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The Siemens 6ES5371-0AA51 Card Module serves as a function expansion unit for SIMATIC S5 systems. This card module adds specialized control capabilities to the base CPU. You will find it in high-density I/O applications requiring extra processing power. It connects directly to the S5 backplane through a standard edge connector. Therefore, this unit expands system functionality without occupying additional I/O slots.
The Siemens 6ES5371-0AA51 Card Module measures 160 mm in height and 48 mm in width. Its depth reaches 180 mm for standard rack mounting. The unit weighs approximately 0.52 kilograms. It contains one 16-bit processor and 64 KB of dedicated memory. Three independent function blocks run simultaneously on this card. Additionally, you get four status LEDs for operational diagnostics.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer | Siemens AG |
| Model | 6ES5371-0AA51 |
| Product Type | Card Module |
| Processor | 16-bit @ 16 MHz |
| Dedicated Memory | 64 KB RAM |
| Function Blocks | 3 (independent) |
| Processing Speed | 2 ms per block |
| Backplane Interface | 40-pin edge connector |
| Power Consumption | 180 mA @ 5 VDC |
| Height | 160 mm |
| Width | 48 mm |
| Depth | 180 mm |
| Weight | 0.52 kg |
| Status LEDs | 4 (PWR, RUN, FB0, FB1) |
| Energy Storage | ≈ 150 µF (capacitive) |
| Operating Temperature | 0°C to +60°C |
| Mounting Method | S5 rack |
| Configuration | STEP 5 software |
Internal Architecture and Energy Storage
The Siemens 6ES5371-0AA51 Card Module stores minimal energy in its power filter. Small electrolytic capacitors hold approximately 150 microfarads total capacitance. A 16-bit processor handles all function block calculations independently. This processor runs three separate control blocks without CPU intervention. Each block executes its logic in just 2 milliseconds. The card includes 64 KB of dedicated RAM for block parameters and results. Four optical isolators protect the backplane from internal fault conditions. Four LEDs show power, processor run, and function block status clearly. A green RUN LED lights up when the card processor executes normally.
Connection Interfaces and Installation Details
You will find a 40-pin edge connector at the bottom of this card module. Insert this connector directly into any available S5 rack slot. Align the card module with the upper and lower card guides. Press firmly until the backplane connector seats completely. The Siemens 6ES5371-0AA51 Card Module draws all power from the backplane. No external wiring or power supply connects to this card. Secure the front panel with the two retaining screws after insertion. Four LEDs indicate power, run, and function block status. A green FB0 LED lights up when function block 0 executes. A green FB1 LED lights up when function block 1 executes.
Configuration and Operation Steps
You power off the PLC system before inserting this card module. First, select an empty slot in the SIMATIC S5 rack. Then, slide the card module into the selected slot guides. Push the card firmly until the edge connector seats correctly. Secure the front panel with the two retaining screws. The Siemens 6ES5371-0AA51 Card Module automatically powers up with the system. Use the STEP 5 software to configure the three function blocks. Define the block parameters (inputs, outputs, and logic) for each one. Download the configuration to the card’s dedicated memory. The card executes all three blocks independently every scan cycle. Monitor the status LEDs to verify correct operation of each function block.