Glossary
347
Control System
All of the hardware and software components used to control other devices.
A Control System includes the PC System, the PC programs, and all I/O de-
vices that are used to control or obtain feedback from the controlled system.
controlled system
The devices that are being controlled by a PC System.
control signal
A signal sent from the PC to effect the operation of the controlled system.
counter
A dedicated group of digits or words in memory used to count the number of
times a specific process has occurred, or a location in memory accessed
through a TC bit and used to count the number of times the status of a bit or
an execution condition has changed from OFF to ON.
CPU
An acronym for central processing unit. In a PC System, the CPU executes
the program, processes I/O signals, communicates with external devices,
etc.
CPU Backplane
A Backplane which is used to create a CPU Rack.
CPU Rack
Part of a building-block PC, the CPU Rack contains the CPU, a power sup-
ply, and other Units. With most PCs, the CPU Rack is the only Rack that pro-
vides linkable slots.
CTS
An acronym for clear-to-send, a signal used in communications between
electronic devices to indicate that the receiver is ready to accept incoming
data.
cycle
The process used to execute a ladder-diagram program. The program is ex-
amined sequentially from start to finish and each instruction is executed in
turn based on execution conditions.
cycle time
The time required for a single cycle of the ladder-diagram program.
data area
An area in the PC’s memory that is designed to hold a specific type of data,
e.g., the LR area is designed to hold common data in a PC Link System.
Memory areas that hold programs are not considered data areas.
data area boundary
The highest address available within a data area. When designating an oper-
and that requires multiple words, it is necessary to ensure that the highest
address in the data area is not exceeded.
data sharing
An aspect of PC Link Systems and of Data Links in Net Link Systems in
which common data areas or common data words are created between two
or more PCs.
debug
A process by which a draft program is corrected until it operates as intended.
Debugging includes both the removal of syntax errors, as well as the
fine-tuning of timing and coordination of control operations.
decimal
A number system where all numbers are expressed to the base 10. In a PC
all data is ultimately stored in binary form, four binary bits are often used to
represent one decimal digit, via a system called binary-coded decimal.
decrement
Decreasing a numeric value.
Summary of Contents for SYSMAC C200H
Page 1: ...OPERATION MANUAL C200H CPU01 E 03 E 11 E SYSMAC Programmable Controllers Cat No W130 E1 05 ...
Page 2: ...C200H Programmable Controllers CPU01 E 03 E 11 E Operation Manual Revised June 2003 ...
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Page 8: ...TABLE OF CONTENTS ix Glossary 345 Index 363 Revision History 369 ...
Page 342: ...336 Programmer Program Date Page Word Contents Notes Word Contents Notes Data Storage ...
Page 374: ...Cat No W130 E1 05 C200H Programmable Controllers CPU01 E 03 E 11 E OPERATION MANUAL ...