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en:sw:01-mervis:analog-outputs-hidden [2023/11/22 10:12] avsetula [Measuring resistance (temperature)] |
en:sw:01-mervis:analog-outputs-hidden [2024/04/15 13:55] (current) avsetula [Measuring resistance (temperature)] |
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| The analog output on Group 1 of Neuron and Axon (AO_1.1) is able to measure resistance as well /* FIXME (check the documentation na mereni odporu do Automation 101 -> How to's) */. To set the AO_1.1 to the Resistance measurement mode, follow the configuration steps above. | The analog output on Group 1 of Neuron and Axon (AO_1.1) is able to measure resistance as well /* FIXME (check the documentation na mereni odporu do Automation 101 -> How to's) */. To set the AO_1.1 to the Resistance measurement mode, follow the configuration steps above. | ||
| - | The resistance measurement is mostly used for measuring resistive thermometers such are Pt100, Pt1000, Ni1000,... Those sensors have known temperature vs. resistance curve and Mervis can directly transform the measured values into degrees of Celsius. This transformation is done on the property of the "write" variable, as with all the previous changes. Look for the property "Transform" in the **Properties panel**. The default value is "identity", which means the variable will always contain the measured resistance in Ohms. You can change the transformation to "**ResistanceToTemperature**" and box with other options will appear underneath. All you need to do is to change the "Kind" to the type of the resistive thermometer you are trying to read from. You can leave all the other parameters as is. And as with all the changes to the configuration of the PLC, [[en:sw:01-mervis:unipi-configure-module-hidden|apply it]] as we did above. | + | The resistance measurement is mostly used for measuring resistive thermometers such are Pt100, Pt1000, Ni1000,... Those sensors have known temperature vs. resistance curve and Mervis can directly transform the measured values into degrees of Celsius. This transformation is done on the property of the "read" variable, as with all the previous changes. Look for the property "Transform" in the **Properties panel**. The default value is "identity", which means the variable will always contain the measured resistance in Ohms. You can change the transformation to "**ResistanceToTemperature**" and box with other options will appear underneath. All you need to do is to change the "Kind" to the type of the resistive thermometer you are trying to read from. You can leave all the other parameters as is. And as with all the changes to the configuration of the PLC, [[en:sw:01-mervis:unipi-configure-module-hidden|apply it]] as we did above. |
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| - | {{ :en:sw:01-mervis:analog-outputs-05-tranform-kind.png?direct |}} | + | {{ :en:sw:01-mervis:analog-outputs-read-resistivity_transform.png?direct |}} |
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