SELECT AUTOMATIONS

 PLC control Panel advantages:

• Simplified control panel resulting in less maintenance than with relay logic systems.
  
• Easier interconnection with plant monitoring and control systems.
  
• Easy access to operating and control information.
  
• Easy selection of control settings.

PLC Anvantages:

• PLC’s controls a range of applications from machine automations to critical process applications.
  
• Primary goal of PLC is to eliminate high costs with inflexible relay control systems.
  
• Less troubleshooting and cost effective.
  
• The main difference from other computers is that PLCs are armored for severe conditions (such as dust, moisture, heat, cold) and have the facility for extensive input/output (I/O) arrangements.These connect the PLC to sensors and actuators.
  
• PLCs read limit switches, analog process variables (such as temperature and pressure), and the positions of complex positioning systems.
  
• On the actuator side, PLCs operate electric motors, pneumatic or hydraulic cylinders, magnetic relays, solenoids, or analog outputs.
  
• The input/output arrangements may be built into a simple PLC, or the PLC may have external I/O modules attached to a computer network that plugs into the PLC.