Application Scenarios
In a busy water treatment facility, operators often need to manually start and stop pumps, open valves, and acknowledge alarms in a noisy, damp environment while wearing gloves. The Siemens 6AV3688-3ED13-0AX0 is perfectly suited for this scenario. Its physical, tactile keys provide a definitive “click” that reassures the operator a command has been registered—a feeling absent with touchscreens. The IP65-rated front panel ensures it withstands water splashes and dust, while the 32 integrated LEDs can be driven directly by the PLC to provide immediate visual feedback on the status of each connected pump or valve .
A major pain point the 6AV3688-3ED13-0AX0 solves is the integration of a physical control panel into a modern PLC system. Traditionally, wiring each button and indicator light to a PLC I/O module consumes significant cabinet space, requires extensive wiring, and complicates troubleshooting. This product resolves this by acting as a compact PROFIBUS DP slave . In a recent case, an engineer used the 6AV3688-3ED13-0AX0 to replace a failing custom-built switchboard in a materials handling system. By connecting the panel directly to the S7-300 PLC via MPI , they eliminated hundreds of meters of control wiring, drastically reducing installation time and creating a much cleaner, more maintainable control architecture.
Parameters
| Main Parameters | Value/Description |
|---|---|
| Product Model | 6AV3688-3ED13-0AX0 (SIMATIC PP17-II) |
| Manufacturer | Siemens (SIMATIC HMI) |
| Product Category | Push Button Panel / Key Operator Panel – Screen-less HMI |
| Short-Stroke Keys | 32 keys, 1.5 million switching cycles each, with foil labeling |
| Integrated LEDs | 32 surface LEDs (Red/Yellow/Green tri-color) for status feedback |
| Digital Inputs | 16 x 24V DC (Direct keys as S7 input I/O) |
| Digital Outputs | 16 x 24V DC, 100mA per output (max. 500mA per group) |
| Communication | PROFIBUS DP (up to 12 Mbit/s) and MPI |
| Supply Voltage | 24V DC (Permissible range: 18V – 30V DC) |
| Total Output Power | 12W |
| Front Protection | IP65 (dust-tight and water-jet protected) |
| Housing Material | Aluminium |
| Mounting Cutout | 226 mm (W) x 190 mm (H), Depth: 53 mm |
| Operating Temp. | 0°C to +55°C (vertical mounting) |
| Configuration | STEP 7 Basic/Professional (TIA Portal) |
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