Sunday, July 29, 2012

Wireless Data Communication via GPRS with S7-1200 and CP 1242-7, Scenario 1


Problem   In a stormwater retention basin, excess water is stored to relieve the sewer system. There is a continuous filling level measurement in the stormwater retention basin. An electronically controlled sluice S1 is opened as soon the capacities in the sewage system allow it. The automated plant should be coupled wireless with a control room and should fulfill these requirements for the communication:
  • The measured level will be sent cyclically from the Remote Station to the Central Station
  • In case of maintenance or critical filling levels in sluice S1, an alarm will be sent immediately from the Remote Station to the Central Station
  • The sluice S1 can be opened and closed manually via the Central Station
The wireless data transmission is done via GPRS. A standard PC or ICP will be used as platform for the Central Station. Visualization and operation of the process in the Remote Station will be achieved via a standard HMI-system also installed at the Central Station. A continuously archiving of the process values in the Central Station for further processing is required.
Solution 
This application example (configuration example CE-X21, Scenario 1) shows how the given tasks can be solved with SIMATIC components. The focus is on the GSM/GPRS Modem CP 1242-7 GPRS, the automation system SIMATIC S7-1200 and the Telecontrol Server Basic Software, which allow the communication between Remote Stations and the Control Room (Central Station) based on GPRS.

Central station
The Central Station consists of a Box PC SIMATIC IPC627C (2). The software components Telecontrol Server Basic (3) and WinCC flexible 2008 (4) are installed on the Box PC. The power supply is provided via a SIMATIC PM1207 Power module (1). The IPC is connected to the Internet via a standard DSL-Router.
Remote station
A GSM/GPRS Modem CP 1242-7 GPRS (2) is coupled via a bus interface to the SIMATIC S7-1200 controller 1211C (3). The GSM/GPRS Modem has a SIM card (5). For coupling with the air interface a quad band GSM/GPRS antenna ANT 794-4MR (4) is used. The power supply of all components is provided via a SIMATIC PM1207 power module (1).


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