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PART 2: CX-Server PLC Tools
OMRON
GLOSSARY OF TERMS – CX-Server PLC Tools
CX-Server PLC Tools_ Page 175
Destination node
The node (and therefore device) where transmitted data is to be placed.
Device group
A class of devices which share similar properties, each group can be sub-divided into
device types.
Device type
A type of OMRON PLC.
Device
A type of OMRON automation device, either a PLC, Temperature Controller, Memory
Card Writer or PROM Writer.
Dialog
A window asking for some form of response from the user, usually in the form of either
entering requested information, selecting displayed data, or confirming an operation.
DLL
Dynamic Link Library. A program file that although cannot be run stand-alone as an
executable, can be utilised by one or more applications or programs as a common
service. DLL files have a *.DLL extension. DLL’s comprise a number of stand-alone
functions.
Double Floating Point
Double Floating Point (LREAL) type is as the IEEE754 Double precision (1.7E
+308/-307) as defined by Microsoft®.
Download
Refer to Transfer to PLC.
Drag
The act of moving an item on the screen by selecting it with the mouse, and keeping the
mouse button depressed, moving the mouse until the item has reached the required
location. The mouse button is then released.
Driver
The software which controls the communications between a computer and PLC,
translating any information passed between them into a format that the receiving
Device can understand.
Dynamic Data Exchange
The method of transferring data (and possibly instructions) between applications via
the establishment of reference links between them.
Echo test
The reflection of a signal along a communications channel in order to check the
accuracy of data transmission by comparing the received data against the original data
at the sending end.
EEPROM
Electrically Erasable Programmable Read Only Memory.
Elements
The number of address units which start at a specified data location.
End Connection
The final communication link between computer and PLC, or in the case of a Network
configuration, gateway PLC to PLC.
End network address
The address of the destination network to which communications are directed.
Error status
An indication of an error condition found in a system.
Ethernet
A 10 MB baseband local area network with each Device attached to the network having
equal status and therefore the ability to transmit as, and when, required (provided the
line isn’t busy).
Even parity
The number of 1s in a data transmission is even.
Event frame
A structure, predetermined by a protocol, containing specific fields for the transmission
of data.
Exclusive mode
PLC mode which allows an application exclusive access to the Device.
Expansion memory
The memory available to a CPU in addition to conventional memory.
File memory
An area of CPU memory allocated to the storage of data.
File Transfer Protocol
Protocol for transferring files between host computers.
FINS
Factory Intelligent Network Service.
FinsGateway
An OMRON communication type supported by CX-Server.
Flag
An indicator representing the condition of a process, data area or Device.
Floating Point
A data format supported by CX-Server.
Folder
A structure which organises the files in computer memory or on disk. Also known as a
‘directory’.
Frame length
The waiting time before data is transmitted across the network
FTP
File Protocol Transfer.
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