USA - SIWAREX WP521 weighing module

Weighing Modules

SIWAREX WP521 ST and WP522 ST are weighing modules for the SIMATIC S7-1500 advanced controller family: SIWAREX WP521 ST is the single channel option for the set-up of one scale and SIWAREX WP522 ST is the two-channel option for the set-up of two independent scales. 

SIWAREX WP521 ST/WP 522 ST Catalog Specifications

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With SIWAREX WP521 ST and WP522 ST weighing modules, simple weighing applications such as platform or hopper scales can be seamlessly integrated into the S7-1500 automation system. The free “ready-for-use“ application helps to create fast and easily customer and application specific solutions. In addition, the service software SIWATOOL V7 is quick and easy to use. The integrated monitoring function of the load cells impedance as well as the process and diagnosis alarm functions optimize the plant security.


  • Seamless integration of platform and hopper scales into the SIMATIC S7-1500 automation environment

  • Uniform structure and universal communication through the integration in SIMATIC S7-1500

  • Integrated part of TIA portal

  • Resolution of up to +/- 4 million parts

  • Measurement rate of 100/120 Hz (effective interference suppression)

  • Automatic impedance control of the load cells, process and diagnostic alarms

  • Complete parameterization and commissioning via CPU, HMI panel or PC possible

  • Direct use  in hazardous zone 2


Basic scales, e.g. platform and hopper scales
Integration in automation systems
SIMATIC S7-1500 (central or distributed with ET200MP)
Other Systems via Modbus RTU or 
Modbus TCP/IP
Communication interfaces (on board)
SIMATIC S7-1500 system bus 
Per channel 1x RS485 (Modbus RTU, remote display)
Ethernet (Modbus TCP/IP,SIWATOOL)
Per channel 4x digital outputs (24V DC)
Per channel 3x digital inputs (24V DC)
Internal resolution
Up to +/- 4 million parts
Measuring rate
100/120 Hz
Article No.
WP521 ST : 7MH4980-1AA01
WP522 ST : 7MH4980-2AA01

Typical applications: gravimetric level measurement of silos and hoppers as well as for platform scales. Beside that the weighing modules can also be used for weighing applications in hazardous locations (with Ex-interface SIWAREX IS).

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