Weighing module SIWAREX U

The SIWAREX U is a versatile weighing module for all simple weighing and force measuring tasks. It is either used centrally in a SIMATIC S7-300 or decentrally linked via PROFIBUS-DP to an S7-400, SIMATIC S5 or systems of other manufacturers. With SIWAREX U and further standard components from the SIMATIC range, we can offer you the optimum hardware and software environment. If, for example, a 1 or 2-channel SIWAREX U is used with the SIMATIC CPU 312 C, the result is a very cost effective, freely programmable weighing system with a total of ten digital inputs and six digital outputs.

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  • Uniform design technology and consistent communication in SIMATIC

  • Measurement of weight or force with a high resolution of 65000 parts and an accuracy of 0.05%

  • Space saving through use of two-channel version for two Scales

  • Direct connection of a remote display to the TTY interface

  • Theoretical adjustment without adjustment weights

  • Replacement of module without renewed adjustment of scale

  • Simple Parameterizing with SIWATOOL

  • Intrinsically-safe load cell supply for the hazardous area zones 1,2 (optional)

  • Can be used for Ex-applications


 Integration in automation systems S7-400, PCS7, C7,  IM151-7 CPU
Via ET 200M; Direct integration 
 in S7-300
 Communication interfaces
 SIMATIC S7 (P-Bus), RS 232, 
Error limit
 0.05 %
 Internal resolution
Number of measurements/second
 ATEX 95, FM, CULUS Haz. Loc.

Typical applications: filling levels in storage silos and containers, for monitoring crane loads, measuring conveyor belt loads, overload protection for industrial lifts or mill trains

In general anywhere, where weights need to be recorded and transferred to the automation system for processing as quickly as possible, with no bias and without the need for an additional interface

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Safety is key in the process industries. A failure in instruments relevant for safety may have serious implications for humans, the process and the environment. Therefore, a wide range of our process instruments come with on-board safety features for maximum risk reduction.


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Whether you need to measure pressure, temperature, flow, level or weighing, Siemens has best-in-class instruments to suit the unique needs of your plant or application - along with a global network of technical support available 24 hours a day, 7 days a week. Our high-performance and cost-efficient range of industrial solutions also includes devices for valve positioning, process protection, recording, controlling, communication and more.

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