Page 240 - Electronic Mechanic - TP - Volume - 2

ELECTRONICS MECHANIC - CITS

MODULE 19: PLC & Electronic pnuematic

EXERCISE 180: Demonstrate various indicators on PLC

modules and interpret

Objectives

At the end of this exercise you shall be able to
• to demonstrate various indicators on PLC modules and interpret
• identify various indicators on PLC.

Requirements

Tools/ Materials
• PLC Module • Sensors and Actuators
• Power Supply • LED Indicators
• I/O modules(devices) • Programming device
• Wiring Materials and connectors

Procedure

Theory
• Indicators and Alarms

The indicators/alarms include devices that can represent a predetermined state in a basic PLC control system.
Indicators such as pilot lights—usually a green one, may represent that the PLC system is running properly. A
red pilot light usually represents a PLC system that does not have ongoing operation.

1 Power LED (Green)
• Indication: This LED indicates whether the module is receiving power.
• Interpretation: If the Power LED is lit, it signifies that the module is powered on. If it’s not lit, it suggests
there might be a power supply issue, such as a disconnected power source or a faulty power supply unit.

• Representation: A green LED labeled “PWR” or “POWER”.
• Significance: Indicates whether the module is receiving power from the power supply unit.
• Interpretation: Lit when power is supplied; off if there’s a power supply issue.

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