11 TROUBLESHOOTING
11.5 Examples of Troubles with the I/O Module
205
11
■Action
Before turning on or off the external power supply, check that the rise time of the external power supply is 10ms or more.
Then, install a switch (SW1) to the primary side of the external power supply.
When installing the switch to the secondary side, connect a capacitor and resistor, and increase the rise time (10ms or more).
• Sink output
• Source output
R1:Several tens of ohms
Power capacity (External power supply current
*1
)
2
Resistance value (3 to 5)
*2
C1:Several hundreds of microfarads 50V
(Example)
R1 = 40, C1 = 300F
Time constant is calculated as shown below.
C1 R1 = 300 10
- 6
40
= 12 10
-3
s
= 12ms
*1 For details on the current consumption of the external power supply for output part to be used, refer to the performance specifications.
*2 Select the power capacity of resistor to be 3 to 5 times as large as the actual power consumption.
SW1 Programmable
controller
Secondary
side
Primary
side
External power
supply
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