IEC60870-103 Unable to read analog measures

IEC60870-103 Unable to read analog measures

Hi,
i have a big problem.
I want to read three analog measures from a protection using iec870-103 protocol via serial communication.
Zenon has a IEC870-103 driver correctly configured: it can read variables states from protection.
My problem come when i want to read Voltage, Current and Power measures.
I configured variables as follows:

Current: FUN: 160 INF: 144 INDEX: 0
Voltage: FUN: 160 INF: 145 INDEX: 1
Power: FUN: 160 INF: 146 INDEX: 2
I inserted in a page three Zenon Numeric Values object to display values of the variables. I see 0 value in each analog variables. Using an analog reaction matrix I understood that BL_870 bit is active for the three analog variables.
You can say me there is a reading-block in the protection (BL_870 bit) but using a simulator, problem doesn't appear.
Using a master simulator of IEC870-103 protocol, three analog values are correctly red.
Which is my mistake?
Why simulator works and Zenon doesn't work?
It depends on time sinc?
Help me please.
Steven Costantini.

This is a migrated post! Originally posted on 16.06.2016 by user steven.costantini. Please be aware that information can be outdated.