TM SIWAREX WP521 ST and WP522 ST
are ideal for platform scales, silo/bunker level monitoring, and
hazardous areas. They are technology modules compatible with the SIMATIC S7-1500 Advanced
Controller family. WP521 ST is a single-channel design for one-scale systems, while WP522 ST is a
two-channel design for two-scale systems.
Siemens - Process Instrumentation