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Troubleshooting Problems in Modules Section 9-3
Motion Control Module Errors
Input Errors
Error condition Probable cause Remedy
The Motion Control Module’s RUN indicator does
not go ON.
An error in program is causing a
fatal error
Correct program.
Motion Control Module does not operate or does not
operate properly.
The I/O bus is faulty. Replace the Motion Control
Module.
A particular I/O point does not operate.
Error occurs in 8-point or 16-point units.
A particular I/O point stays ON.
None of a particular Module’s I/O points will go ON.
Error condition Probable cause Remedy
None of inputs turn ON.
(Indicators are not lit.)
(1) External input power supply
is not being supplied.
Connect a proper external input
power supply.
(2) The external input power
supply voltage is too low.
Adjust supply voltage to within
proper range.
(3) Terminal block connector is
not making good contact.
Replace terminal block connec-
tor.
None of inputs turn ON.
(Indicators are lit.)
Input circuit is faulty. Replace the Module.
None of inputs turn OFF. Input circuit is faulty. Replace the Module.
A particular input does not turn ON. (1) Input device is faulty. Replace the input device.
(2) Input wiring disconnected. Check input wiring.
(3) Faulty terminal block connec-
tor contact.
Replace terminal block connec-
tor.
(4) External input’s ON time is
too short.
Adjust input device
(5) Faulty input circuit Replace the Module.
(6) An input bit address is used
in an output instruction.
Correct program.
A particular input does not turn OFF. (1) Input circuit is faulty. Replace the Module.
(2) An input bit address is used
in an output instruction.
Correct program.
Input turns ON/OFF irregularly. (1) External input voltage is low
or unstable.
Adjust external input voltage to
within the proper range.
(2) Malfunction due to noise. Take protective measures
against noise, such as:
(1) Install surge suppressor.
(2) Install isolating transformer.
(3) Install shielded cables
between the inputs and loads.
(3) Faulty terminal block connec-
tor contact.
Replace terminal block connec-
tor.
Errors occur in 8-point or 16-point blocks, i.e., for the
same common.
(1) Faulty terminal block connec-
tor contact.
Replace terminal block connec-
tor.
(2) Faulty data bus Replace the Module.
(3) Faulty CPU Replace the Module.
Input indicator does not light, but input operates nor-
mally.
Faulty indicator or indicator cir-
cuit.
Replace the Module.