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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