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

• Compact construction;
  9‑pin Sub‑D socket for connection to PROFIBUS
• 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. No slot rules apply in this case.
• User-friendly wiring;
  the Sub-D socket is easily accessible and simple to operate.
• The CP 443-5 Basic can be operated without a fan. A backup battery or memory module is not required
• When using SEND/RECEIVE, the number of operable modules depends on the S7-400 CPU used.