The compact weighing electronic for highest precision

SIWAREX WP351 is the right choice for many demanding weighing applications, either for producing accurate mixtures, ensure precise filling or legal-for-trade bagging, checking, totalizing or dosing. SIWAREX WP351 can be used in automatic as well as in non-automatic weighing applications. 

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Due to the intelligent firmware the weighing process is controlled autonomously directly from the module. Besides that, the high-speed sampling rate and processing time of 1.000 Hz guarantee best performance and repeatability. 


The connection of standard load cells according to the strain gauge principle avoids any manufacturer dependence and thus there is a large range of compatible, worldwide known and proven sensors available, which can be used.


The whole performance of SIWAREX WP351 is packed in an ultra-compact design. With a width of only 20 mm and a height of 65 mm it is one of the smallest weighing electronics worldwide.


Due to the seamless integration into the ET 200SP system it can be directly connected to SIMATIC PLC systems such as S7-300, -400, -1200 and -1500, which makes it to a smart alternative to “black-box” weighing terminals.


The ET 200SP interface module IM155-6MF HF enables an easy connection to Ethernet IP or Modbus TCP based automation systems.


Certified for legal-for-trade operation according OIML R-51, R-61, R-76 and R-107.

Functionality and precision at once with SIWAREX WP351


  • Ultra-compact: 20 mm width, 65 mm height
  • Fast: reaction time of digital outputs < 1 ms
  • Highly accurate: resolution +/– 20.000.000 parts, up to 3 x 6000d multi-range/multi-interval scale; 0,4µV/e
  • User-friendly due to webserver for service and commissioning
  • Legal-for-trade in accordance to OIML R-51, R-61, R-76 and R-107
  • Seamless integration in different automation systems 
  • Various communication interfaces ex-works
  • “Ready-to-use” HMI interface and function block


Integration in automation systems

SIMATIC S7-300, S7-400, S7-1200 and S7-1500;

Ethernet IP/Modbus TCP based systems via ET 200SP IM155-6MF HF

Communication interfaces
3x DI (24V DC); 3x DQ (24V DC);
1x RJ45; 1x RS485; 1x CI
Internal resolution
+/– 20.000.000 parts
Sample rate

Typical applications: Automatic (non-/legal-for-trade) filling, bagging, totalizing, and check-weighing scales, non-automatic (non-/legal-for-trade) scales such as platform or hopper scales.

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To remain competitive, companies in industry must ensure – and ideally increase – the availability and productivity of machines and plants. As your partner, we offer a unique range of services and support based on our extensive technology and industry expertise.

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As your partner, we offer a unique range of services and support based on our extensive technology and industry expertise. With our offerings, you can expect a high degree of reliability and a successful digital future for your company.

Well trained for excellent handling

Receive standardized or individual expertise directly from the manufacturer – with training centers in more than 60 countries.

Safety integrated

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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Whatever your process challenge - SITRANS WP351 has you covered

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.