Siemens 6ES5103-8MA03 SIMATIC S5-100U CPU 103 PLC Module, 24 V DC, 10,240 Statements
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The Siemens 6ES5103-8MA03 is a SIMATIC S5-100U CPU 103 central processing unit designed for industrial programmable logic control systems. This CPU module features an integrated 24 V DC power supply, internal RAM capacity for 10,240 program statements, and support for digital and analog I/O expansion. It belongs to the SIMATIC S5-100U programmable controller family and supports STEP 5 programming, real-time clock functions, and industrial automation control applications.
| Manufacturer | Siemens |
| Order Number | 6ES5103-8MA03 |
| Product Family | SIMATIC S5-100U |
| CPU Type | CPU 103 |
| Processor | Byte/Bit Processor |
| Internal Memory | RAM, 10,240 Statements |
| Memory Submodule | EPROM / EEPROM |
| Nominal Supply Voltage | 24 V DC |
| Permissible Supply Voltage | 18–34 V DC |
| Digital I/O Capacity | Maximum 256 Inputs and Outputs Combined, Using Expansion Modules |
| Analog I/O Capacity | Maximum 32 Inputs and Outputs Combined, Using Expansion Modules |
| Timers | Approximately 128 |
| Counters | 128 |
| Binary Operation Time | Approximately 0.8 µs |
| Scan Monitoring Time | 500 ms, Selectable |
| Real-Time Clock | Integrated |
| Dimensions (W × H × D) | 91.5 × 135 × 120 mm |
| CPU Module Weight | Approximately 0.65 kg |
The Siemens SIMATIC S5-100U CPU 103 is used in programmable automation systems for machine control, process monitoring, digital and analog signal processing, and industrial equipment operation. The CPU supports STEP 5 programming, programmable timers and counters, interrupt processing, and communication within supported SIMATIC S5 configurations.
Apexon Supply provides B2B sourcing and replacement support for legacy Siemens SIMATIC S5 automation components. For existing S5-100U installations, verify the exact CPU order number, program and memory requirements, power supply configuration, and connected I/O modules before replacement. Existing application programs and required memory submodules should be considered during maintenance or CPU replacement.
To request a quotation for Siemens 6ES5103-8MA03, provide the required quantity and, where possible, a photograph of the original CPU nameplate. Contact Apexon Supply for legacy PLC sourcing, technical identification, and industrial replacement support.
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