Siemens SIMATICS PCS7 brochure Migration of existing telecontrol systems, Third-party stations

© Siemens AG 2011

Migration

Migration of existing telecontrol systems

Units with Modbus communication SINAUT ST1 stations based on SIMATIC S5

The Modbus is widely used in automation plants due to its straightforwardness and openness. The Modbus telecontrol protocol can be used to implement both serial and TCP/IP com- munication links between a control center in SIMATIC PCS 7 and RTUs with a corresponding Modbus interface.

In this manner, existing units with a Modbus infrastructure can be integrated at low cost into the SIMATIC PCS 7 process control system. The RTUs of these units can be SIMATIC S7 controllers (SIMATIC ET 200S with integral CPU, SIMATIC

S7-300/S7-300F and SIMATIC S7-400/S7-400F) as well as third-party RTUs. Whereas RTUs with Modbus TCP/IP interface can be integrated directly, serial third-party RTUs require spe- cific interface converters for telecontrol communication.

Engineering data of third-party RTUs can be imported in CSV format into the PCS 7 TeleControl engineering (DBA). The sta- tus of the RTUs and the transmission paths is evaluated by the "Diagnostics Modbus RTU" block and displayed in the control center.

During the migration of existing systems, it is possible to inte- grate outstations based on SIMATIC S5 into the SIMATIC PCS 7 process control system using SIMATIC PCS 7 TeleControl. In the process, the ST1 telecontrol protocol is converted into the ST7 protocol in the central TIM communication module.

Third-party stations

In addition to the Modbus telecontrol protocol, the DNP3 (serial and TCP/IP), IEC 870-5-101 (serial) and IEC 870-5-104 (TCP/IP) telecontrol protocols basically also support the con- trol center linking of third-party RTUs when migrating existing systems. The implementation depends on whether the third- party RTU masters the corresponding protocol and whether the interface converters are available if necessary.

6,0$7,&3&6ZLWK6,0$7,&3&67HOH&RQWURO

Industrial Ethernet

IP-based

WAN

TIM

4R-IE

Classic

WAN

S7-400

S7-300

SINAUT ST7 stations

S5-115	S5-135/155
S5-100
SINAUT ST1 stations

G_PCS7_XX_00180

Integration of SINAUT ST1 stations into telecontrol communication

28Migration