Mitsubishi Electric NZ2MF2S1-32D User Manual page 105

An input signal does not turn off No.3
■Cause
There is a leakage current due to the line capacity of the wiring cables. (The line capacity, C, of a twisted pair cable is as
follows: C = approx. 100pF/m.)
Leakage
C
current
Power supply
■Action
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)
A leakage current is not generated, however, where the power supply lies in the input device side like the figure below:
Power supply
An input signal does not turn off No.4
■Cause
Even though the switch with LED indicator is turned off, leakage current exceeding the OFF current flowing through the input
module has occurred.
Leakage current
■Action
Connect an appropriate resistor so that the current flowing through the input module falls below the OFF current.
Resistor
For the calculation example of a resistor to be connected, refer to the following.
Page 104 Calculation example
AC input
Input module
AC input
Input module
DC input (sink)
Input module
DC input (sink)
Input module
11 TROUBLESHOOTING
11.4 Examples of Troubles with the I/O Module
11
103