USA - SIWAREX WP251 Weighing Module

Weighing Module

SIWAREX WP251 controls dosing and batching tasks completely independently while fulfilling the typical requirements of these processes, such as speed and accuracy. As part of the SIMATIC S7-1200 basic controller family, the WP251 can be integrated seamlessly into the TIA Portal.

SIWAREX WP251 Catalog Specifications

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The SIWAREX WP251 weighing module can be used with SIMATIC S7-1200 or without a SIMATIC CPU in stand-alone mode. Operation and commissioning of the scale are quick and easy with the free software example application "Ready-for-use SIWAREX WP251”. The commissioning, calibration and operation of the scale can be done completely via the CPU or Touchpanel – the SIWAREX WP251 function block doesn't require any additional programming! In combination with a SIMATIC S7-1200 basic controller, all customer and application specific requirements can be easily met. In the stand-alone mode all parameters and functions can be accessed and edited via the on board Modbus RTU or Modbus TCP/IP interface. A PC or any Modbus-compatible device can be directly connected and used for operation. In addition, the SIWAREX WP251 offers a trace function. All traced process values and status information of the scale can be illustrated and analyzed with SIWATOOL V7 and, if required, edited in spreadsheets.


  • Uniform structure and universal communication through the integration in S7-1200

  • Four digital in- and outputs, one analog output on board

  • Operation also possible without SIMATIC CPU

  • Flexible connections to different automation systems via on board Modbus RTU
    or  Modbus TCP/IP interfaces

  • High resolution of up to  +/- four million parts

  • Measuring rate of 100/120 Hz

Typical applications: non-automatic weighing applications, automatic gravimetric filling, automatic catchweighing, discontinuous totalizing, automatic checkweighing


Integration in automation systems
Other systems via Modbus RTU or
Modbus TCP/IP
Communication interfaces (on board)
SIMATIC S7-1200 Bus 
RS485 (Modbus RTU)
Ethernet (Modbus TCP/IP & SIWATOOL)
Internal resolution
Up to +/- 4 million parts
Measuring rate

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