PART 2: CX-Server PLC Tools
OMRON GLOSSARY OF TERMS – CX-Server PLC Tools
CX-Server PLC Tools_ Page 179
Program memory An area of PLC memory reserved for the storage of programs.
Program mode PLC mode of operation during which the device can be programmed.
Programmable Read Only Memory
An area of memory which can be updated with programs and data only once after
manufacture; once this area has been written to, it can only be read, not modified.
Project OMRON configuration file inherited from the invoking application.
Refer also to CX-Server Project.
PROM writer A device which writes the programs and data into PROM.
PROM Programmable Read Only Memory.
Protocol A set of rules governing the transmission of data.
PSTN Public Switched Telephone Network.
Public Switched Telephone Network
A communications network carrying voice and data communications over switched
lines.
Rack The apparatus to which a unit is fixed.
RAM Random Access Memory.
Read mode PLC mode which allows data from the PLC to be read but not modified.
Read/write mode PLC mode which allows data to be read from and written to the device.
Refresh parameter table A table identifying the words in a Data Link to be refreshed for an individual PLC.
Registered IO Table The internal PLC table: this is the one used by the PLC when running, regardless of the
state of the actual hardware. It can be read and, for CV-series PLCs, written to by the
CX-Server software.
Relay network address The end network address which a PLC communicates.
Relay node number The number of the network node through which a transmission must pass to reach
another network.
Relay table A table containing the relay network addresses, node numbers and end network
addresses used within a FINS system.
Remote network A network beyond the LAN to which access must be gained through a gateway or
bridge.
Remote Terminals Further units that can be supported by CX-Server via the Sysmac-Bus Master unit
Reset Turning a bit or signal OFF or changing it to its set value or to zero.
Root The highest level of a directory.
Root group The highest level group in a CX-Server project.
Rotary switch Indicates the method of calling a device by generating a series of pulses.
Routing table A table containing the information necessary to allow communications between
different networks including local and gateway network address details.
Routing The direction of data across a network from its source to its destination.
RS232 Industrial interface standard for serial communications.
RS422 Industrial interface standard for serial communications employing balanced line
circuits.
RTs Remote Terminals.
Run Mode PLC mode of operation during which device information is typically read-only.
Serial Connection A direct connection between computer and PLC.
Server application An application that can be used to view or interact with.
Refer also to DDE and OLE.
Server 1. Server is used in DDE functions to contain a link to an outside application. Using
DDE functions, CX-Server allows the manipulation of an outside application as
specified as the Server.
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