What it is and where it sits
The Siemens 6GK7443-1EX31-0XE0 is a CP 443-1 communications processor with two 100 Mbps RJ45 ports and an integrated Ethernet switch. It runs as a PROFINET IO controller supporting S7 communication, open communication (SEND/RECEIVE), S7 routing, ISO, TCP, and UDP stacks.
Integration and commissioning notes
Mounts in a standard slot with two forward-facing RJ45 ports. IP configuration via DHCP or configuration block; fast startup and PROFIenergy support enabled in STEP 7, and extended web diagnostics accessible over the same port.
What you need for the BOM
Order code 6GK7443-1EX31-0XE0 with group code R322, product group 2414, single-piece packaging, dimensions 0.23 x 0.035 x 0.3 m. No pin-compatible direct alternative listed within the same family.