Calibrating the Analog Measurement System
(Original Document)
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Introduction
Calibration can be carried out on a Control Expert station connected to the PLC using the calibration screen.
It can also be done using an operator dialog, which uses Control Expert language instructions.
NOTE: The procedure can be stopped at any time by pressing Cancel. The module reverts to the previous parameters. The current calibration parameters are therefore lost.
The procedure is only enabled if the module has been calibrated correctly.
If there is measurement saturation, the new parameters cannot be saved. Either correct the detected error or cancel the procedure, using Cancel.
Procedure
This table describes the procedure for calibrating the analog measurement system.
Step
Action
Result
1
Switch the rack on.
The product is initialized, carries out self-tests and receives its configuration.
2
Access the calibration screen while the processor is in RUN mode and the terminal is in online mode::
  1. Select Configuration in the project browser.
  2. Click the module's slot.
  3. Select the Calibration tab.
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3
Check that the counter output is empty.
-
4
Click the Zero Load button to carry out zero load calibration (recognized by the load receiver).
This phase requires around 20 seconds.
An hour glass appears until the operation is complete.
The module reports an error condition and any measurement is invalid.
The status of the flag %Iwr.m.0.4.6 Calibration_in_progress changes. The module indicates the acquisition of the zero weight reference and processes the reports.
5
Place calibration weight.
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6
Enter the calibration weight value in the "Standard Load" field (the value of the maximum weight), and click the Standard Load button.
If the command is disabled, an error message appears.
This phase requires around 20 seconds.
The module checks the standard load weight against the maximum weight.
The status of the flag %Iwr.m.0.4.6 Calibration_in_progress changes.
The module acquires the standard load weight reference, processes and positions the report.
7
Click the Save button to recognize the parameters resulting from calibration.
The module and the processor recognize and save the parameters resulting from calibration.
During the write phase, the measurement keeps reporting a channel error until the writing is complete. Measurement restarts when writing is finished. The measurement is valid.
NOTE: If you skip steps 5 and 6 in this table, a default gain is applied.