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These PLC components accept and conditions field signals, then passes the information to the CPU
input modules
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The process of reading field inputs, executing the control program, and controlling the field outputs
cyclic scan
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entering, modifying, and troubleshooting the control program requires this component
programming device
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category of PLCs that is cost competitive with relays, but offer much more functionality
low-end PLC
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main PLC component that enables the electronic circuitry of the other main components to operate
system power supply
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primary programming language for most PLCs
ladder diagrams
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individual control device, designed specifically for controlling machines and processes by means of a stored program and feedback from field sensing and actuating devices
programmable controller
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PLC component that accepts commands frm the CPU to control the states of devices such as motors, indicators, and position valves, and drives
output modules
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name given to the category of PLCs that typically supports up to 4096 input/output dvices
high-end controller
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major component of the PLC controls each machine or process via the input/output modules
central processing unit
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An I/O configuration freature of the PLC allowing I/O racks to be placed at great distances from the CPU
remote I/O
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type of control that places fixed series and parallel cnnections between sensor and actuator devices to determine the control functionality
hardwired logic
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design feature of most PLC components that signals either correct or malfunctioning operation
LED indicators
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PLCs primary design makeup that results in low component failure, minimal space and power consumption, and virtually no mechanical wear
solid state components
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group of compatible PLCs of the same brand having similar design features and covering a range of capability from the simple to the complex
family of controllers
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major PLC section enables the CPU to monitor and control the field devices of a controlled machine or process
input/output system
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name usually given to any PLC supporting fewer than 64 input/output connections
low-end PLC
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input/output interfaces that generally incrportate their own microprocessor and memry, and that are designed to perform specific control or other tasks independent of the CPU
intelligent I/O
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sub-component of the central processing unit that stores the control program
memory
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