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(7) When an output is turned on, a load connected to the other output is also
turned on (transistor output (source type)).
Case
Cause
If the wire connecting 0V of an external power supply and a common of a load is cut off or disconnected, a current flows to the load that is
off due to a parasitic circuit of the output element that is off.
If a current keeps flowing under the above condition, a failure may occur.
Action
Connect the external power supply and loads correctly.
To prevent the condition described above, connect a diode to each output terminal as shown below.
Load
Load
Y0
Y1
COM
0V
24V
ON
OFF
Switch off
or
disconnection
Source output
Output
control
circuit
Output
control
circuit
Output
element
Output
element
Transistor
output module
Load
Load
Y0
Y1
COM
0V
24V
Source output