PART 2: CX-Server PLC Tools
GLOSSARY OF TERMS – CX-Server – PLC Tools User Manual
OMRON
CX-Server PLC Tools_Page 152
Network parameters
Network settings including information such as the maximum number of nodes
permitted on a network and the waiting times between transmissions.
Network Service Board
An interface which connects devices (not PLCs) to the network.
Network
1. Part of the PLC configuration, based on the device type. The number of
Networks available is dependant on the device type.
2. A number of computers linked together with a central processing point known as a
Server which is accessible to all computers. Networks affect CX-Server in that
further Network associated options are available if the computer is Network
connected.
Node number
Number identifying the device located at a particular node on the network. The
number can be between 1 and 126, the maximum number of nodes available on an
OMRON network.
Node
A position at which a device can be located on the network, consisting of a link unit
mounted to a device or PLC which in turn interfaces with a peripheral device or a
computer.
NSB
Network Service Board.
Odd parity
The number of 1s in a data transmission is odd.
Offline
The status of a device when it is not being controlled by a computer (although it may
be physically connected to it).
OLE
Object Linking and Embedding. Used to transfer and share information between
Microsoft Windows based applications and accessories.
Online
The status of a device when it is under the direct control of a computer.
Output Bit data area
An area of PLC memory reserved for output bits.
Output bit
The location within memory indicating the status of an output device.
Output device
A device which receives signals from a PLC.
Output
The signal sent from a PLC to an external device.
Packet
A unit of information transmitted across the network containing source and destination
address information together with the actual data.
Parity bit
A bit transmitted with a packet of data indicating the type of parity check to be
performed.
Parity
A type of validation check performed on transmitted information; data can be tested
for either even, odd, none, mark or space parity. The type of parity check involved is
indicated by the status of the parity bit.
Path
The location of a file including the drive, directory name plus any subdirectories and
the file name together with its associated extension.
Peripheral
A device which aids system operation rather than being central to its functioning.
Performance Monitor tool
A CX-Server tool for monitoring communications throughput and for displaying
CX-Server’s current performance level (i.e. a check to see if CX-Server is becoming
overloaded).
Ping test
A standard Ethenet communications test.
PLC
Programmable Logic Controller.
PLC Clock tool
The PLC Clock Tool provides a facility to monitor and set the PLC clock and
synchronise the PLC clock to the PC clock.
PLC Error component
This CX-Server component displays and manages PLC errors.
PLC Memory component
This CX-Server component allows the user to view, edit and monitor either channels
(words) or individual bits in areas of the PLC.
PLC Setup component
This CX-Server component permits the configuration of PLC settings.
Point
A point is used to hold a value of a predefined type - Boolean, Integer, Text, etc.
The contents of a point may be controlled by an object or I/O mechanism such as
DDE. The contents of a point may control the action or appearance of an object, or
be used for output via an I/O mechanism.
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