The clever and sustainable alternative to the weighing terminal

Conveyor belt scales are used wherever material quantities are to be recorded on conveyor belts. These typically consist of a belt scale, a speed sensor and weighing electronics. As an integral part of SIMATIC ET 200SP, the SIWAREX WP341 weighing module integrates this measurement task completely and seamlessly for belt scales, weighfeeders, and solids flowmeters into the automation environment.

Industry Mall

Select and order

The intelligent technology module measures the signals of the load cells and speed sensors directly wired to the SIMATIC ET 200SP Base-Unit; calculates the main process values like flow rate, belt load, belt speed, and six totalizers; and provides all these to the connected controller. Standalone weighing terminals in the field therefore can be replaced completely, becoming a thing of the past.

The web server integrated in the module that can be used for commissioning and servicing purposes as an alternative to the HMI.


In combination with the digital junction box SIWAREX DB, completely new opportunities in the area of service and diagnostics are available. Up to four analog standard load cells can be connected to the SIWAREX DB. The load cell signals are directly digitalized inside the junction box and transferred to the SIWAREX WP341. Therefore every load cell can be monitored and diagnosed independently. Besides the load cell signal voltage, advanced diagnostic data like resistance, excitation current, sense voltage as well as a wire break detection for every single cell is provided. Occurring errors are reported channel-granular to the PLC. The compensation of different load cell output signals (corner load compensation / load cell balancing) can also be performed conveniently and digitally without potentiometers or solder resistors.


The whole performance of SIWAREX WP341 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 a smart alternative to “black-box” weighing terminals.

Continuous weighing with high accuracy offered by the SIWAREX WP341


  • Ultra-compact: 20 mm width, 65 mm height
  • Fast and detailed troubleshooting in combination with the digital junction box SIWAREX DB
  • High-accuracy load and speed measurement 
  • Easy connection to Profinet, Profibus, Ethernet IP- and Modbus TCP/IP-based controllers via SIMATIC ET 200SP Interface Modules
  • Web server for comfortable service and commissioning
  • Calculation of the main process values like belt load, belt speed, flow rate, six independent totalizers, and advanced diagnostic data



Conveyor belt scales, solids flowmeter, and weighfeeders

3× DI (24V DC); 3× DQ (24V DC); 1× RJ45; 1× RS485; 1× CI
Ambient temperature
–30 … +60 °C
Supported controllers
SIMATIC S7-300, S7-400, S7-1200 and S7-1500; Modbus TCP/IP- and Ethernet IP-based
Load cell interface
1000 Hz sampling rate; 10 V supply voltage; 0-4mV/V load cell sensitivity
Part Number

Download, Support, Services

Find downloads, support and services for Siemens Weight Measurement

The fastest way to the experts

Proposed solutions for your queries and direct access to our experts in Technical Support.

Service offers

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.

Service catalog

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.


How can we help you?

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.

Your direct line to Siemens

Contact your regional partner