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Siemens AG
Entry type: Application example Entry ID: 109483740, Entry date: 05/03/2016
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Communication between two LOGO! Controllers by means of LOGO! CMR and SMS

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  • Associated product(s)
In order to supply a remote, elevated region with water, a water reservoir is installed and filled by a pump in the valley. The pump is to be switched on and off, depending from the filling level of the water reservoir.

The following requirements must be fulfilled:

  • The pump is switched on when the water reservoir is nearly empty.

  • The pump is switched off time-controlled or at the latest when the water reservoir is full.

  • The operator is to be able to read the filling level of the water reservoir at any time via remote access.

Solution
For this task, the use of the LOGO! 8 controller and the LOGO! CMR communication module by SIEMENS is very suitable.

Figure 1

A LOGO! 8 controller and a LOGO! CMR communication module are installed both in the valley as well as on the mountain. With the aid of LOGO! CMR both controllers can communicate with each other via SMS.
The filling level of the water reservoir is monitored via four commercially available floats.

Mountain station requests water
A low filling level is detected by means of the bottom float. The mountain station sends an SMS to the valley station and requests water. A pump is controlled with the help of a contactor via an output of the LOGO! in the valley station and water is pumped to the mountain station. When the specified time is up, the pump switches off automatically. The valley station acknowledges the request via SMS.
If the valley station does not respond within a certain time, the mountain station sends a second SMS. If there is also no response to the second text message, an error is output and the operator is informed via SMS.

Mountain station requests the pump to be switched off
If the top float detects that the water reservoir is full, the mountain station sends an SMS to the valley station to switch off the pump. The pump is then switched off by the valley station before the fixed time is up. The valley station acknowledges the request via SMS.
If the valley station does not respond within a certain time, the mountain station sends a second SMS. If there is also no response to the second text message, an error is output and the operator is informed via SMS.

Operator requests the filling level
The operator requests the filling level of the water reservoir via SMS. The mountain station replies with the current filling level via SMS.

Downloads
  Documentation (1,6 MB)
 Registrierung notwendig  Example projects and configuration files (61,6 KB)


Additional Keywords
Cross communication, remote


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