Scada System Components; Control Center - Scada Manager; M-Opc - Motorola V186 - Cell Phone - GSM System Planner Manual

SCADA System Components

Control Center – SCADA Manager
Supervisory Control And Data Acquisition (SCADA) originally described a monitor and
control process wherein all intelligence resided in a central computer (the SCADA
Manager). The human operators would manage the system by observing the data as
presented on the computer's terminal(s).
FEP
The SCADA Manager in most cases consists of a personal computer(s), the software
package on that computer, the configuration files/screens created for the system and an
interface assembly between the computer system and the communication system—this
interface is the Front End Processor (FEP). Commonly, the FEP is isolated and the term
SCADA Manager is used instead to describe the computer, software, etc.; that convention
will be used hereafter.
The SCADA Manager typically does not support the MDLC protocol; the SCADA
Manager might not support conventional, trunked, or data radio; it might not support
LAN or dial-up. The FEP provides this support and passes data to the SCADA Manager.
The SCADA Manager "assumes" it is communicating with the field units but is truly
communicating only with (or through) the FEP. The technology used within the FEP is
necessarily different according to the connectivity available in the SCADA Manager.

M-OPC

OPC defines an open industry-standard interface based on OLE and ActiveX technology
that provides interoperability between different field devices, automation/control and
business systems. The OPC specification defines a set of interfaces for easy to use objects
including methods and properties to manipulate these objects. The basic transport layer
for OPC is DCOM and therefore, a Man-Machine Interface (MMI) or supervisory control
and data acquisition (SCADA) software package can process and collect data from OPC
servers that are running on different computers in the network. The specification also
defines a standard mechanism to access named data items contained in an OPC server.
Motorola used the OPC specification to build the M-OPC server. This server enables
exchange of information over the communication system between SCADA managers (or
any other application) and Motorola RTUs.
The M-OPC software package comprises:
• M-OPC server
• M-OPC client interface
• MDLC communications driver
• M-OPC Monitoring and Setup Tool
• Security Administration Tool
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