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What is the disadvantage of Personal computer as a programmer for PLC?

What is the disadvantage of Personal computer as a programmer for PLC? Correct Answer It is affected by electrical noise, temperature and humidity

The PLC has the following advantages over Electromechanical Relay:

  1. PLCs are more reliable and faster in operation.
  2. Program editing and modifying are easier.
  3. They are compact and can be expanded easily
  4. They require less electrical power
  5. They are less expensive when compared to Hardwired systems of the same number of control functions
  6. It can display multiple readings at a time.
  7. Hard-wired electromechanical relays lack flexibility.
  8. Can be used in any industrial environment such as dust, temperature, moisture, acid or alkali, etc
  9. PLCs have very few hardware failures when compared to electromechanical relays
  10. Special functions such as time-delay actions and counters can be easily performed using PLCs

 

Disadvantages of PLC:
  1. There is too much work required in connecting wires
  2. It has 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 a difficulty with changes or replacement
  8. Need extra security equipment such as really
  9. Some application that performs a single function is not efficient in the use of PLC
  10. It is affected by electrical noise, temperature and humidity
  11. PLC is not considered necessary when it has been applied to industrial systems that do not need to change the wiring.

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