The essence of any automated system is the control unit. For many automated systems this control unit is a Programmable Logic Controller (PLC)

PLC overview
Types of PLC
PLC Inputs
PLC Outputs
PLC Internal Componants (relays, timers, counters)
PLC Data Registers
PLC shift Registers
PLC Programming
PLC Faulfinding
PLC Networking
Socrates Workforce Solutions
Workforce Capability and Talent Development