Siemens TM SIWAREX WP321 ST Weighing Electronics


  • Uniform design technology and consistent communication in SIMATIC ET 200SP
  • Compact design with only 15 mm module width
  • Parameterization of the scales via the control panel, CPU or PC
  • Flexible configuration options in SIMATIC TIA Portal, SIMATIC STEP 7 and PCS 7
  • Measuring of weights and forces with a resolution of up to +/- 2 million parts
  • 100/120/600 Hz measurement rate
  • Internal scale monitoring of freely definable limit values
  • Easy commissioning using the SIWATOOL software
  • Automatic calibration is possible without the need for calibration weights
  • Modules can be replaced without recalibrating the scale
  • Direct use in ATEX Zone 2 possible
  • Wide range of status and diagnostic information
  • “Ready-for-use” sample program

Siemens TM SIWAREX WP321 ST Weighing Electronics offers versatility and adaptability, serving as a weigh beam that seamlessly integrates a static scale into the SIMATIC automation environment.


Integration in automation systems
SIMATIC S7‑300, S7‑400, S7‑1200 and S7‑1500 Via SIMATIC ET 200SP interface module (PROFIBUS or PROFINET)
Commissioning options Using SIWATOOL V7
Using function block in SIMATIC CPU / Touch Panel
Communication interfaces SIMATIC ET 200SP backplane bus
RS 485 (SIWATOOL, Siebert remote display)
Measuring accuracy
According to DIN 1319-1 of full-scale value at 20 °C ± 10 K (68 °F ± 10 K) 0.05%
Internal resolution ± 2 million parts
Measuring frequency 100 / 120 / 600 Hz
Weighing functions
Weight values Gross
Limit values 2 × min/max


Siemens TM SIWAREX WP321 ST Weighing Electronics_DpstarGroup