Omron CQM1 Operation Manual page 149

output bit
output device
output point
output signal
overflow
overseeing
overwrite
parity
parity check
PC
PC configuration
PC System
PCB
PC Setup
Peripheral Device
peripheral servicing
port
positive delay
Power Supply Unit
present value
printed circuit board
PROGRAM mode
Glossary
A bit in the IR area that is allocated to hold the status to be sent to an output
device.
An external device that receives signals from the PC System.
The point at which an output leaves the PC System. Output points correspond
physically to terminals or connector pins.
A signal being sent to an external device. Generally an output signal is said to
exist when, for example, a connection point goes from low to high voltage or from
a nonconductive to a conductive state.
The state where the capacity of a data storage location has been exceeded.
Part of the processing performed by the CPU Unit that includes general tasks
required to operate the PC.
Changing the content of a memory location so that the previous content is lost.
Adjustment of the number of ON bits in a word or other unit of data so that the
total is always an even number or always an odd number. Parity is generally
used to check the accuracy of data after being transmitted by confirming that the
number of ON bits is still even or still odd.
Checking parity to ensure that transmitted data has not been corrupted.
See Programmable Controller.
The arrangement and interconnections of the Units that are put together to form
a functional PC.
With building-block PCs, all of the Units connected up to, but not including, the
I/O devices. The boundaries of a PC System are the PC and the program in its
CPU Unit at the upper end; and the I/O Units at the lower end.
See printed circuit board.
A group of operating parameters set in the PC from a Programming Device to
control PC operation.
Devices connected to a PC System to aid in system operation. Peripheral
devices include printers, programming devices, external storage media, etc.
Processing signals to and from peripheral devices, including refreshing, com-
munications processing, interrupts, etc.
A connector on a PC or computer that serves as a connection to an external
device.
A delay set for a data trace in which recording data begins after the trace signal
by a specified amount.
A Unit that connected to a PC that provides power at the voltage required by the
other Units.
The current value registered in a device at any instant during its operation. Pres-
ent value is abbreviated as PV. The use of this term is generally restricted to tim-
ers and counters.
A board onto which electrical circuits are printed for mounting into a computer or
electrical device.
A mode of operation that allows inputting and debugging of programs to be car-
ried out, but that does not permit normal execution of the program.
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