Omron CQM1H - PROGRAM Programming Manual page 588

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
Programmable Controller
programmed alarm
programmed error
Glossary
Part of the processing performed by the CPU that includes general tasks re-
quired 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 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 de-
vices 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.
Present value is abbreviated as PV. The use of this term is generally restricted
to timers 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.
A computerized device that can accept inputs from external devices and gen-
erate outputs to external devices according to a program held in memory. Pro-
grammable Controllers are used to automate control of external devices.
Although single-unit Programmable Controllers are available, building-block
Programmable Controllers are constructed from separate components. Such
Programmable Controllers are formed only when enough of these separate
components are assembled to form a functional assembly.
An alarm given as a result of execution of an instruction designed to generate
the alarm in the program, as opposed to one generated by the system.
An error arising as a result of the execution of an instruction designed to gen-
erate the error in the program, as opposed to one generated by the system.
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