Siemens SIWAREX WP241 Weighing Electronics


  • Uniform design technology and consistent communication in SIMATIC S7‑1200
  • Uniform configuration with TIA Portal
  • Operation without SIMATIC CPU possible
  • Direct connection of an operator panel via Ethernet
  • Four digital inputs and outputs, one analog output
  • Measurement of weight with a high resolution of ± 4 million parts
  • Simple adjustment of belt scales using the SIWATOOL V7 program via the Ethernet interface – even without knowledge of SIMATIC
  • Replacement of module possible without renewed calibration of the scale
  • Use in hazardous area zone 2
  • Different calibration methods: With test weights, test chain, automatically or via material batch.
  • Specification of belt inclination angle
  • 6 totalization memories
  • Simulation of speed and belt load for test purposes
  • Comprehensive diagnostics function

Siemens SIWAREX WP241 Weighing Electronics is a versatile weighing module designed for belt scales. This compact module can be effortlessly integrated into the SIMATIC S7-1200 automation system or operated independently as a stand-alone module, even without a SIMATIC CPU.


Communication interfaces SIMATIC S7‑1200 backplane bus
RS 485 (Modbus RTU)
Ethernet (SIWATOOL V7, Modbus TCP/IP)
Analog output 0/4 – 20 mA
4 × digital outputs, 24 V DC, floating, short-circuit proof
4 × digital inputs 24 V DC, floating
Commissioning options Using SIWATOOL V7
Using function block in SIMATIC S7‑1200 CPU / Touch Panel
Using Modbus TCP/IP
Using Modbus RTU
Internal resolution Up to ± 4 million parts
Measuring frequency 100 / 120 Hz
Approvals/certificates ATEX Zone 2



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