Control system for loss in weight feeder

Detailed overview of DE-CONscrew and Siwarex FTC

The following table gives you a comprehensive overview of the different or similar features of the DE-CONscrew and Siwarex FTC controllers for loss-in-weight feeders.

What are loss-in-weight feeders?

Loss-in-weight feeders are measuring devices that are used in many industrial processes to enable the accurate dosing of raw materials. These scales work on the principle of differential weight measurement and can deliver extremely precise results. They usually consist of one or more weighing hoppers, which are filled with the material to be dosed, and load cells that continuously record the weight changes throughout the dosing process. The data is transmitted to a control unit, which monitors and regulates the precise dosing of the material. Loss-in-weight feeders are often used in the chemical, pharmaceutical and food industries, where the precise composition of substances is essential. Their use ensures efficient and accurate dosing and helps to improve product quality and prevent material loss.


The function of the control unit for loss-in-weight feeders

The control system of a loss-in-weight feeder plays a crucial role in the correct dosing of the raw material. It monitors and regulates the entire dosing process to ensure that the desired amount of material is dispensed precisely. To do this, the control system continuously evaluates the data from load cells that record every change in the weight of the dosing system. This information is then used to determine the actuating variable of the dosing unit, which is used to control the required quantity of material to be dosed. At the same time, the filling of the dosing container is controlled by activating the corresponding refill units.
Otherwise, the control system continuously monitors the entire dosing process and can make adjustments to correct any deviations. In this way, the control system guarantees accurate dosing of the raw material and ensures efficient and high-quality production.

In the following overview, we take a closer look at the key features of the two control systems DE-CON and Siwarex.

The overview


Siwarex FTC



General Data

  Siwarex FTC DE-CONscrew
Location Central / Decentral Central / Decentral
Availability   ex stock
Addtional required peripherals CPU, ET200, Cabinet, Power supply etc. Power supply
Compatible PLC systems S7-400, PCS7, S7-300 via ET200, etc. Any
Operation / Configuration / Diagnosis Siwatool Webserver
Alarm buffer yes yes
Baugruppentausch ohne erneute Justage möglich yes yes
Drive control Analog Analog or serial

Measurement technology

  Siwarex FTC DE-CONscrew
Load cells (DMS) yes (max. 6 pcs.) yes (max. 4 pcs.)
Load cells (Digital) - yes
Measurement rate up to 10 ms up to 5 ms
Internal resolution 24 Bit 24 Bit


  Siwarex FTC DE-CONscrew
P-Bus yes -
RS485 1 3
RS422 - 1
Ethernet - 2

Supported protocols

  Siwarex FTC DE-CONscrew
Profinet - * yes
Profibus - * yes
Modbus TCP - * yes
Ethernet IP - * yes
EtherCAT - * on request
RK512 - * yes
OPC UA - * yes
Serial fieldbus - * yes

* depends on add. peripherals

Digital/Analog In- and Outputs

  Siwarex FTC DE-CONscrew
Digital in- / Outputs 7/8 4/4
Digital counter 1 1
Analog In- / Outputs 0/1 (12 Bit) 1/1 (16 Bit)
Digital / Analog I/O's configurable ja ja

* Info based on SIWAREX_FTC_L_Kurzanleitung_V3.1.doc; 05/2010

Loss-in-weight feeders: a conclusion

Siwarex FTC offers numerous advantages for the user. Thanks to its SIMATIC design, it can be easily integrated into the SIMATIC automation system. This means that the features of the automation system, such as integrated communication, diagnostic system and project planning tools, can be used. In addition, the Siwarex FTC offers extensive recording and diagnostic options that enable detailed analysis of measurement data. Pre-configuration and a software tool for operation via PC can simplify installation and commissioning.
The DE-CON control system is characterized above all by its independence from the control system and the possibility of being used as a ready-to-connect unit directly on the dosing device. Of course, it can also be installed in the control cabinet and, thanks to a large number of standard integrated protocols, it can be easily integrated into existing control systems. In addition, the user can be guided through the most important points of commissioning quickly and easily via the web server - no additional software is required.  The ability to connect both analog and digital load cells, availability from stock and free support during implementation round off the offer.

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