Weighing module SIWAREX WP521 ST / WP522 ST

Weighing module SIWAREX WP521 ST / WP522 ST

SIWAREX WP521 ST and WP522 ST are technology 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. Integrated in SIMATIC S7-1500 all advantages of the automation system can be used. The free “ready-for-use“ application helps to create fast and easily customer and application specific solutions. Besides that, the service software SIWATOOL V7 enables a quick and user-friendly. The integrated monitoring function of the load cells impedance as well as the process and diagnosis alarm functions optimize the plant security resp. plant availability.

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  • Seamless integration of  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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