Application planning
4
4.1 Functions
The primary task of the electronic weighing system is the measurement and registration of the
current weight value. The integration in SIMATIC gives you the option to process the weight
value directly in the PLC (ProgrammabelLogic Controller).
The SIWAREX WP321 is calibrated at the factory. This allows for automatic calibration of the
scale without the need for calibration weights and replacement of modules without the need for
recalibrating the scale.
A PC for setting the parameters of the electronic weighing system can be connected via the
RS485 interface.
The SIWAREX WP321 electronic weighing system can also be used in potentially explosive
atmospheres (Zone 2). The load cells are supplied intrinsically safe in Zone 1 applications when
you use the optional Ex interface SIWAREX IS.
4.2 Parameter assignment options
4.2.1 Parameter assignment with the PC
You can set the scale parameters with the convenience of the familiar Windows interface by
using the "SIWATOOL" PC parameter assignment software.
You can use the program for commissioning the scale without any knowledge of automation
technology. When servicing is required, you can analyze and test the processes in the scale
independently of the automation system or Operator Panel with the help of the PC. You can
read out the diagnostic buffer from the SIWAREX module to assist you in the event analysis.
The figure below illustrates the structure of the individual program windows.
SIWAREX WP321
Operating Instructions, 08/2019, A5E33715669A-AD 19
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