTNC 530 Service Manual page 80

Service diagnosis If there is a difference (e.g., the logic state is 1, but the voltage level is below the tolerance
range), proceed as follows:
Permissible output currents --> see "Nominal operating current per output" on page 14 – 222
10 – 80
PLC output defetive?
Unplug connecting cable or disconnect wires
and check for short-circuit
Short-circuit?
Reconnect device and
interconnect an ammeter
Measure output current during operation
Output current too high?
Output board of MC or of
PLC I/O board defective, or
bread in connector, or
interference on a PLC bus
Note
It is not possible to measure PLC outputs directly at the handwheel or at the cable adapter!
Note
If the test adapter (or the "Universal Measuring Adapter") by HEIDENHAIN is available, they
can be connected between the connectors X41 and X46of the MC and the voltage level of
the output to be checked can be measured.
--> see "Inspection, Measuring and Test Equipment" on page 29 – 455
Yes
No
Yes
No
Connecting cable, wires, relay, etc.
defective
Configuration may be faulty;
contact the machine tool builder!
HEIDENHAIN Service Manual iTNC 530