Hello, I've got a rotation sensor that is returning values via Modbus through a Mitsubishi PLC, and the PLC programming software is calculating and displaying decimal values for a rate in the range 0.2m3/hr to 3 decimal places and stored as FLOAT [Single Precision]. However, when the numbers get to …

[Paneltech memory] The strange thing is, we always get the same garbage per sensible number; I have observed them to match up (any errors would be down to human reaction times copying the log). I cross-referenced the values, and direct from the Modbus Flex Getter or after "Get 32bit float" val…

Sorry, it is unclear what you are saying. Is there a problem or not? PS, tables are supported in markdown, making it much easier to read e.g... GXWorks | Node-red | Expected Value / Type | Info ------- | -------- | --------------------- | ---- 49504 | 49504 | 0.241 | buffer parser type set to UI…

I have reformatted the data. Issue is node-red seems to be reading single precision floats as garbage (albeit consistent sequential garbage), whereas all other modbus output numbers are read as exported from the PLC without any problems or buffer parsing. I was just wondering if there was a known nu…

As explained before, the reason they will be garbage will be because of how you address the values. [image] Steve-Mcl: Typically though, what happens with PLC values is you or reading across the bounds of two different values or the data is byteswapped (little vs big endian). So if you can p…

That makes sense; apologies for misunderstanding. I will post it here: gfuel_flow_rate Double numbers given for some numbers as I have observed both to appear in node-red while the PLC monitoring software GXW3 reports only one value. The numbers are definitely not random/read from the wrong place, …

I found this thread: Modbus 16 bit registers to Float value that sounds quite like my issue, but haven't had much luck copying the measures from that thread. I'm currently experimenting with reading the hex buffer from the Modbus node.

If you dont provide REAL SAMPLE data I cannot assist you. [image] Steve-Mcl: I will need a capture of data coming out of the modbus node (use Copy Value button) [image] Steve-Mcl: How to copy value [chrome_MD52DtN5Eo]

I must apologise if I have misunderstood, the sample data is real, directly from running systems. Not simulated. Do you mean like this? screen recording GIF on Imgur Or are you asking for the HEX output of the Modbus buffer? What I have done so far is this: screen recording GIF on Imgur (Imgur s…

In order to develop a solution for you, I need actual data captured using the copy value button and for it to be posted into a reply as text (JSON) (not a screenshot). The reason for this is I will simulate your device (something I do not have access to) by taking the ACTUAL data that you post and…

The screenshots were not data, only illustrative of my data acquisition process(es), as I'm not sure if we're talking about getting it from the same place. My Modbus-flex-getter node is outputting numbers like I previously posted (though if I remember rightly the previous data went through buffer p…

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Modbus UINT16 to decimal?

General

Darren 17 August 2023 11:51 11

This thread is also similar to my issue: How to Decode 16 Bit signed Integer

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Modbus UINT16 to decimal?

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