In a SIMATIC PCS 7 automation system, PROFIBUS DP lines can be connected to distributed process I/O both via a PROFIBUS DP interface in the CPU and via a CP 443-5 Extended communication module.

If a module slot provided in the CPU for the PROFIBUS connection is still empty, an IF 964-DP interface module is required in addition.

With the AS 410 modular automation systems, an additional layer is applied to the PCB of CPU 410‑5H Process Automation (conformal coating). A CP 443‑5 Extended in the conformal coating version is therefore also preferred for the AS 410 (component of the AS bundle configuration).

For information on the type and number of configurable PROFIBUS DP interfaces, see chapter "Automation systems".