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MAC address
Measurement
Modbus adapter
OPC
OPC Servers
OPC Clients
Parameter
Parity
PC
In computer networking, a Media Access Control address (MAC
address) is a unique identifier assigned to most network adapters
or network interface cards (NICs) by the manufacturer for
identification, and used in the Media Access Control protocol sub-
layer. If assigned by the manufacturer, a MAC address usually
encodes the manufacturer's registered identification number.
A measurement is a value computed by the controller through its
analog and digital inputs. Measurements can be read from the RVT
front plate, or through the Modbus protocol.
It is an optional small interface module through which the RVT is
connected to an external Modbus serial communication bus. It
performs an optical to RS485 conversion. The communication with
the Modbus adapter is activated with an RVT parameter.
OLE™ for Process Control. OPC is Plug-n-Play in the field of
Automation and HMI. OLE™ for Process Control (OPC™) is the
most standard way for connecting hardware and data devices
with HMI client applications.
OPC is a concept agreed upon by a committee of members from
the OPC foundation. Most automation companies in the market
place including ABB are members of this foundation. OPC uses
state-of-the art technologies like COM, DCOM, ActiveX of
Microsoft and makes development and programming easier.
In the OPC world, there are two major types of applications: OPC
Servers and OPC Clients.
OPC Server applications are used to collect data from the data
sources like hardware devices. At the bottom level, the servers are
mainly for reading inputs and writing outputs of the data sources.
At the upper level, the servers make the data available in a
standard way to the OPC client applications.
The OPC Client applications can communicate directly with the
OPC servers and get the data. This way OPC enhances the
interface between client and server applications by providing a
standard mechanism to communicate data from a data source to
any client application.
A parameter is an operating data for the controller. Parameters
can be read and programmed with the RVT front plate, or through
the Modbus protocol.
Simple method of data error checking performed at the byte level.
May be user-specified as Odd, Even or None with most equipment
and software.
Personal Computer
RVT communication ç Appendices - 79
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