11 TROUBLESHOOTING
11.4 Examples of Troubles with the I/O Module
89
11
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Action
Take either of the following two actions:
• Action 1: To suppress the back EMF, connect a diode parallel to the load where back EMF is generated in [3].
• Action 2: Configure a sneak current path by connecting a diode across positive and negative of the external power supply.
When simultaneously taking an action for the case where load is briefly turned on when powering on the external power
supply, connect the diode in parallel with C1 and R1 as shown in the frame of dotted line.
D1:
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
[3]
Sink output
Source output
+ Back electromotive force -
Load
Load
- Back electromotive force +
ON
OFF
[2]
Y0
Y1
COM-
CTL+
D1
C1 R1
Example 1
Load
Load
[1] Shut off
+ Back electromotive force - [3]
Sink output
ON
OFF
[2]
Y0
Y1
COM+
CTL-
D1
C1 R1
Example 1
Load
Load
Source output
- Back electromotive force + [3]
[1] Shut off
Содержание NZ2MFB1-32D
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