Siemens 6ES5252-3AA13 is an IP252 control module for the SIMATIC S5 automation platform (6ES5-252-3AA13). In catalogs it is described as the IP252 CTRL MOD designed to be used inside S5 systems to interface with the IP252 bus for control tasks. The part number 6ES5252-3AA13 is widely listed by Siemens and third‑party vendors as the IP252 module for S5, and is commonly encountered in retrofits, repairs, or upgrades of legacy Siemens automation installations.
