210
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
Summary of Contents for NZ2GN2B1-32D
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