List any two advantages and any two disadvantages of PLC.
Advantages of PLC: i) Increased productivity ii) Increased product quality iii) Increased flexibility and convertibility iv) Reduced manpower v) Reduced cost of product vi) Better inventory control vii) Increased profit viii) Smaller physical size than hard-wire solutions. ix) Diagnostics are centrally available x) Applications can be duplicated faster and less expensively. xi) It is capable to communication with computer in plant.
Disadvantages of PLC: i) PLCs are propitiatory, which means software and parts one manufacturer can’t be easily used in combination with part of another manufacturer. ii) Need skilled person to handle or program PLC. iii) Initial cost is high. iv) To maximize PLC performance and Flexibility, a number of Optional Modules must be added v) PLCs are not very good at handling large amount of data, or complex data.