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What is a PLC, Specifying
| Quantity,
Type and Location of I/O Number of Inputs and output points AC or DC voltage Analog or Discrete Concentrated or spread out (distributed) Communication Requirements Protocol/Network used Devices to communicate with (HMI, other PLCs, etc) Speed of Application Response time required (throughput) of the system How fast does the process change Control Architecture Philosophy Centralized Control, Distributed Control or combination Redundancy - CPUs, Power Supplies, etc Programming Software IEC vs. 984 Installed base / what is currently being used User Logic Size and complexity of Program Feedback control used |