{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6AG1688-3AF37-2AX0","brand":"Siemens","brandSlug":"siemens","productSlug":"6AG1688-3AF37-2AX0","canonicalUrl":"https://aoctrl.com/siemens/6AG1688-3AF37-2AX0","factsUrl":"https://aoctrl.com/api/mcp/products/6AG1688-3AF37-2AX0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens, SIMATIC ET 200pro, PROFIsafe F-module, 6AG1688-3AF37-2AX0, PROFINET IRT, MRP, SIL 3, IP20, mounting clip, 49 mm depth.","salesMarkdown":"## Safety-rated PROFINET F-module for distributed I/O The Siemens 6AG1688-3AF37-2AX0 is a PROFIsafe F-module in the SIMATIC ET 200pro family, designed for safety-related shutdown and monitoring in distributed automation. It communicates over PROFINET with IRT and MRP, so it participates in isochronous real-time motion networks and media-redundant ring topologies without a separate safety bus. The safety logic supports one SIL 3 channel (two-channel sensor evaluation) or two independent SIL 2 channels (single-channel sensors) for emergency-stop and guard-monitoring circuits. That means a single module can handle a dual-channel estop pair or two separate single-channel safety mats without an additional safety CPU slot. ## Controller compatibility and fieldbus fit This F-module integrates natively with S7-1500 and S7-1200 controllers, including ET 200pro and ET 200S CPUs. For S7-300/400 systems, it requires an F-CPU and STEP 7 V11 SP1 or higher with the Safety V11 option package. It does not support PROFIBUS, DeviceNet, EtherNet/IP, MODBUS, CAN, or AS-Interface — the only fieldbus is PROFINET. Mounts via a clip onto the ET 200pro base unit. Overall depth is 49 mm including the angled SIMATIC Ethernet connector, so factor that into the enclosure depth when laying out the IP20-rated rear section. Rated for ambient operation from -20 °C to 60 °C. The rear side carries IP20 protection, meaning it is suitable for dry, enclosed control cabinets — not for washdown or outdoor deployment. CE marked; no RoHS/REACH or UL listing appears in the available documentation.","metaTitle":"Siemens 6AG1688-3AF37-2AX0 PROFIsafe F-module, PROFINET IRT,","metaDescription":"Siemens 6AG1688-3AF37-2AX0 PROFIsafe F-module. PROFINET IRT & MRP. SIL 3 (two-channel) or 2x SIL 2. IP20. S7-1200/1500/300/400 compatible. Quoted to order. CE marked.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["HMI Operator Interfaces"],"specifications":{"CAN":"No","IRT":"Yes","MPI":"No","MRP":"Yes","Red":"Yes","Blue":"Yes","Max.":"60 °C","Min.":"-20 °C","Green":"Yes","LOGO!":"No","White":"Yes","WinAC":"Yes","title":"6AG1688-3AF37-2AX0","MODBUS":"No","S7-200":"No","SERCOS":"No","TCP/IP":"No","Yellow":"Yes","CE mark":"Yes","EIB/KNX":"No","Plastic":"Yes","S7-1200":"Yes; with ET 200pro CPU and ET 200S CPU","S7-1500":"Yes","SUCOnet":"No","Aluminum":"No","INTERBUS":"No","PROFIBUS":"No","PROFINET":"Yes; also 3rd party PLC","SIMOTION":"No","DeviceNet":"No","IP (rear)":"IP20","PROFIsafe":"Yes; 1x SIL 3 (two-channel) or 2x SIL 2 (single-channel) emergency stop sensors","SINUMERIK":"No","S7-300/400":"Yes; with F-CPU: STEP 7 V11 SP1 (or higher) and Safety V11 (or higher) or SIMATIC STEP 7 Basic V11 (or higher)","EtherNet/IP":"No","SafetyBUS p":"No","description":"SIPLUS HMI KP8F PN based on 6AV3688-3AF37-0AX0 with conformal coating, -20...+55 °C, Key Panel, 8 short-stroke switches with multi-colored LEDs, PROFINET interfaces with PROFIsafe, 8 DI/DO and 2 safety DI pins, 24 V DC can be looped through parameterizable as of STEP 7 V5.5","AS-Interface":"No","Data-Highway":"No","PROFINET CBA":"No","Mounting type":"Mounting clip","Overall depth":"49 mm; Incl. angled SIMATIC Ethernet connector","Rack mounting":"No","Rail mounting":"No","Front mounting":"Yes; Compatible with Extension Units dimensions","INTERBUS-Safety":"No","Illuminant test":"Yes; During switch on","Mitsubishi (FX)":"No","Stainless steel":"No","lifecycle_stage":"current","DeviceNet Safety":"No","LEDs (ON period)":"100 %","Modicon (Modbus)":"No","OMRON (FINS TCP)":"No","Rated value (DC)":"24 V; Non-isolated","IP (at the front)":"IP65","Mounting position":"vertical","Other Bus Systems":"No","Allen Bradley (DF1)":"No","Bureau Veritas (BV)":"No","Foundation Fieldbus":"No","Mitsubishi (MC TCP/IP)":"No","Mounting cutout, width":"68 mm; Max. thickness of mounting plate 2 - 6 mm","OMRON (LINK/Multilink)":"No","Type of supply voltage":"DC","Current per group, max.":"800 mA","Germanischer Lloyd (GL)":"No","Height of housing front":"155 mm","Local Operating Network":"No","Modicon (Modbus TCP/IP)":"No","Mounting cutout, height":"129 mm","Number of function keys":"8","Det Norske Veritas (DNV)":"No","Key and signal lamp test":"Yes; automatically when switching on","Number of digital inputs":"8; Total inputs and outputs max. 8 and 1x SIL 2 or 2x SIL 3","Short-circuit protection":"Yes","Current per channel, max.":"100 mA","Number of digital outputs":"8; Max. 8 inputs and outputs (total)","STEP 7 Basic (TIA Portal)":"Yes","With Resistive Load, Max.":"100 mA","With parameterizable keys":"Yes","Weight (without packaging)":"280 g","Width of the housing front":"98 mm","AS-Interface Safety at Work":"No","Allen Bradley (EtherNet/IP)":"No","At maximum tilt angle, max.":"45 °C","At maximum tilt angle, min.":"-20 °C","Number of short-stroke keys":"8","Polski Rejestr Statkow (PRS)":"No","Enclosure Type 4 at the front":"No","Number of PROFINET interfaces":"2; Incl. switch","Number of color modes for LED":"5; red, green, blue, yellow, white","Suitable for safety functions":"Yes","Wall mounting/direct mounting":"No","Enclosure Type 4x at the front":"Yes; Incl. NEMA12","Industrial Ethernet status LED":"2; Per port","Nippon Kaiji Kyokai (Class NK)":"No","For vertical installation, max.":"55 °C","For vertical installation, min.":"-20 °C","STEP 7 Professional (TIA Portal)":"Yes","American Bureau of Shipping (ABS)":"No","Current consumption (rated value)":"0.3 A","Lloyds Register of Shipping (LRS)":"No","Supports protocol for PROFINET IO":"Yes","Direct keys (keys as S7 input I/O)":"8","User-Definable Label Membrane Keys":"Yes","permissible range, lower limit (DC)":"20.4 V","permissible range, upper limit (DC)":"28.8 V","Mounting in portrait format possible":"Yes","Mounting in landscape format possible":"Yes","DP direct LEDs (LEDs as S7 output I/O)":"8; Adjustable brightness","Short-stroke keys (in switching cycles)":"1 500 000","Number of industrial Ethernet interfaces":"2; For the construction of lines and rings without external switch","Number of ports of the integrated switch":"2; Per port","Limit class A, for use in industrial areas":"Yes; Group 1, measured at a distance of 10 m","Installation altitude above sea level, max.":"2 000 m","Limit class B, for use in residential areas":"No","Protection against fouling acc. to EN 60664-3":"Yes; Type 1 protection","Ambient air temperature-barometric pressure-altitude":"Tmin ... Tmax at 1 140 hPa ... 795 hPa (-1 000 m ... +2 000 m)","Number of slots for command devices and signaling units":"0","Resistant to commercially available coolants and lubricants":"Yes; Incl. diesel and oil droplets in the air","Maximum Permissible Angle Of Inclination Without External Ventilation":"30°; To the front/rear","Qualification and Performance of Electrical Insulating Compound for Printed Board Assemblies according to IPC-CC-830A":"Yes; Conformal coating, Class A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1,692.56 – $1,753.01","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/b42e47202966c2851ab22e7ae1d2e8bc.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1356939&mlfb=6AG1688-3AF37-2AX0"},"ai":{"faq":[{"question":"What is the closest functional second-source for 6AG1688-3AF37-2AX0?","answer":"There is no direct second-source equivalent listed. The closest functional cross-reference would be a standard SIMATIC ET 200pro F-module from the 6ES7 series, but those lack the SIPLUS extended temperature range and coating that the 6AG prefix typically denotes. Physical fit and wiring are identical — the base unit, backplane, and connector pinout are shared — but a standard 6ES7 variant does not carry the same -20 °C to 60 °C rating."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6AG1688-3AF37-2AX0","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/siemens/6AG1688-3AF37-2AX0 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}