PART 2: CX-Server PLC Tools
GLOSSARY OF TERMS – CX-Server PLC Tools OMRON
CX-Server PLC Tools Page 178
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 Ethernet 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.
Polling Interrogating a device to check its operational status or whether it is ready to send or
receive data.
Port A device connection point allowing data entry and exit.
Program A set of instructions which are performed by a computer or PLC.
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