MODNET Issue Double FLOAT - Power Monitoring Expert

[Bento.Israel]

Hi all,

I'm having trouble communicating with a DOUBLE FLOAT variable on a flow meter.

I can only communicate with the first two addresses of the 4: 30050 to 30053.

All other FLOAT variables work perfectly.

Any tips? I've tried several options. I tried PWRMODBUS, but without success.

Modbus Tester

Variable works but just 2 address 30050 and 30051

ADDRESS config at PME

G30050[array size] I've tried 2 and 4... both give me that same result

[olivier_vallee]

Hi @Bento.Israel,

The main issue is that you are trying to read a Double Float data type (64 bit), when the MODNET driver (and most other Plant SCADA drivers) only supports Float data type (32 bit).

There is an Engineering solution I can share with you. The credit goes to Eric Black who modified some VB6 code (see original thread here: https://softwareforums.aveva.com/heroes-hq/f/aveva-plant-scada/33631/reading-64-bit-double-4-registe...)

See attached conversion.ci (rename it from txt extension).

You call this function FUNCTION IntsToDouble(INT nInt1, INT nInt2, INT nInt3, INT nInt4) and pass in four INT tags.

Let me know how you go. Again, all credit to Eric Black. The code is provided as is with no warranty or promise to support.

Kind regards

Olivier