2 of 19 FAQ Release 1.0 1- Q: How is the SIWAREX FTA calibrated with SIWATOOL FTA? A: Following hardware parts and software are requested to integrate a scale in SIMATIC. 24V Power supply, S7-300 CPU or ET200M Station, memory card for CPU, SIWAREX FTA front connector for SIWAREX FTA, SIWATOOL FTA software, RS232 cable, computer with Windows XP or higher and a calibration weight bigger than 5% of the sum of the nominal value of all load cells. Requested parts: 24V PS S7-3xx PLC or ET 200M SIWAREX FTA 7MH4900-2AA01 SIWATOOL RS232 Cable: Configuration Package for SIWAREX FTA 7MH4702-8CA 7MH4900-2AK01
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1- Q: How is the SIWAREX FTA calibrated with SIWATOOL FTA? A: Following hardware parts and software are requested to integrate a scale in SIMATIC. 24V Power supply, S7-300 CPU or ET200M Station, memory card for CPU, SIWAREX FTA front connector for SIWAREX FTA, SIWATOOL FTA software, RS232 cable, computer with Windows XP or higher and a calibration weight bigger than 5% of the sum of the nominal value of all load cells. Requested parts: 24V PS S7-3xx PLC or ET 200M SIWAREX FTA 7MH4900-2AA01
SIWATOOL RS232 Cable: Configuration Package for SIWAREX FTA 7MH4702-8CA 7MH4900-2AK01
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Adjustment weight Scale The operating environment shown below includes the following: PS207 2A power supply, ET200M Station, CPU317-2DP, SIWAREX FTA weighing module CP5512 communication card, SIWATOOL cable
SIWAREX FTA module
Load cell cable
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RS232 interface24V Power suply Connection terminal of the sensor
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Software: SIWATOOL FTA Start SIWATOOL FTA.
On the SIWATOOL FTA interface, select the desired interface, which should be the COM used on your computer.
Click Online.
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When the communication is established, Online turns grey.
Before calibrating, set the service mode to on (1).
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Click Adjustment parameter.
Once the setting is successful, this icon appears.
Only one click is required.
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Enter the adjustment weight (e.g. "150.0") and set the characteristic value range.
Set parameters “Min/Max weighing range” and the “resolution unit” in register “Calibration parameter 2”.
"Resolution range 1": Resolution of range 1. It is the minimum change of the displayed weight. The unit is the same as the “Weight unit” selected under the "Calibration param. 3" tab. Example:
"Resolution range 1" is set to 0.05 kg, so the minimum change is 0.05 kg.
"Resolution range 1" is set to 1.0 kg, so the minimum change is 1 kg. Note that resolution is related to weight display and is different from precision.
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Set parameters “weight unit” in register “Calibration parameter 3” and then click Send..
Ensure that the scale is empty (not loaded) and click Adjustment zero valid (3).
After that, the displayed value is as follows:
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Add a weight of 150 kg (the display may contain some error), and then click Adjustment weight 1 valid (4).
The weight becomes the set weight, and the adjustment is complete.
If the corresponding weight is now changed, it will be equal to the actual weight, and exact accuracy will be achieved.
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Eventually you may save the calibration data’s into a file Receive all data’s from the SIWAREX FTA to the PC
During the transmission from the Siwarex FTA module to the PC, the following message-window appears:
Save the data as a Siwatool FTA File:
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The following shows how to upgrade the firmware version of SIWATOOL FTA.
Select the desired firmware version file in the corresponding folder, and then click Start transfer.
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2. Calibration with STEP 7 Programming
For the program, see "Getting started" in the SIWAREX FTA package. The following example is based on the sample program, which is available at www.siemens.com/weighing. For detailed programming, see SIWAREX FTA Operating Guide. Example: The hardware configuration is as shown below. Note that CPU317-2DP is used here.
Kommentar [KS1]: Der erste Satz ist missverständlich. Wäre es vlt. Besser ihn ans Ende zu packen: „If you have purchased the „Getting Started“ package, the sample program is available on your “Getting Started” CD.
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Access DB12 to add the corresponding parameters and other valid parameters to the variable table for later inquiry. (A data block must be defined for each scale, which must contain the parameters of SIWAREX FTA and their actual values. Select the data block No. as required. In the software package used in this example, DB1 is already defined as a scale data block.) In this example, the process values of DB12.DBD 22 and the adjustment weight of DB12.DBD 90 are used to facilitate the corresponding operations.
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Some commands are listed below, see more in chapter 6 of the manual:
Type command code “1” into DB12.DBW40 to set the service mode to ON. and type triggering instruction “true” into DB12.DBX40.0.
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It is advised to accept the default values of other parameters for this first use command “203” to read the calibration datas value in DR3. The command list is shown below:
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Then change the calibration weight in DB12.DBD90 Then use command “403” to transfer the new weight value from the memory of CPU to the memory of SIWAREX FTA (DR3). Assume that the calibration weight on the scale will be 120.0 kg.
Command code “203" Triggering instruction “true”
Current range
Accept command code
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Writing is successful. Ensure that the scale has no load, and use command “3” (Adjustment zero valid) and type triggering instruction “true” into DB12.DBX40.0 to calibrate the scale, the process value of DB12.DBD22 changes to 0.0. Add a weight of 120.0 kg, and then use command “4” (Adjustment weight 1 valid) in the same manner. Finally, use command “2” to set service mode to OFF. After range calibration is complete, you can view the real-time process weight value through DB12.DBD22. For other operations, see the sample program or the operating guide. If you have any problems or suggestions regarding the related products or documents,
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