Siemens SIWAREX MS User manual

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SIWAREX_MS_Quick Guide_V4.0.doc, 12/2010
SIWAREX MS
Weighing Module for Level Measurement, Weighbridges etc.
Calibrating SIWAREX MS with SIWATOOL MS
Quick Guide
For modules with order number 7MH4930-0AA01
Contents
1. Hardware Requirements...............................................................................................3
2. Siwarex MS connections ..............................................................................................6
3. Establish the communication to the Siwarex MS module .............................................8
4. Adjustment with an adjustment weight..........................................................................9
4.1 Set the SIWATOOL parameters........................................................................9
4.2 Adjustment procedure.....................................................................................12
5. Adjustment without an adjustment weight (theoretical adjustment)............................14
6. Create a Siwatool backup file .....................................................................................18

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SIWAREX_MS_Quick Guide_V4.0.doc, 12/2010
Introduction
SIWAREX MS is a compact weighing module for SIMATIC Automation System S7-200.
Main applications are bin scales, weighbridges, crane scales, force and tightening torque
measuring.
Purpose of this document for functional safety
This programming manual contains all information that you will require to commission and
use the device.
It is aimed at persons who install the device mechanically, connect it electrically,
parameterize and commission it, as well as at service and maintenance engineers.
Notes on warranty
The contents of this programming manual shall not become part of or modify any prior or
existing agreement, commitment or legal relationship. All obligations on the part of
Siemens AG are contained in the respective sales contract, which also contains the
complete and solely applicable warranty conditions. Any statements on the device
versions described in the programming manual do not create new warranties or modify the
existing warranty.
The content reflects the technical status at the time of printing. We reserve the right to
make technical changes in the course of further development.
Validation of this document
This documentation is only valid in conjunction with the manual SIWAREX MS. This
manual is available on the Siemens homepage.
http://support.automation.siemens.com/WW/view/en/22600601

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SIWAREX_MS_Quick Guide_V4.0.doc, 12/2010
1. Hardware Requirements
Following hardware parts and software are requested to integrate a scale into SIMATIC
S7-200: SIWAREX MS module, 24V Power Module, S7-200 CPU, SIWATOOL MS
configuration package, 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.
24V Power Supply SIMATIC CPU S7-200 SIWAREX MS
7MH4930-0AA01
SIWATOOL RS232 Cable
7MH4607-8CA

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SIWAREX_MS_Quick Guide_V4.0.doc, 12/2010
Configuration Package for SIWAREX MS:
7MH4930-0AK01
Adjustment weight Scale
( >5% of the sum of the nominal value
of all load cells)

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SIWAREX_MS_Quick Guide_V4.0.doc, 12/2010
System Configuration

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SIWAREX_MS_Quick Guide_V4.0.doc, 12/2010
2. Siwarex MS connections
Load Cell Connection:
Connection and signal
designations
Comment
SEN+ Sense line +
SEN- Sense line –
SIG+ Measurement line +
SIG- Measurement line –
EXC+ Load cell supply +
EXC- Load cell supply -

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Connecting the PC for SIWATOOL MS:

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3. Establish the communication to the
Siwarex MS module
Start the Siwatool MS software into Windows:
For establishing the communication between the Siwarex MS module and the Siwatool
software, click the button Online:

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4. Adjustment with an adjustment weight
4.1 Set the SIWATOOL parameters
When the communication is established check the following parameter-settings:
Adj.weight 1:
Enter the value of the adjustment weight.
The adjustment weight is an integer-value (up to 32767).
For example:
a) For a 20 kg scale you may use a resolution of 1 g:
- the parameter “Adj. weight 1” is set into gram (e.g. “20000”).
- the parameter “Numeral step” (index card “Scales parameter”) is set to “1”.
- the parameter “Decimal point” (index card “Scales parameter”) is set to “0”.
- the parameter “Weight unit” (index card “Scales parameter”) is set to “gr”.
b) For a 40 kg scale you may use a resolution of 10 g:
- the parameter “Adj. weight 1” is set into gram x10 (e.g. “4000”).
- the parameter “Numeral step” (index card “Scales parameter”) is set to “1”.
- the parameter “Decimal point” (index card “Scales parameter”) is set to “2”.
- the parameter “Weight unit” (index card “Scales parameter”) is set to “kg”.

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The decimal point is not part of the integer-value and is only used for the Siwatool-display
(and a remote display, if available).
That means the numeral step and the decimal point have to determine, so that the
displayed weight value (weight value = integer-value) will not increase the value of
32767.
Characteristic Value:
Characteristic value of the load cell.
The specification of the characteristic value can be read into the techincal data sheet of
the load cell.
Limit frequence:
If this parameter is set to 5 Hz, the scale will respond quickly to a weight change; if it is set
to 0.05 Hz, the scale will “move slowly”.
Step response of the limit frequence of 2 Hz:
Depth of average value filter:
The average value filter ensures a stable weight value and prevents interference.
The weight is measured according to the average value of n weight values.
If n = 10, 10 weight values will be used for calculating the average value. The earliest
value is discarded every 20 milliseconds and the latest value will be added for the
calculation.
Critical dam
p
in
g