Connecting 
  6.9 Connection of a speed sensor 
SIWAREX WT241 
Manual, 05/2015, A5E36046748A  39 
6.9  Connection of a speed sensor 
If a speed sensor is connected to the WT241, this must always be made at digital input DI.0 
of the module. This input is factory-configured for operation as a pulse counter. Check this 
setting in data record 7 during commissioning. 
The DI.0 can be found on the PCB board in the connection area ④. 
Connection of the various Siemens speed sensors is shown below. A wide range of pulse 
sensors can be used up to a clock frequency of 5 000 Hz. A level of at least +15 V DC is 
required for the High signal. The Low signal is reached at a voltage of +5 V DC. 
Detailed information on the various sensors can be obtained from the respective manual. 
6.9.1  RBSS / WS100 speed sensor on WT241 
 
Figure 6-11  RBSS speed sensor on WT241