Modbus TCP connection to a Eurotherm nanodac

Ignition
1

Hello Everyone,

Has anyone had experience accessing a Nanodac parameter via Modbus TCP in Ignition?

I’ve added the device ,the statut of the device is connected, but when I attempt to read a parameter, I get a timeout error.

Here’s the error message I’m receiving:

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I followed the Modbus addressing recommendations from the Nanodac datasheet, as shown here:

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Let me know if you need more information,Thanks

2

  • Does the documentation indicate what unit number to use? Ignition defaults to unit #0, but many devices need something else. (Commonly, unit #1.)

  • That snippet of the documentation suggests that the device uses zero-based addressing. Check the advanced settings of your device in Ignition.

Perhaps you can share the complete doc? Or a link to it?

3

This is the link of the nanodac,

4
  • Does the documentation indicate what unit number to use? Ignition defaults to unit #0, but many devices need something else. Its not specified on the datasheet
  • That snippet of the documentation suggests that the device uses zero-based addressing. Check the advanced settings of your device in Ignition,i played tried to add and substitude 1 to check but same issue
5

Try using unit #1, and definitely use zero-based addressing. (Changing the latter would not get rid of the error caused by the wrong unit number.)

Try this OPC Item Path in a test tag:

[yourDevice]1.HR791

That should be AdvancedLoop.Main.MasterPV with one implied decimal place.

The floating point address for that is 0x8000 + 2 * 791 =>

[yourDevice]1.HRF34350
1 Like
6

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I tried it ,it seems to give the same result

7

Why did you name that tag "Connected" ?

But anyways, you need to:

  • Scour the user manual for examples that might show what unit # that device actually uses, and
  • Use wireshark or similar to see if any communication to that device is occurring--perhaps a firewall is interfering.
8

:rofl:,i used the opc browser to add the tag connected (the modbus device status),i just keep it and work with it.
Thanks ,i will check that and let you know

9

Hello,

Was there a resolution to the issue? I am having the same issue on a nanodac controller; no communication possible via Modbus.