Troubleshooting for output circuit
This section describes the troubleshooting for output circuit.
A load momentarily turns on when the load power supply is powered on
An incorrect output occurs due to the stray capacitance (C) between collector and emitter of a photocoupler.
(When a high sensitivity load (such as a solid state relay) is used, this incorrect output may occur.)
When the load power supply is powered on rapidly, the current (Ic) flows due to the stray capacitance (C).
The current (Ic) flows to the gate of the transistor (Tr1) of the next stage and the output Y0 turns on for approximately 100s.
SW: Load power supply
(24VDC) at On
10ms or less
11.6 Examples of Troubles with the I/O Module