6GK1543-1AA01 SIEMENS SIMATIC PLC

The Siemens 6GK1543-1AA01 is a SINEC CP5431 FMS/DP communication processor designed for the SIMATIC S5 PLC platform. It connects legacy S5 controllers—specifically the S5-115U/H, S5-135U, and S5-155U/H—to PROFIBUS networks, enabling data exchange with distributed I/O, drives, and higher-level automation systems. This module is the FMS/DP variant of the CP5431 series. It is important to distinguish it from the CP5430 TF (6GK1543-0AA02), which is a different card with Technology Function capability. The 6GK1543-1AA01 is the designated replacement for the discontinued CP5430 TF, but the two are not functionally identical—verify your application requirements before substituting.