PLC called a programmable logic controller, it has specially designed computer to operate in an industrial environment, which can operate in a wide range of temperature and humidity. Here this post gives a lot of advantages and disadvantages of PLC to better understood this topic.
Advantages of PLC:
- Rugged and designed to withstand vibrations, temperature, humidity and noise
- PLC has a lot of contacts and low cost and safe
- It has a very faster scan time, it has a fast operating time
- A wide range of control application
- It has capable to communicate with a computer in the plant
- It has great computational capabilities
- It has shorter training time required
- It has a small physical size
- It has project cost can be accurately calculated
- It has supervisory control capability
- PLCs are easily programmed and it was relatively easily understood programming language
- Have interfacing for input and output already inside the controller
- One single programmable logic controller can easily run many machines so it is flexible
- It has high-speed counters
- It has shorter project implementation time
- Troubleshooting in programming and reprogramming
- The documentation was easy to do
- It has a high level of reliability and low maintenance
- Security in terms of programming
- Adaptive to changes in production
Disadvantages of PLC:
- There is too much work required in connecting wires
- It has fixed circuit operation
- PLCs manufacturers offer only closed-loop architecture
- PLC is new technology so that should require training
- There is a limitation of working of PLCs under high temperature, vibrations conditions
- Some PLCs turn on when power is restored and may cause an accident
- There is a difficulty with changes or replacement
- Need extra security equipment such as really
- Some application that performs a single function is not efficient in the use of PLC
- Limited usage environments high temperatures and harsh vibrations can disrupt electronic equipment on the PLC
- PLC is not considered necessary when it has applied to industrial systems that do not need to change the wiring
- PLC is designed by semiconductors, which depends on the thermal characteristics
- It is always difficult to find an error and requires a skillful workforce
- When uses PLC, a problem occurs hold up time is indefinite and usually long
- A number of operational modules must be added to maximize flexibility and performance
- 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.
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