TBX AES 400 Module Calibration
(Original Document)
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Introduction
Calibration is performed globally for the module on channel 0.
You are advised to calibrate the module with no application loaded. Calibration can take place with the PLC task connected to the channel, in RUN or in STOP.
Calibration includes two stages:
Calibration of Zero
It is recommended to calibrate zero for the +/-20mV and +/-50mV ranges, and the thermocouple ranges. This involves calibrating zero for each of the channels simultaneously in the +/- 20 mV range at the required ambient temperature, by placing shunts directly on the input terminals of the base.
Full-Scale Calibration
Full-scale calibration is performed on channel 0, by placing the calibration source adjusted to full scale +/-0.01% directly on the input terminals of channel 0 of the base.
Precautions
In calibration mode, the measurement of all of the module’s channels are declared invalid, filtering and alignments are inhibited, and channel acquisition cycles may be lengthened.
With inputs other than channel 0 no longer acquired during calibration, the value sent to the application for the other channels is the last measured value before switching to calibration.
How to Calibrate the Module
The following table shows the procedure for calibrating the module:
Step
Action
1
Access the calibration adjustment screen
2
Double-click on channel 0.
Result: the question ‘Switch to recalibration mode?’ appears.
3
Answer Yes to the above question.
Result: the question ‘Perform 0 calibration?’ appears.
4
Place a shunt on all inputs of the module to perform 0 calibration, and answer Yes to the above question.
Otherwise, answer No not to perform 0 calibration.
5
You can then perform full scale calibration.
Depending on the range to calibrate, connect a reference voltage to the voltage input of channel 0:
  • Reference voltage = 10 V (precision +/- 0.01%) to calibrate the module for ranges 10 V and 0..10 V,
  • Reference voltage = 5 V (precision +/- 0.01%) to calibrate the module for ranges 0..5 V, 1..5V, 0..20 mA and 4..20 mA,
  • Reference voltage = 2 V (precision +/- 0.01%) to calibrate the module for ranges Pt1000 and Ni1000,
  • Reference voltage = 500 mV (precision +/- 0.01%) to calibrate the module for the 500 mV range,
  • Reference voltage = 200 mV (precision +/- 0.01%) to calibrate the module for ranges Pt100 and +/- 200 mV,
  • Reference voltage = 50 mV (precision +/- 0.01%) to calibrate the module for ranges +/- 200 mV and thermocouples E, J, K and N,
  • Reference voltage = 20 mV (precision +/- 0.01%) to calibrate the module for ranges +/- 200 mV and thermocouples B, R, S and T,
Warning: the reference 5 V is used to recalibrate the entire measurement string for ranges 0..20 mA and 4..20 mA, except for the 250 Ohm current shunt on the current input.
6
Once the reference is connected to the voltage input (for example 10 V), use the Reference drop-down list to select this value. You may have to wait while the connected reference voltage stabilizes, then confirm the selection by clicking the command button Confirm. The ranges connected to this reference voltage (for example 10 V and 0..10 V) are calibrated automatically.
7
You may have to calibrate the module for the other ranges.
The command button Return To Factory Parameters is used to cancel all calibrations previously performed and return to the initial factory calibration.
8
Press the command button Save to acknowledge and save the new calibration to the module. When you quit the calibration screen without saving, a message appears to inform you that the calibration operations will be lost