These products have been matured and replaced by 2572-B or 2500P-ECC1 which should be used on all new installations. 

The 2572-A Ethernet TCP/IP Adapter is the next generation 2572 network interface module for 2500 Series® or Simatic® 505 controllers. The 2572-A provides connectivity to Ethernet networks using IEEE 802.3, Ethernet II and Transmission Control/Internet Protocol standards, at 10M or 100M speeds. IMPORTANT NOTE: 2572-A HAS BEEN MATURED.  IT IS REPLACED BY 2572-B or 2500P-ECC1, WHICH SHOULD BE USED ON ALL NEW DESIGNS.

The 2572-AF Ethernet TCP/IP Adapter with Optical Fiber Connection is the next generation 2572 network interface module for 2500 Series® controllers. The 2572-A provides connectivity to Ethernet networks using IEEE 802.3, Ethernet II and Transmission Control/Internet Protocol standards, at 10M or 100M speeds.  IMPORTANT NOTE: 2572-AF HAS BEEN MATURED.  IT IS REPLACED BY 2572-B or 2500P-ECC1, WHICH SHOULD BE USED ON ALL NEW DESIGNS.

The 2572 Ethernet TCP/IP Adapter is a network interface module for 2500 Series® or Simatic® 505 controllers. The 2572 provides connectivity to Ethernet networks using IEEE 802.3, Ethernet II and Transmission Control/Internet Protocol (TCP/IP) standards. IMPORTANT NOTE: 2572 HAS BEEN MATURED.  IT IS REPLACED BY 2572-B or 2500P-ECC1, WHICH SHOULD BE USED ON ALL NEW DESIGNS.