Omron CS1W-SLK11-21 - 06-2004 Manual page 182

common data
constant
control bit
control signal
Control System
controlled system
CPU
CPU Bus Unit
CPU Rack
C-series PLC
CTS
CV Support Software
CV-mode
CV-series PLC
CVSS
cycle
cycle time
data area
data length
data link
Glossary
Data that is stored in a memory of a PLC and which is shared by other PLCs
in the same system. Each PLC has specified section(s) of the area allocated
to it. Each PLC writes to the section(s) allocated to it and reads the sections
allocated to the other PLCs with which it shares the common data.
An input for an operand in which the actual numeric value is specified. Con-
stants can be input for certain operands in place of memory area addresses.
Some operands must be input as constants.
A bit in a memory area that is set either through the program or via a Program-
ming Device to achieve a specific purpose, e.g., a Restart Bit is turned ON and
OFF to restart a Unit.
A signal sent from the PLC to affect the operation of the controlled system.
All of the hardware and software components used to control other devices. A
Control System includes the PLC System, the PLC programs, and all I/O de-
vices that are used to control or obtain feedback from the controlled system.
The devices that are being controlled by a PLC System.
See central processing unit.
A special Unit used with CS-series PLCs that mounts to the CPU bus. This
connection to the CPU bus enables special data links, data transfers, and pro-
cessing.
The main Rack in a building-block PLC, the CPU Rack contains the CPU, a
Power Supply, and other Units. The CPU Rack, along with the Expansion CPU
Rack, provides both an I/O bus and a CPU bus.
Any of the following PLCs: C2000H, C1000H, C500, C200H, C40H, C28H,
C20H, C60K, C60P, C40K, C40P, C28K, C28P, C20K, C20P, C120, or C20.
An acronym for clear-to-send, a signal used in communications between elec-
tronic devices to indicate that the receiver is ready to accept incoming data.
A programming package run on an IBM PC/AT or compatible to serve as a Pro-
gramming Device for CV-series PLCs.
A form of communications usable only with CV-series PLCs. See C-mode.
Any of the following PLCs: CV500, CV1000, CV2000, or CVM1
See CV Support Software.
One unit of processing performed by the CPU, including SFC/ladder program
execution, peripheral servicing, I/O refreshing, etc. The cycle is called the scan
with C-series PLCs.
The time required to complete one cycle of CPU processing.
An area in the PLC's memory that is designed to hold a specific type of data.
In communications, the number of bits that is to be treated as one unit in data
transmissions.
An automatic data transmission operation that allows PLCs or Units within
PLCs to pass data back and forth via common data areas.
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