Modbus TCP IP interface to SEL-735 Power Quality and Revenue Meter

Hi all, sorry for bothering you.

We have a Pi modbus TCP interface to an SEL-735 power quality and revenue meter. The interface is successfully pulling data from the meter's 16-bit registers into the PI archive.

Now we are trying to access data stored in the meter's 32-bit holding registers. SEL refer to to the data type as "Long 100". SEL say the data type "is defined as a 32-bit signed integer quantity that occupies two sequential 16-bit register addresses and has a scaling factor of 100 preapplied". The interface is returning a constant and incorrect integer value (it should be changing and much larger). The settings we have tried for "location 3" are 704 and then 703, with no success. The Pi point type is Int32.

The other 16-bit data from the meter continues to flow in ok.

If anyone has experience with Pi to SEL-735 modbus interface and/or the Long 100 data type, would be interested in your comments.

Thank you.

Parents Reply Children
No Data