Page 241 - Electronic Mechanic - TP - Volume - 2

ELECTRONICS MECHANIC - CITS

2 Status LED (Green)
• Indication: The Status LED reflects the operational status of the module.
• Interpretation: A steady green light typically means the module is functioning properly. However, if it’s
blinking or off, it could indicate various states such as a programming error, communication issue, or
module fault.
• Representation: A green LED labeled “STATUS” or “ST”.
• Significance: Reflects the operational status of the PLC module.
• Interpretation: Steady green indicates normal operation; blinking or off may indicate various system states
or faults.

3 Communication LED (Yellow)
• Indication: This LED shows the status of communication between the PLC module and other devices.

• Interpretation: A solid or blinking yellow light usually indicates communication activity. If the LED is off, it
could suggest communication failure, incorrect settings, or faulty cables.
• Representation: A yellow LED labeled “COM” or “COMM”.

• Significance: Indicates the status of communication with other devices or the PLC system.
• Interpretation: Solid or blinking yellow suggests communication activity; off if communication failure
occurs.

4 Input LEDs (Green)
• Indication: Each input channel may have its own LED to indicate the status of the input signal.

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CITS : E & H - Electronics Mechanic - Exercise 180