PA link, consisting here of IM 153-2 High Feature Outdoor and DP/PA coupler

To create a smooth network transition between PROFIBUS DP and PROFIBUS PA, the SIMATIC product range offers two versions: the DP/PA coupler and the PA link.

The following criteria can be applied when choosing the network transition:

• DP/PA coupler:
  For small quantity frameworks (volumes of data) and low timing requirements; data transfer rate on the PROFIBUS DP limited to 45.45 kbit/s
• PA link:
  For large number of stations and high cycle time requirements; data transfer rate on the PROFIBUS DP up to 12 Mbit/s