What are the disadvantages of PLC

PLC (Programmable Logic Controllers)
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Explain the disadvantages of PLC

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Disadvantages of PLC:

  1. There is too much work required in connecting wires.

  2. It has a fixed circuit operation.

  3. PLCs manufacturers offer only closed-loop architecture.

  4. PLC is new technology so that should require training.

  5. There is a limitation of working of PLCs under high temperature, vibrations conditions.

  6. Some PLCs turn on when power is restored and may cause an accident.

  7. There is difficulty with changes or replacement.

  8. Need extra security equipment such as relays.

  9. Some application that performs a single function is not efficient in the use of PLC.

  10. Limited usage environment high temperature and harsh vibration can disrupt electronics equipment on the PLC.

  11. PLC is not considered necessary when it has been applied to industrial systems that do not need to change the wiring.

  12. PLC is designed by semiconductors, which depends on the thermal characteristics.

  13. It is always difficult to find an error and requires a skillful workforce.

  14. When we use PLC if a problem occurs then the hold-up time is indefinite usually long.

  15. Number of operational modules must be added to maximize flexibility and performance.

  16. PLCs are propitiatory, meaning that the software and the use of parts can’t be easily used by one manufacturer in combination with some uses by another manufacturer.

  17. Big disadvantages, if no available switch over back up to continuously support the normal operation of a control.

  18. Required huge UPS ( uninterruptable power supply) for operational safety standards.