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CHAPTER 8 TROUBLESHOOTING
8
8.1 Troubleshooting for Input Circuit
CHAPTER 8 TROUBLESHOOTING
8.1 Troubleshooting for Input Circuit
(1) An input signal does not turn off.
(a) Case 1
(b) Case 2
Case
Cause
• The leakage current of an input switch occurred. (e.g. drive by a contactless switch)
Action
• Connect an appropriate resistor so that the voltage across the terminals of the input module is lower than the OFF voltage.
For the CR constant, 0.1 to 0.47µF + 47 to 120 (1/2W) is recommended.
Case
Cause
• The leakage current of an input switch occurred. (e.g. drive by a limit switch with neon lamp)
Action
Take either of following actions.
• Connect an appropriate resistor so that the voltage across the terminals of the input module is lower than the OFF voltage (same action
as the case 1).
• Separately configure a display circuit that is independent from the existing circuit.
Power supply
AC input
Input module
Leakage
current
C
R
AC input
Input module
Power supply
C
Power supply
AC input
Input module
Leakage
current