Siemens SIWAREX MS User manual

©Siemens AG 1

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

©Siemens AG 2

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

©Siemens AG 3

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

©Siemens AG 4

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)

©Siemens AG 5

SIWAREX_MS_Quick Guide_V4.0.doc, 12/2010

System Configuration

©Siemens AG 6

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 -

©Siemens AG 7

SIWAREX_MS_Quick Guide_V4.0.doc, 12/2010

Connecting the PC for SIWATOOL MS:

©Siemens AG 8

SIWAREX_MS_Quick Guide_V4.0.doc, 12/2010

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:

©Siemens AG 9

SIWAREX_MS_Quick Guide_V4.0.doc, 12/2010

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”.

©Siemens AG 10

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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

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