Cyclical Program Execution.

·        Read inputs pins and update process inputs image

·        Executes user program once.

·        Writes process image to outputs pins.

·        Take care of system processes such as communication with PLCs, updating user program, checking for STOP condition etc.

·        Loop back 

Cyclical Program Execution.

Types of automation topologies & Components of automation

Types of automation topologies

·        Hardwired relay logic

·        Dedicated card control

·        PLC based automation

·        DCS based automation.

·        PC based automation. 

Components of automation.

·        Sensor (RTD, TC, Proximity switches, Flow sensors etc.)

·        Transmitter and/or switch (TT, PT, FT, pH Transmitter etc.)

·        Controller (PLC, DCS etc.)

·        Actuators (Contactor, Relay, VFD, I/P Converter etc.)

·        Final Control Elements (Motors, Heaters, Control Valves, conveyors etc.)

·        Human Machine Interface (HMI)

·        Supervisory control and data acquisition (SCADA)

·        Panels, wiring and cabling