Siemens CP 443-5 Extended PROFIBUS DP communication processor (6GK7 443-5DX04-0XE0) is a DP master module designed to slot into an S7-400 rack to provide PROFIBUS DP connectivity. As a DP master, it supports Sync/Freeze and redundancy, direct data exchange, a constant bus cycle time, SEND/RECEIVE interfaces, S7 communication, and time-of-day functionality, enabling deterministic communication with PROFIBUS slaves. The device is described as S5-compatible and supports PG/OP and S7 communication, with firmware references listed for STEP 7 environments as V6.3 and V6.4, reflecting its long-standing role in Siemens automation setups.
