No way to read a undefined floating point value through KEPServerEX?

Question

When using drivers with HMI applications like InTouch or Ignition, the tag in its database could have address modifiers or simply the tag type to let the Modbus driver know that you're looking for a floating point that is using more than one register.

It appears that there's no way to accomplish the same thing when using KEPServerEX. Instead of a Modbus driver specifically written for Intouch or Ignition HMI applications.

The only option is to manually create tags inside of KEPServerEX and then read those from the HMI?

Tanquen · Accepted Answer

I was using slave and poll tools from: https://www.modbustools.com/
This added to the confusion and complexity because I could only run it for 10 minutes. I'm sure there's a setting in the tool but I figured the default would work, but to read the value correctly I did need to change the data encoding `First Word Low` option to be disabled.

There was also an issue with getting the simulator and KEPServerEX and Ignition all talking within the 10 minute window. The other day I wasn't seeing any value using `@float` but this morning I believed I was doing the same exact thing and then all the sudden I could see a value but it was still a little off.
124 vs 125.25
`First Word Low` Option fixed that but I don't know way it was `0` all day yesterday.

rajskumar · Answer

Hello,

Are you looking to define tags directly in the client instead of creating them in KEPServerEX?

If yes, you can use dynamic tag addressing to retrieve data in the client without defining tags in the Kepware server. Here is an article that clarifies the difference between static and dynamic tags.

CS278481 - Differences between static and dynamic Tags in KEPServerEX / ThingWorx Kepware Server

Thanks

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