The CP 443-5 Extended communications processor features all the advantages of the SIMATIC S7-400 design:

• Compact construction;
  9‑pin Sub‑D socket for connection to PROFIBUS DP
• Single-width module
• Easy installation;
  the CP 443-5 is mounted on the S7-400 rack and connected to the other modules of the S7-400 by means of the backplane bus.
• User-friendly wiring;
  the Sub-D socket is easily accessible and simple to operate.
• The CP 443-5 Extended can be operated without a fan.
  A backup battery or memory module is not required
• A maximum of 14 CPs can be operated.

If the CP 443-5 Extended is used as a DP Master, at least four and as many as 10 additional PROFIBUS DP lines can be set up in the central rack. The number of possible PROFIBUS DP lines depends on the SIMATIC S7-400 CPU that is used.

When using S7-communication, no slot allocation rules apply. The number of operable S7 connections depends on the S7-400 CPU.

When using SEND/RECEIVE, the number of operable modules also depends on the S7-400 CPU.