Advantages and Disadvantages of the programmable logic circuit (PLC)

A programmable logic controller (PLC) is a solid-state device that controls the output of the process through the program given in ladder diagrams.

Advantages of the programmable logic circuit (PLC)

• Flexible in programming and one PLC can operate a number of machines
• Quickly reprogrammed for any change
• Offer easy troubleshooting and correcting any errors
• A large number of contact available
• Number of software timers, counters, relays are available
• Operation of PLC can be observed on display
• PLC is more reliable than relay logic
• Maintenance cost and downtime is less as compared to relay logic
• Security for ladder programming
• PLC is a hardness industrial computer

Disadvantages of the programmable logic circuit (PLC)

• The cost of PLC for small applications is high
• When a problem occurs, hold-up time is indefinite, usually long
• There are limitations of working PLCs under high temperature, vibration conditions.
• Some PLCs turns on when power is restored and may cause an accident

ADVERTISEMENT