Modbus device always disconnected

Ignition
,
1

Hello,
I have connected 43 modbus devices to a Ignition server. 25 are Analog-Digital converters and the other 18 are energy meters (Siemens PAC 3200 and Siemens PAC 2200)
All Energy meters are in the same network segment and are connected and can be accessed (firewall OK, Pingable, telnet works).

I have issue with 3 of them. Ignition does not connect to them and always states them as Disconnected and never tries to reconnect.

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I have already tried to disenable/ enable them -> Immediately state Disconnected.
Restart Server/ Service -> Immediately state Disconnected.
Disabled all tags in Ignition Designer -> No change

The strange thing is that I can connect these 3 devices with another software (OpenMod Scan) on the same server and they work well and i can read data. Thus i think it must be an Ignition issue
We use Ignition 8.1.35

I also tried to connect the devices to another ignition server with 8.3.2 getting the same result as with 8.1.35.

CPU/Memory load is also very low:

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Diagnostics/Logs does not show anything related to these devices.

What can be the problem?

Thanks in Advance for your help.

2

I've got the same with a few meters as well. They were connected for an hour or so, then reverted to the permanent disconnect. Same behavior you are describing. But I haven't chased them much yet, as the client has a bunch of other network issues that we're working thru. Figured I'd get a known good network before I tried to figure the 3 of 300 out... Interested to hear if you figure it out first..

3

Hello everyone,
In my case there where hidden characters in the IP address of the device, probably from copy/pasting. I retyped the IP address manually and if fixed the problem.

Ignition support supported me finding the issue. - Thank you very much!

You can use Ignition extended logging options or Wireshark to see the problem.

BR Gerald

4

Thanks for posting the solution. I'll have to give that a try.