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Glossary
operand
The values designated as the data to be used for an instruction. An operand
can be input as a constant expressing the actual numeric value to be used or
as an address to express the location in memory of the data to be used.
operating error
An error that occurs during actual PLC operation as opposed to an initialization
error, which occurs before actual operations can begin.
optical communications
A communications method in which signals are sent over optical fiber cable to
prevent noise interference and increase transmission distance.
OR
A logic operation whereby the result is true if either of two premises is true, or
if both are true. In ladder-diagram programming the premises are usually ON/
OFF states of bits or the logical combination of such states called execution
conditions.
output
The signal sent from the PLC to an external device. The term output is often
used abstractly or collectively to refer to outgoing signals.
Output Block
A Unit used in combination with a Remote Interface to create an I/O Terminal.
An Output Block provides mounting positions for replaceable relays. Each re-
lay can be selected according to specific output requirements.
output device
An external device that receives signals from the PLC System.
output point
The point at which an output leaves the PLC System. Output points correspond
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.
Output Terminal
An I/O Terminal that provides output points.
overflow
The state where the capacity of a data storage location has been exceeded.
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 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.
parity check
Checking parity to ensure that transmitted data has not been corrupted.
PLC
An acronym for Programmable Controller.
PLC configuration
The arrangement and interconnections of the Units that are put together to
form a functional PLC.
PLC System
With building-block PLCs, all of the Racks and independent Units connected
directly to them up to, but not including the I/O devices. The boundaries of a
PLC System are the PLC 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.
PCB
An acronym for printed circuit board.
PLC Setup
A group of operating parameters set in the PLC from a Programming Device
to control PLC operation.
Содержание CS1W-SLK11-21 - 06-2004
Страница 1: ...Cat No W367 E1 02 SYSMAC CS1W SLK11 21 SYSMAC LINK Units...
Страница 2: ...CS1W SLK11 21 SYSMAC LINK Units Operation Manual Revised June 2004...
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Страница 170: ...153 Appendix B Dimensions CS1W SLK11 Optical SYSMAC LINK Unit Unit mm...
Страница 171: ...154 Dimensions Appendix B CS1W SLK21 Coaxial SYSMAC LINK Unit Unit mm...
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Страница 201: ...Authorized Distributor Cat No W367 E1 02 Note Specifications subject to change without notice Printed in Japan...
Страница 202: ...SYSMAC CS1W SLK11 21 SYSMAC LINK Units Cat No W367 E1 02 OPERATION MANUAL...