11 TROUBLESHOOTING
11.4 Examples of Troubles with IO-Link Modules
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11.4 Examples of Troubles with IO-Link Modules
Troubleshooting for input circuit
This section describes the troubleshooting for input circuit.
A signal incorrectly inputs data
■Cause
Noise is taken as input data.
■Action
• To prevent excessive noise, avoid installing power cables together with I/O cables.
• Connect surge absorbers to noise-generating devices such as relay and conductors using the same power supply or take
other noise reduction measures.
Troubleshooting for output circuit
This section describes the troubleshooting for output circuit.
A load momentarily turns on from off when the system is powered off
■Cause
When an inductive load is connected, the load [2] may turn on from off due to a sneak current of back EMF at the time of
shutoff [1].
■Action
To suppress the back EMF, connect a diode parallel to the load where the back EMF is generated in [3].
D1 is as follows.
Reverse voltage VR (VRM)
*1
Forward current IF (IFM)
*2
*1 Approximately 10 times as large as the rated voltage in the specifications
Example: 24VDC Approximately 200V
*2 Twice as much as the maximum load current (common) in the specifications or more
Example: 2A/1 common 4A or more
ON
OFF
CQ1
CQ2
+24V
CQ8
24G
[2]
IO-Link module
- Back electromotive force + [3]
[1] Shut off
Source output
Load
Load
D1
- Back electromotive force +
Load
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