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Glossary
351
instruction
A direction given in the program that tells the PC of an action to be carried
out, and which data is to be used in carrying out the action. Instructions can
be used to simply turn a bit ON or OFF, or they can perform much more com-
plex actions, such as converting and/or transferring large blocks of data.
instruction block
A group of instructions that is logically related in a ladder-diagram program.
Although any logically related group of instructions could be called an instruc-
tion block, the term is generally used to refer to blocks of instructions called
logic blocks that require logic block instructions to relate them to other in-
structions or logic blocks.
instruction execution time
The time required to execute an instruction. The execution time for any one
instruction can vary with the execution conditions for the instruction and the
operands used within it.
instruction line
A group of conditions that lie together on the same horizontal line of a ladder
diagram. Instruction lines can branch apart or join together to form instruction
blocks.
interface
An interface is the conceptual boundary between systems or devices and
usually involves changes in the way the communicated data is represented.
Interface devices such as NSBs perform operations like changing the coding,
format, or speed of the data.
interlock
A programming method used to treat a number of instructions as a group so
that the entire group can be reset together when individual execution is not
required. An interlocked program section is executed normally for an ON ex-
ecution condition and partially reset for an OFF execution condition.
interrupt (signal)
A signal that stops normal program execution and causes a subroutine to be
run.
Interrupt Input Unit
A Rack-mounting Unit used to input external interrupts into a PC System.
inverse condition
A condition that produces an ON execution condition when the bit assigned
to it is OFF, and an OFF execution condition when the bit assigned to it is
ON.
I/O capacity
The number of inputs and outputs that a PC is able to handle. This number
ranges from around one hundred for smaller PCs to two thousand for the
largest ones.
I/O Control Unit
A Unit mounted to the CPU Rack in certain PCs to monitor and control I/O
points on Expansion I/O Units.
I/O devices
The devices to which terminals on I/O Units, Special I/O Units, or Intelligent
I/O Units are connected. I/O devices may be either part of the Control Sys-
tem, if they function to help control other devices, or they may be part of the
controlled system.
I/O Interface Unit
A Unit mounted to an Expansion I/O Rack in certain PCs to interface the Ex-
pansion I/O Rack to the CPU Rack.
I/O Link
Created in an Optical Remote I/O System to enable input/output of one or
two IR words directly between PCs. The words are input/output between the
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 ...
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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 ...