What Is a Programmable Logic Controller and How Does It Work
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The Siemens 6AV3688-3AY36-0AX0 SIMATIC HMI KP8 PN is a key panel with 8 short-stroke switches and multicolor LEDs, offering 8 configurable digital I/O pins over two PROFINET interfaces with an integrated switch. It runs on 24 V DC that can be looped through the connector without interruption, and it carries an IP65 front rating for panel-mount machine control.
The 8-key count and 8 direct S7 I/O pins fit machine stations that need a compact operator interface without a full graphic HMI screen for example start/stop, jog, and mode-select buttons wired straight into the PLC over PROFINET. Because the two PROFINET ports include a built-in switch, the KP8 PN can sit in a line or ring topology without an external switch, which simplifies cabinet wiring versus a panel that needs its own network hardware. Choose the larger KP32F PN key panel instead when the application needs more than 8 keys or PROFIsafe-rated safety inputs.
Clamp-terminal mounting and the IP65 front rating suit this panel for direct front-of-cabinet or machine-frame installation in wash-down or dusty production areas, while ATEX Zone 2/22 and cULus Class I Division 2 markings on the family extend use to hazardous-area machine control stations.
| Product type designation | KP8 PN |
|---|
| With parameterizable keys | Yes |
|---|---|
| Membrane keyboard: user-definable label membrane keys | Yes |
| Function keys: Number of function keys | 8 |
| Short-stroke keys: Number of short-stroke keys | 8 |
| Expansions for operator control of the process: DP direct LEDs (LEDs as S7 output I/O) | 8; Adjustable brightness |
| Expansions for operator control of the process: Number of color modes for LED | 5; red, green, blue, yellow, white |
| Expansions for operator control of the process: Direct keys (keys as S7 input I/O) | 8 |
| Mounting type | Clamp terminals |
|---|---|
| Mounting position | vertical |
| Rack mounting | No |
| Front mounting | Yes; Compatible with Extension Units dimensions |
| Rail mounting | No |
| Wall mounting/direct mounting | No |
| Mounting in portrait format possible | Yes |
| Mounting in landscape format possible | Yes |
| maximum permissible angle of inclination without external ventilation | 30°; To the front/rear |
| Number of slots for command devices and signaling units | 0 |
| Part number | 6AV3688-3AY36-0AX0 |
|---|---|
| Type designation | KP8 PN |
| Brand | Siemens |
| Condition | New, factory sealed |
| Source | Siemens and its authorised distributors |
| Warranty | Manufacturer warranty |
| Lifecycle status | Active, in production |
| EAN | 4025515079156 |
| ETIM class | EC001415 |
| eCl@ss | 27330204 |
| Type of supply voltage | DC |
|---|---|
| Rated value (DC) | 24 V; 24 V looped through at connector, no interruption on pulling |
| permissible range, lower limit (DC) | 20.4 V |
| permissible range, upper limit (DC) | 28.8 V |
| Current consumption (rated value) | 0.3 A |
|---|
| Number of digital inputs | 8; Max. 8 inputs and outputs (total) |
|---|---|
| Input voltage: Rated value (DC) | 24 V |
| Number of digital outputs | 8; Max. 8 inputs and outputs (total) |
|---|---|
| Short-circuit protection | Yes |
| Switching capacity of the outputs: with resistive load, max. | 100 mA |
| Output voltage: Rated value (DC) | 24 V; Non-isolated |
| Total current of the outputs: Current per channel, max. | 100 mA |
| Total current of the outputs: Current per group, max. | 800 mA |
| Number of industrial Ethernet interfaces | 2; For the construction of lines and rings without external switch |
|---|---|
| Number of PROFINET interfaces | 2; Incl. switch |
| Industrial Ethernet: Industrial Ethernet status LED | 2; Per port |
| Industrial Ethernet: Number of ports of the integrated switch | 2; Per port |
| PROFINET | Yes; also 3rd party PLC |
|---|---|
| Supports protocol for PROFINET IO | Yes |
| PROFINET CBA | No |
| IRT | Yes |
| PROFIsafe | No |
| PROFIBUS | No |
| EtherNet/IP | No |
| MPI | No |
| AS-Interface | No |
| EIB/KNX | No |
| Protocols (Ethernet): TCP/IP | No |
| Redundancy mode Media redundancy: MRP | Yes |
| Further protocols: AS-Interface Safety at Work | No |
| Further protocols: CAN | No |
| Further protocols: Data-Highway | No |
| Further protocols: DeviceNet | No |
| Further protocols: DeviceNet Safety | No |
