PNPN Coupler Multiple IO Controllers on one interface

Hello Everyone,

I'm getting into problems configuring a PN PN Coupler 6ES7 158-3AD10-0XA0 firmware V4.2.

Having 4 IO Controllers connected to PNPN this way:

STS5000 Head     <-->

STS5000 Tail        <-->    [X1 | PNPN Coupler | X2]    <---> PLC_1 CUSTOMER

LMS700                <-->

We would like to get:

- 4 slots of data to be read by all (shared MSI I think) the 3 controllers on X1

- 3 slots (one for each controller on X1) to be written exclusively

I configured the controllers as in the attached pictures. The controller STS5000 Tail is actually not taking part in the configuration, it will be configured later, it is not affecting the PNPN configuration.

The behaviour I get is this:

- when I download the LMS700 hardware config the pnpn online diagnostic says: "Net configuration error - Difference between nets at slot 5" and the communication works for STS5000 Head

- when I download the STS5000 HEAD hardware config the pnpn online diagnostic says: "Net configuration error - Difference between nets at slot 6" and the communication works partially for LMS700. Partially because only write works.

I also tried to configure PNPN on one project and export GSD into the other, but no luck.

Which mistake am I making?

Thank you in advance,

Davide