Mitsubishi Electric NZ2MFB2-16A User Manual page 92

When the output module is off, the LED connected as a load dimly turns on
■Cause
The load operates by the leakage current when the output module is off.
Output module
Sink output
■Action
Connect a resistor of 5 to 50k in parallel with the LED load.
When a digital display unit is connected as a load, the display may not be normal
■Cause
The load operates by the leakage current when the output module is off.
Output module
Sink output
■Action
Install a pull-up resistor of 5 to 50k and 0.5 (W) between the outputs of 24VDC power supply and the output module.
11 TROUBLESHOOTING
90
11.4 Examples of Troubles with the I/O Module
Countermeasure
Y0
LED
24VDC
COM-
Digital display unit
Countermeasure
(input signal section)
Y0
24VDC
CTL+
COM-
Dedicated IC