Here is the quick comparison for those 2 connectors:
S7 Connector supports S7 300/400 and S7 1200/1500 PLCs. Supports upto 6000 tags/sec publishing rate and free
S7+ Connector supports only S7 1200/1500 PLCs. Based on Connectivity suite architecture and supports upto 40000 tags/sec publishing rate. Light-weight, resource efficient and costs 168€/annum
Hi András,
All the relevant information can be found in the documentation of both of the applications:
s7 : https://support.industry.siemens.com/cs/document/109813186/simatic-s7-connector?dti=0&dl=en&lc=de-DE
S7+: https://support.industry.siemens.com/cs/document/109808327/simatic-s7-connector-for-industrial-edge?dti=0&lc=en-US
As for the pricing, you can find more information for the cost of all items related to Industrial Edge:
https://www.dex.siemens.com/edge/manufacturing-process-industries?cclcl=de_DE