Calibrating the Analog Measurement System by Program
(Original Document)
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Introduction
Several language elements are used to implement and supervise the calibration mechanism.
The calibration screen facilitates the procedure, but it can also be performed by program using reserved data.
Procedure
Program the following operations to perform a calibration.
Step
Action
Result
1
Zero weight
Enter WRITE_CMD while setting the calibration order of the channel using the zero weight (%MWr.m.0.3.1=1).
The status of the %IWr.m.0.4.6 Calibration in progress indicator changes.
This operation enables you to determine the Offset parameter.
2
Standard Load
Load the standard load weight value in the following words (high resolution format):
  • Premium/Atrium: %MDr.m.0.4
  • M580: %MWr.m.0.4 & %MWr.m.0.5
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3
Enter WRITE_CMD while setting the calibration order of the channel using the standard load weight (%MWr.m.0.3.2=1, or %MWr.m.0.3.12=1 for a graded calibration).
The %IWr.m.0.4.6 Calibration in progress indicator changes status.
This operation is used to determine the Gain parameter.
4
Save the parameters in the module.
Enter WRITE_CMD while setting the save order of the calibration in the module (%MWr.m.0.3.0=1).
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5
Copy the module parameters in the CPU.
Enter WRITE_CMD while setting the save order of the calibration in the processor (%MWr.m.0.3.11=1).
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Summary of the Data Used
The following table describes the data involved in a calibration.
Type
Role
Associated Data
Command type
Save calibration in the module
%MWr.m.0.3.0
Zero weight
%MWr.m.0.3.1
Standard load weight (Normal)
%MWr.m.0.3.2
Forced calibration (CPU -> Module)
%MWr.m.0.3.10
Save calibration in the processor
%MWr.m.0.3.11
Standard load weight (Graded)
%MWr.m.0.3.12
Command parameter
Value of standard load weight
Premium/Atrium: %MDr.m.0.4
M580: %MWr.m.0.4 & %MWr.m.0.5
Report
Calibration in progress (Normal)
%IWr.m.0.4.6
Instability
%IWr.m.0.4.9
Overload or underload during calibration
%%MWr.m.0.2.0
Non-calibrated module
%MWr.m.0.2.9
Calibration mode
%MWr.m.0.2.14
Forced calibration mode
%MWr.m.0.2.15