Siemens 6ES5103-8MA02 Programmable Logic Controller Module

Siemens 6ES5103-8MA02 CPU 103 for the SIMATIC S5-100U series combines central processing with an integrated 24 V DC input power supply and dual regulator rails, delivering the control brain and on-board power from a single module. It provides 10,240 RAM statements, 128 counters, and 128 timers, and supports up to 256 digital inputs/outputs and up to 32 analog I/O channels, enabling broad legacy automation tasks on S5-100U systems. The module includes regulated outputs of +9 V (V1) and +5.2 V (V2) for logic and peripheral circuitry, while the enclosure measures 91.5 x 135 x 120 mm and weighs about 650 g, making it a compact fit for retrofits in constrained panels. Widely used in older production lines, packaging machines, conveyors, and machine tools, the CPU 103 is commonly deployed in retrofit projects where existing wiring and the established program structure of the S5-100U can be retained with minimal rewiring.