I've moved this to the ideas section.  please follow the link and vote on it.https://community.ptc.com/t5/Creo-View-Illustrate-Schematics/add-total-connection-count-parameter-to-block-level-to-add-up/idi-p/955775

You should be having an email conversation soon with PTC folks to learn more about the specifics of your customer's situation and understanding why they would want to change systems.

Adding link to Kepware document in regard to connecting to a FX1N PLC:   Article - CS333162 - Communicating to Mitsubishi FX1N PLCs in PTC Kepware products