5. CONFIGURATION
Figure 85: OPC DA Architecture
The figure above shows an architecture to communicate a SCADA system and PLCs in automation projects. All the roles
present on a communication are explicit on this figure regardless of the equipment in which it’s executed, since they can be
done in the same equipment or in various ones. Each of the roles of this architecture are described on table below.
Role Description
Programmable Controllers and
Field Devices Level
The field devices and the PLCs are where the operation state and
plant control information are stored. The SCADA system ac-
cess the information on these devices and store on the SCADA
server, so that the SCADA clients can consult it during the plant
operation.
Acquisition Network
The acquisition network is where the requests for data collected
by field devices travel, to request the data collected from the
field devices.
Gateway for PLC Communica-
tion
A gateway enables the communication between the OPC DA
Server and Nexto Series PLCs. A gateway in the same sub-
net of the PLC is always necessary, as described in chapter
Communication Settings of MasterTool IEC XE User Manual
– MU299609.
OPC Server Module
The OPC DA Server is a Module responsible of receiving the
OPC DA requests and translate them to the communication with
the field devices.
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