Mitsubishi Electric NZ2GN2S1-16D - Page 212

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11 TROUBLESHOOTING
11.5 Examples of Troubles with the I/O Module
A load operates only by turning on the external power supply (transistor output)
■Cause
• The external power supply is connected with its polarity reversed.
• The reversed polarity may allow current to flow via the output element protection diode into the load.
■Action
Connect the external power supply with the correct polarity.
COM-
Y0
Load
External
power
supply
Incorrect Correct
Output element
protection diode
Sink output
COM+
Y0
Load
External
power
supply
Incorrect Correct
Output element
protection diode
Source output