Examples Of Troubles With The I/O Module; Troubleshooting For Input Circuit - Mitsubishi Electric NZ2MFB2-16A User Manual

11.4

Examples of Troubles with the I/O Module

Troubleshooting for input circuit

An input signal does not turn off No.1
■Cause
There is a leakage current from the input switch (driven by a contactless switch and others).
C
Leakage
current
Power supply
■Action
Connect an appropriate resistor so that the voltage between terminals of the input module would fall below the OFF voltage.
AC input
C
Input module
R
Power supply
The recommended CR constant is as follows: 0.1 to 0.47F + 47 to 120 (1/2W).
An input signal does not turn off No.2
■Cause
There is a leakage current from the input switch (driven by a limit switch with neon lamp).
Leakage
current
Power supply
■Action
Take either of the following actions:
• Connect an appropriate resistor so that the voltage between terminals of the input module would fall below the OFF
voltage. (Same as the action taken when an input signal does not turn off No.1)
• Make the circuit independent and provide another display circuit.
AC input
Input module
AC input
Input module
11 TROUBLESHOOTING
11.4 Examples of Troubles with the I/O Module
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