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TOPIC: ChanAi do not refresh ActualValue

ChanAi do not refresh ActualValue 5 years 11 months ago #9680

  • ceccon
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Hello Guys

I am facing a problem where ActualValue from a ChanAi do not refresh. I attach a picture where I have one ChanAi working properly and other is not, I did double check on ChanAi attributes and also AI atTributes. both looks to be right configured.

Just one extra information all ChanAi works pretty fine for almost 3 months this one stop and I could not find the reason, may be someone know the solution?

Thank
BR
/Ceccon
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Last Edit: 5 years 11 months ago by ceccon. Reason: adjust picture size
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ChanAi do not refresh ActualValue 5 years 11 months ago #9681

  • brunad
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Hi Ceccon,

The link between raw value range and actual value range is weird :dry:
If it is a modbus link for instance, it would be contained in a raw 16bits word (maximum values int: -32768-->+32767 or uint: 0-->65535)

/Bruno
Last Edit: 5 years 11 months ago by brunad.
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ChanAi do not refresh ActualValue 5 years 11 months ago #9682

  • ceccon
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Hello Bruno, thank you for you support

Yes it is a modbus link, and it is working with Int32 as Claes teach me to use, please observe these extra informations
  • The first nozzle component of modbus net stop to work, the link between raw value and actual value is broken as you observe, if I change the component order always the first one stop to work
  • All nozzle components are the same, and all of them are set as Int32 bit representation
  • Every think was working before with no program changes it stop for first nozzle

      Do you see any reason for that?

      Thanks
      Best Regards
      /Ceccon
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ChanAi do not refresh ActualValue 5 years 11 months ago #9683

  • brunad
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Ok you can transmit int32 bits long int by read/write and combining two modbus register (int) if your equipments can do that not mine, directly (Eurotherm), issue is not there.
As I see the first converted actual value doesn't seems to match with the raw value. I tried with a calc sheet:

Ceccon_1.png



File Attachment:

File Name: Ceccon_1.gnumeric.zip
File Size: 2 KB




You can make some other tests by enter other raw values

So, I guess issue is not here, maybe a division by zero somewere or hardware issue ?

/Bruno
Last Edit: 5 years 11 months ago by brunad.
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