S7-based Telecontrol via DNP3 Protocol
The remote stations “Pipeline” and “Oil Tanks” must be controlled and monitored from a central control station.
Automation problem requirements:
- The control station must be capable of requesting process data from the outstations.
- The control station must be able to send commands and setpoint values unsolicited to the outstations.
- The outstations must be able to send process data to the control station unsolicited.
- In the case of a cancelled connection, process data must be saved in the outstations and be sent to the master after the connection has been established again.
- For the implementation, a standardized protocol must be used.
This application shows a complete configuration of a DNP3 system with SIMATIC components. The control station uses telecontrol protocol DNP3 to communicate with the outstation via Ethernet.
- At the control station, the WinCC TeleControl software is installed, which makes the control station the DNP3 master.
- An S7-300 CPU with TIM3V-IE DNP3 as DNP3 station is installed on outstation “Pipeline”.
- Outstation “Oil tanks” consists of an S7-1200 CPU and a CP 1243-1 DNP3. (The CP is responsible for the communication with the control station.)
The two following solutions were offered for the hardware configuration.
Configuration via internet/VPN
A Virtual Private Network (VPN) is configured for the master to communicate with the stations via the internet. In this example, a DSL connection is available at the master. In addition, a SCALANCE S612 VPN module is installed. In each of the outstations, a SCALANCE M874-3 UMTS and VPN router (incl. SIM card and antenna) is used, which establishes the VPN tunnel to the SCALANCE S612 in the control station. This enables a secure communication via the internet / mobile radio network.
Configuration via LAN
As an alternative for the solution via internet/VPN, the solution via a switch is offered. In this case, the master and the stations are connected via a local network (LAN). The figure below gives a schematic overview of the most important components of the solution:
The solution presented here offers you the following advantages:
- Using the standardized DNP3 protocol
- Efficient and secure monitoring and control of process engineering plants
- Homogenous SIMATIC solution since the SIMATIC Portfolio offers software and hardware for DNP3 master and outstations.
- Connection to all standardized DNP3 master systems
- Flexible expansion to up to 65519 outstations
Configure telecontrol stations in just a few steps with TeleControl Professional
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Remote control, WAN, Binary, Analog, Command, Counter, TD7