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SIWAREX WP231 is the first weighing module for SIMATIC S7-1200 and through this is programmable via the Totally Integrated Automation (TIA) Portal engineering platform. The ability to operate SIWAREX WP231 with or without SIMATIC PLCs offers you the flexibility you need.SIWAREX WP231 offers four digital inputs and outputs and one analog output. All inputs and outputs are controllable via the SIWAREX module or via SIMATIC S7-1200.

The SIWAREX WP231 can be used in following applications:

  • Non-automatic scale according to OIML76
  • Level monitoring of silos and bunkers
  • Weighing in hoppers and platform scales
  • Suitable in hazardous application (with SIWAREX Ex-Interface IS



Integration in automation systems SIMATIC S7-1200
Other systems via Modbus RTU or ModbusTCP/IP
Communication interfaces SIMATIC Bus
EU type approval as non-automatic weighing machine, trade class III 0,05%
Calibratable yes
Internal resolution up to 4 million parts
Internal/external updating rate 10ms/100Hz



  • Uniform structure and universal communication through the integration in S7-1200
  • Four digital inputs and outputs, one analog output
  • Operation also possible without SIMATIC CPU
  • Easy commissioning via SIWATOOL or via HMI touch panel
  • Extensive diagnostic functions
  • Calibratable display
  • Flexible adjustment for different requirements
  • Theoretical adjustment without adjustment weights
  • Modules can be exchanged without read justing the scale