11 TROUBLESHOOTING
11.5 Examples of Troubles with the I/O Module
207
11
■Action
Take one of the two actions shown below.
Action 1.To suppress the back electromotive force, connect a diode parallel to the load where back electromotive force is
generated.
• Sink output
[3]
• Source output
[3]
Action 2.Configure a sneak current path by connecting a diode across positive and negative of the external power supply.
When taking the action described in Example 1 at a time, connect a diode parallel to C1 and R1.
D1:
Reverse voltage VR (VRM)
*1
Forward current IF (IFM)
*2
*1 Approximately 10 times the rated voltage in the specifications
Example: 24VDC Approx. 200VDC
*2 Twice the maximum load current (common) in the performance specifications or more
Example: 5A/1 common 10A or more
Back electromotive
force
Load
+-
Load
Back electromotive
force
+
-
COM-
CTL+
Y0
Y1
[3]
[2]
ON
OFF
D1
C1
R1
[1]
Example 1
Load
Load
Shut off
Back electromotive
force
Sink output
+
-
[3]
[1]
Y0
Y1
COM+
CTL-
D1
R1
C1
[2]
ON
OFF
Example 1
Load
Load
Source output
Back electromotive
force
Shut off
+
-
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