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Application and functions
1.6 Communications services
Protocols for communication with a master station
Depending on the loaded firmware variant, the RTU supports one of the following protocols
for communication with a master station:
● TeleControl Basic
This is a proprietary protocol of Siemens for telecontrol applications.
The IP-based communications protocol is used to connect the RTU to the application
TCSB. TCSB is installed on a PC in the master station, the telecontrol server. For the
version, see section Scope of delivery, accessories, requirements (Page 33).
Via the OPC-DA or OPC-UA server of TCSB, and OPC client can access the process
data of the RTU. For the TCSB manual, see /4/ (Page 296).
Apart from the RTU, several S7-1200 CPs also support the protocol. It allows especially
energy-saving operation since communications connections are only established
temporarily stop
● SINAUT ST7
The RTU uses the ST7 protocol for communication with a master station TIM.
For communication with a PC application in the master station, the connection must run
via the master station TIM.
When communicating with a TIM module, the RTU uses the transfer protocol "MSCsec"
on the network layer (OSI layer 3). The MSC protocol cannot be used for communication
with a master station application.
● DNP3
The RTU functions as a DNP3 station (Outstation).
Communication is based on the DNP3 SPECIFICATION Version 2.x (2007/2009).
The RTU is certified for the DNP3 conformity levels Level 1 and 2, but also supports
higher conformity levels.
For secure communication via mobile wireless with the master, the RTU establishes a
VPN tunnel using OpenVPN, see section Security functions for communication
(Page 28).
When using the LAN interface select suitable means to make sure that there is secure
communication with the master, for example by using SCALANCE M routers.
According to the specification "Supplement to Volume 2 - SECURE AUTHENTICATION",
the RTU supports secure authentication, see section DNP3 (Page 175).
You will find a detailed overview of the attributes and properties specified in the DNP3
protocol and supported by the RTU in the DNP3 device profile, see /2/ (Page 295).
You will find the supported object groups and variations in the section Data points
(Page 183).
24
Operating Instructions, 09/2017, C79000-G8976-C382-04
RTU3030C
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