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Modbus sensor reading error with double word register

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Sensor: Modbus Custom Sensor. Error: When the register has a "double word" format the reading is erroneous under certain conditions. Description: When the value of the variable is high enough so that the two words have a non-zero value, the value contained in the PLC is read correctly by the PRTG sensor. But if the joint value of the two words is low, with the higher weight word being "zero", the same thing contained in the PLC register is no longer read.

Is there any correction or sensor configuration I should consider?

Thanks

modbus reading-error register

Created on May 8, 2023 1:43:44 PM



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We would need some more information, ple

To see what the sensor sees. Please open a support ticket to [email protected] and send us screenshots of the sensor overview tab, settings tab and log tab. Then activate the "Store Result" option in the sensor settings, wait for a couple of scaning intervals so the debug creates the result files, and forward us the log files (Named result of Sensor XXX.Data.txt and Result of Sensor XXX.txt) located on the corresponding probe. If you hover over the information icon next to 'Result Handling' you can see a detail of the location where this file is created.

PRTG will store the files in \Logs\sensors subfolder of the PRTG data directory on the probe system. To make sure what is the folder you are using for the PRTG data, open the 'PRTG Administration tool' program in the core/probe and go to the Core server tab, there you can see the location. Send us those logs too.

Created on May 11, 2023 5:03:41 AM by Jonathan Mena [Paessler Technical Support]




Disclaimer: The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.