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Industrial Automation
Programmable Logic Controller: Definition
Definition: “small computers, dedicated to automation tasks in an industrial environment"
Formerly:
Today:
cabled relay control (hence 'logic'), analog (pneumatic, hydraulic) governors
specialized computer performing control and regulation
Function: Measure, Command, Control
Distinguish Instrumentation
AP = Automates Programmables industriels
SPS = Speicherprogrammierbare Steuerungen
flow meter, temperature, position,…. but also actors (pump, …)
Control
Visualization
programmable logic controllers with digital peripherals & field bus
HMI in PLCs (when it exists) is limited to control of operator displays
3/100 2.3 Programmable Logic Controllers