The CP 1543SP-1 communications processor connects the ET 200SP Distributed Controller with Industrial Ethernet networks. By combining a variety of security features such as an SPI (Stateful Packet Inspection) firewall, VPN and data encryption protocols (e.g. SNMPv3), the communications processor protects individual ET 200SP Distributed Controllers or even entire automation cells against unauthorized access.

The module can also be used for integrating the ET 200SP Distributed Controller into an IPv6-based network. All functions can be configured with STEP 7 Professional, V14 (TIA Portal) and higher.

The CP 1543SP-1 supports the following communication services:

• PG/OP communication
• S7 communication
• Open communication (Open User Communication)
• IT communication
  • Sending emails via SMTP or ESMTP with "SMTP-Auth" for authentication on an email server (also with IPv6)
• Security functions
  • Stateful Packet Inspection (layer 3 and 4 firewall)
  • Secure communication via VPN (IPsec)
  • Secure access to the web server of the CPU via the HTTPS protocol
  • Secure transfer of the time of day (NTP)
  • SNMPv3 for tap-proof transfer of network analysis information
• Integration of the ET 200SP Distributed Controller into IPv6-based networks