RS485
Appendix - 21
that information and functions are centered on Aspect
Objects.
Industrial
IT
Enabled
A product that is Industrial
IT
enabled has been verified
according to the process of Industrial
IT
certification. It has
the right to use the “Industrial
IT
enabled” symbol.
Loopback
A test used for checking functionality of a serial port, utilizing
a test plug that connects send, receive and handshaking
signals
Long Integer
Analog value consisting of two consecutive 16-bit registers
LRC
Longitudinal Redundancy Check
Measurement
A measurement is a value computed by the controller
through its analog and digital inputs. Measurements can be
read from the controller front plate, or through the Modbus
protocol.
Modbus adapter
It is an optional small interface module through which the
controller 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 a parameter.
OPC
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 Servers
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.
OPC Clients
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.
Parameter
A parameter is an operating data for the controller.
Parameters can be read and programmed with the front
plate of the controller, or through the Modbus protocol.
Parity
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.
PC
Personal Computer
PLC
Programmable Logic Controller
