-
(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.
address
-
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
instruction register.
CPU
-
to perform a specific operation by processing
either one instruction, a series of instructions, or a complete program.
Execute
-
all the physical components of a programmable
controller, including peripherals, as opposed to the software components that
control its operation.
hardware
-
a collection of plug-in modules that transmit control data
between a PLC and field devices.
I/O system
-
a circuit that permits communication between a CPU and a
field input or output device.
interface
-
an industry standard for representing relay
logic control systems.
ladder diagram
-
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.
PLC
-
a device that is used to enter the control
program into memory and make changes to the stored program.
programming device
-
(1) to acquire data from a source device. (2)
the transfer of data between devices, such as a peripheral device and the
computer.
read
-
the representation of a control program or other logic in relay form.
relay logic
-
the process of reading all inputs, executing the control program, and updating all outputs.
scan
-
the programs that control the processing of data in a system.
software
-
circuitry designed using only integrated
circuits, transistors, diodes, etc., without any electromechanical devices,
such as relays.
solid-state
-
the process of putting information into a
storage location.
write
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