| Further protocols: Foundation Fieldbus | No |
| Further protocols: INTERBUS | No |
| Further protocols: INTERBUS-Safety | No |
| Further protocols: Local Operating Network | No |
| Further protocols: MODBUS | No |
| Further protocols: SafetyBUS p | No |
| Further protocols: SERCOS | No |
| Further protocols: SUCOnet | No |
| Further protocols: other bus systems | No |
| Illuminant test | Yes; During switch on |
|---|---|
| Key and signal lamp test | Yes; automatically when switching on |
| Emission of radio interference acc. to EN 55 011: Limit class A, for use in industrial areas | Yes; Group 1, measured at a distance of 10 m |
|---|
| IP (at the front) | IP65 |
|---|---|
| IP (rear) | IP20 |
| NEMA (front): Enclosure Type 4 at the front | No |
| NEMA (front): Enclosure Type 4x at the front | Yes; Incl. NEMA12 |
| CE mark | Yes |
|---|---|
| cULus | Yes |
| RCM (formerly C-TICK) | Yes |
| KC approval | Yes |
| Suitable for safety functions | No |
| Use in hazardous areas: ATEX Zone 2 | Yes |
| Use in hazardous areas: ATEX Zone 22 | Yes |
| Use in hazardous areas: cULus Class I Zone 1 | No |
| Use in hazardous areas: cULus Class I Zone 2, Division 2 | Yes |
| Use in hazardous areas: FM Class I Division 2 | Yes |
| Marine approval: Germanischer Lloyd (GL) | No |
| Marine approval: American Bureau of Shipping (ABS) | No |
| Marine approval: Bureau Veritas (BV) | No |
| Marine approval: Det Norske Veritas (DNV) | No |
| Marine approval: Lloyds Register of Shipping (LRS) | No |
| Marine approval: Nippon Kaiji Kyokai (Class NK) | No |
| Marine approval: Polski Rejestr Statkow (PRS) | No |
| Ambient temperature during operation: min. | 0 °C |
|---|---|
| Ambient temperature during operation: max. Operation (vertical installation) | 55 °C |
| Ambient temperature during operation: For vertical installation, min. | 0 °C |
| Ambient temperature during operation: At maximum tilt angle, min. | 0 °C |
| Ambient temperature during storage/transportation: min. | -20 °C |
| Ambient temperature during storage/transportation: max. | 60 °C |
| Relative humidity: Operation, max. | 95 %; no condensation |
| Configuration software: STEP 7 Basic (TIA Portal) | Yes |
|---|---|
| Configuration software: STEP 7 Professional (TIA Portal) | Yes |
| Process coupling: S7-1200 | Yes; with ET 200pro CPU and ET 200S CPU |
|---|---|
| Process coupling: S7-1500 | Yes |
| Process coupling: S7-200 | No |
| Process coupling: S7-300/400 | Yes; STEP 7 or SIMATIC STEP 7 Basic V11 or higher |
| Process coupling: LOGO! | No |
| Process coupling: WinAC | Yes |
| Process coupling: SINUMERIK | No |
| Process coupling: SIMOTION | No |
| Process coupling: Allen Bradley (EtherNet/IP) | No |
| Process coupling: Allen Bradley (DF1) | No |
| Process coupling: Mitsubishi (MC TCP/IP) | No |
| Process coupling: Mitsubishi (FX) | No |
| Process coupling: OMRON (FINS TCP) | No |
| Process coupling: OMRON (Host Link) | No |
| Process coupling: Modicon (Modbus TCP/IP) | No |
| Process coupling: Modicon (Modbus RTU) | No |
| Enclosure material (front): Plastic | Yes |
|---|---|
| Enclosure material (front): Aluminum | No |
| Enclosure material (front): Stainless steel | No |
| Service life: Short-stroke keys (in switching cycles) | 1 500 000 |
| Service life: LEDs (ON period) | 100 % |
| Width of the housing front | 98 mm |
|---|---|
| Height of housing front | 155 mm |
| Mounting cutout, width | 67.7 mm; Max. thickness of mounting plate 2 - 6 mm |
| Mounting cutout, height | 129.7 mm |
| mounting depth | 49 mm; Incl. angled SIMATIC Ethernet connector |
| Weight (without packaging) | 270 g |
|---|
| Net weight | 0.306 kg |
|---|---|
| Country of origin | DE |
| Shipping weight | 0.806 kg |
| Ships from | Türkiye |
| Dispatch | — |
| Stock | On request |
Source: manufacturer data · Last verified: 01 Nov 2026
No documents are on file for this part yet.
Ask us for the datasheetThe rated current of KP8 PN is 0.3 A.
The rated operational voltage of KP8 PN is 24; 24 looped through at connector, no interruption on pulling V AC.
The tariff (HS) code on file for KP8 PN is 85371098.
The EAN (GTIN) of KP8 PN is 4025515079156.
KP8 PN ships from Türkiye. Shipping calculated at checkout · import duties and taxes paid on arrival.
Learn how a PLC works, including scan cycle, I/O sizing, IEC 61131-3 programming, and hardware selection for ABB, Schneider, and Siemens. Shop at Stoklink.
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