Siemens 6AV3688-3EH47-0AX0

Brand: Siemens
Model: 6AV3688-3EH47-0AX0

Inventory situation: Goods are available in stock.

Product features

A top-notch SIMATIC HMI KP32F PN key panel made especially for industrial automation is the Siemens 6AV3688-3EH47-0AX0. Each of the 32 movable membrane keys on the Siemens 6AV3688-3EH47-0AX0 is connected to a multicolored LED indicator. Red, green, blue, yellow, and white are the five colors that these LEDs can display. Because they are easily adjustable in brightness, users can use the lights to quickly check the status of their devices. This model is ideal for situations requiring straightforward control because, in contrast to HMI panels with screens, it operates and provides feedback using physical keys and LEDs.

The Siemens 6AV3688-3EH47-0AX0 has two PROFINET interfaces and an integrated switch for connectivity. It can connect to Siemens controllers like the S7-1200, S7-1500, and S7-300/400 with ease thanks to its support for linear and ring network topologies. Additionally, it has four dedicated safety DI pins that satisfy SIL 2 or SIL 3 safety levels, as well as sixteen digital inputs (DI) and sixteen digital input/output (DI/DO) ports. Because of this, the key panel is perfect for safety control tasks like attaching safety door sensors or emergency stop buttons.

The Siemens 6AV3688-3EH47-0AX0 is capable of supporting loop-through power connections and is powered by 24V DC (voltage range: 20.4–28.8V DC) with a power consumption of 1A. This adds convenience for industrial use by eliminating the need to cut power when plugging it in or unplugging it. It is protected from dust and water by its IP65 rating on the front and IP20 on the back. It is robust in challenging industrial settings because it functions well in temperatures ranging from 0 to 55°C and can be stored in temperatures between -20 and 60°C.

Specifications

Model	6AV3688-3EH47-0AX0
Series	SIMATIC HMI KP32F PN
Operating elements	32 parametrizable short-stroke membrane keys
Display characteristics	No display
Front protection rating	IP65 (dustproof and waterproof)
Operating temperature	0–55 °C (vertical mounting)
Humidity	95% relative humidity (non-condensing)
Front dimensions	295 mm × 155 mm

Precautions

First off, there is no display screen on the Siemens 6AV3688-3EH47-0AX0. For operation and status feedback, it only uses 32 membrane keys and multicolored LEDs. Choose this key panel only for situations requiring basic physical control, like basic machine start/stop or safety signal triggering, as it is not appropriate for applications that require intricate interface monitoring or complex data visualization.

Second, the Siemens 6AV3688-3EH47-0AX0's power supply is essential. Whenever possible, use a 24V DC power source between 20.4 and 28.8V DC. Using a power source outside of this range may result in unstable operation or damage to the device. In order to prevent unexpected shutdowns of connected industrial equipment, the panel supports loop-through power connections for hot plugging. However, make sure the power is steady while plugging in and unplugging.

Third, before using, make sure it is compatible with communication. Siemens 6AV3688-3EH47-0AX0 has two integrated PROFINET interfaces and only supports the PROFINET protocol. It is incompatible with PROFIBUS, Modbus, and MPI protocols, but it functions flawlessly with Siemens controllers such as the S7-1200, S7-1500, and S7-300/400. Communication failures will occur if you try to connect it to controllers using these incompatible protocols.

FAQ

Q: What is Siemens 6AV3688-3EH47-0AX0?

A: The Siemens 6AV3688-3EH47-0AX0 is a SIMATIC HMI KP32F PN fail-safe key panel, designed as a rugged operator interface for industrial automation. The device features 32 short-stroke keys with multi-colored LEDs and integrates PROFINET communication with PROFIsafe for safety-critical applications. It is engineered for direct machine-level operator control and monitoring, offering a cost-effective solution for secure machine operation. The panel measures 295mm (W) x 155mm (H) x 69mm (D) and weighs approximately 1.83 kg, supporting both direct switchboard installation and mounting on third-party support arm and stand systems via flexible mechanics. This model is parameterizable as of STEP 7 V5.5 and later.

Q: What is the operating temperature range of Siemens 6AV3688-3EH47-0AX0?

A: The standard version of the Siemens 6AV3688-3EH47-0AX0 operates within a temperature range of 0°C to +55°C (32°F to 131°F). For extended environmental demands, the SIPLUS variant-based on the same 6AV3688-3EH47-0AX0 platform with conformal coating-expands the operating range down to -20°C, making the device suitable for cold storage, outdoor installations, and other low-temperature industrial environments.

Q: How does PROFIsafe integration work in Siemens 6AV3688-3EH47-0AX0?

A: The 6AV3688-3EH47-0AX0 integrates PROFIsafe directly into its PROFINET communication interfaces, enabling the transmission of safety-related data over standard industrial Ethernet without requiring separate safety wiring. The panel provides 4 dedicated safety DI pins that can connect to fail-safe emergency stop buttons or other safety signals at SIL2 or SIL3 integrity levels. This PROFIsafe integration, combined with the 16 configurable DI/DO pins, reduces wiring complexity while maintaining compliance with functional safety standards for machinery and process applications.

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