Siemens 6ES5103-8MA02 SIMATIC S7 Analog Input Module

Siemens 6ES5103-8MA02 is a SIMATIC S5 CPU103 module designed for the S5-100U PLC family, serving as the central processing unit for legacy Siemens control systems and handling program execution and I/O coordination in older installations. The CPU103 model is commonly referenced as the 6ES5103-8MA02 part number and appears in supplier catalogs and refurbish listings as the core processing unit for S5-100U configurations. It supports Windows-based HMI connectivity via the AS511 protocol over the programming port RS422-TTY and can communicate over Profibus DP when used with an optional CP 543-1 interface, enabling integration with older field devices and networks. This module is appropriate for retrofitting, maintenance, or replacement of aging S5-100U systems where authentic Siemens CPU103 hardware is required.