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A load operates only by turning on the external power supply (transistor output)
■Cause
• The external power supply is connected with its polarity reversed.
Sink output
Load
Y0
COM-
Output element
protection diode
Source output
Load
Y0
COM+
Output element
protection diode
• 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.
11 TROUBLESHOOTING
210
11.5 Examples of Troubles with the I/O Module
Incorrect Correct
External
power
supply
Incorrect
Correct
External
power
supply
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Table of Contents
Troubleshooting
