Hi Everyone,

We are upgrading our existing S7-300 system, which includes the CPU 315-2DP (Main & Redundant) and ET200M as IM.

Our supplier has recommended the S7-1500R/H with CPU 1513R-1PN and ET200SP for an S2 configuration.

I have added the devices and modules according to the BOM and established the ring connection by referring to the manuals available in the forum. However, even after completing the ring structure in MRP, the CPU displays a warning indicating an "Unused port of the Redundant CPU" (see attachments).

I have shared my selection project in the attachment.

Could you provide a solution to resolve this issue?

Best regards,