Siemens SIWAREX WP241 Weighing Module for Belt Scales in PLC Networks


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Siemens' SIWAREX WP241 is a connected module for continous weighing applications, like belt scales and solids flowmeters. It includes four 24 VDC digital inputs, four 24 VDC digital outputs, and one 0/4-20 mA analog output. WP231 electronics connect to the SIMATIC S7-1200 automation system vial backplane bus and can connect to an operator panel or PLCs via Ethernet Modbus TCP/IP or RS-485 Modbus RTU. IP20 enclosure, UL, ATEX Zone 2, approvals.

Territory Restriction: Due to our territory agreement with Siemens, Lesman is the authorized Siemens sales representative in Illinois, Indiana, Wisconsin, Eastern Missouri, Michigan's Upper Peninsula, Paducah KY area, Oregon, Washington, Northern Idaho, Western Montana, Alaska, and Hawaii. If you are outside that area, you can find your local sales office or get technical assistance by calling 800-365-8766 or 972-522-4500, or sending an email to

SIWAREX WP241 is a weighing module designed for SIMATIC S7-1200 integration via the Totally Integrated Automation (TIA) Portal engineering platform. Ethernet and RS485 interfaces with Modbus protocol lets you integrate the SIWAREX WP241 into different control systems. SIWAREX WP241 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.

SIAREX WP241 is factory calibrated and comes with zeroing and taring functions. Automatic calibration functions let you adjust the the scale without adjustment weights, and replace modules without the need to readjust the scale.

  • Commissioning using SIWATOOL V7 for parameter assignment, belt scale adjustment, using function block in SIMATIC S7-1200 CPU touchpanel, via Modbus TCP/IP or Modbus RTU
  • Integrated terminals for up to 4 load cells with high signal resolution up to ±4 million parts
  • Four digital inputs, four digital outputs, one analog output
  • Simulates speed and belt load for test purposes
  • Power supply, load cells, RS-485 interface, digital I/O and analog output connect via screw plug in the weighing module; Includes RJ-45 plug for Ethernet
  • Comprehensive diagnostics standard
  • Suitable for use in Zone 2 hazardous areas
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