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Glossary
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output bit
A bit in the IR area that is allocated to hold the status to be sent to an output
device.
output device
An external device that receives signals from the PC System.
output point
The point at which an output leaves the PC System. Output points corre-
spond physically to terminals or connector pins.
output signal
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.
overseeing
Part of the processing performed by the CPU that includes general tasks re-
quired to operate the PC.
overwrite
Changing the content of a memory location so that the previous content is
lost.
parity
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 gener-
ally used to check the accuracy of data after being transmitted by confirming
that the number of ON bits is still even or still odd.
PC
An acronym for Programmable Controller.
PCB
An acronym for printed circuit board.
PC configuration
The arrangement and interconnections of the Units that are put together to
form a functional PC.
PCF
Acronym for plastic-clad optical fiber cable.
PC Link System
A system in which PCs are connected through PC Link Units to enable them
to share common data areas, i.e., each of the PCs writes to certain words in
the LR area and receives the data of the words written by all other PC Link
Units connected in series with it.
PC Link Unit
The Unit used to connect PCs in a PC Link System.
PC System
With building-block PCs, all of the Racks and independent Units connected
directly to them 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, Special I/O Units, Optical I/O Units, Remote Terminals, etc., at the
lower end.
peripheral device
Devices connected to a PC System to aid in system operation. Peripheral
devices include printers, programming devices, external storage media, etc.
port
A connector on a PC or computer that serves as a connection to an external
device.
present value
The current value registered in a device at any instant during its operation.
Present value is abbreviated as PV.
printed circuit board
A board onto which electrical circuits are printed for mounting into a comput-
er or electrical device.
Содержание SYSMAC C200H
Страница 1: ...OPERATION MANUAL C200H CPU01 E 03 E 11 E SYSMAC Programmable Controllers Cat No W130 E1 05 ...
Страница 2: ...C200H Programmable Controllers CPU01 E 03 E 11 E Operation Manual Revised June 2003 ...
Страница 3: ...iv ...
Страница 5: ...vi ...
Страница 8: ...TABLE OF CONTENTS ix Glossary 345 Index 363 Revision History 369 ...
Страница 342: ...336 Programmer Program Date Page Word Contents Notes Word Contents Notes Data Storage ...
Страница 374: ...Cat No W130 E1 05 C200H Programmable Controllers CPU01 E 03 E 11 E OPERATION MANUAL ...