Mitsubishi Electric NZ2GF12A4-16D User Manual page 144

When an output is turned on, the load connected to other outputs is also turned on
■Case
When a non-wiring state occurs due to, for example, a shutoff or disconnection between 0V of the load power supply and the
common of a load, a current flows across the load that is off through an unexpected circuit of the output element that is off.
Output module
Source output
Output element
ON
Output control
circuit
Output element
OFF
Output control
circuit
■Action
Connect the load power supply and the load properly.
To prevent the current from flowing across the load that is off, install a diode in each output terminal as shown below.
Source output
11 TROUBLESHOOTING
142
11.6 Examples of Troubles with the I/O Module
Y0
Y1
COM
0V
Y0
Load
Y1 Load
COM
24VDC
0V
Load
Load
Shutoff or disconnection
24VDC