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(1) the location in a computer’s memory where
particular information is stored. (2) the alphanumeric value used to identify a
specific I/O rack, module, group, and terminal location.
the part of a programmable controller
responsible for reading inputs, executing the central program, and updating
outputs. Consists of the arithmetic logic unit, timing/control circuitry,
accumulator, scratch pad memory, program counter, address stack, and
to perform a specific operation by processing
either one instruction, a series of instructions, or a complete program.
all the physical components of a programmable
controller, including peripherals, as opposed to the software components that
control its operation.
a collection of plug-in modules that transmit control data
between a PLC and field devices.
a circuit that permits communication between a CPU and a
field input or output device.
an industry standard for representing relay
logic control systems.
a solid-state control device that can be programmed to
control processes or machines operations. It consists of the processor, memory,
input/output modules, the power supply, and the programming device.
a device that is used to enter the control
program into memory and make changes to the stored program.
(1) to acquire data from a source device. (2)
the transfer of data between devices, such as a peripheral device and the
the representation of a control program or other logic in relay form.
the process of reading all inputs, executing the control program, and updating all outputs.
the programs that control the processing of data in a system.
circuitry designed using only integrated
circuits, transistors, diodes, etc., without any electromechanical devices,
such as relays.
the process of putting information into a