{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK7271-1AA30-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK7271-1AA30-0AA0","canonicalUrl":"https://aoctrl.com/siemens/3RK7271-1AA30-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RK7271-1AA30-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 3RK7271-1AA30-0AA0 AS-Interface data decoupling unit, 30 mm width, 120 W, 4 A output, IP20, DIN rail or wall mount.","salesMarkdown":"## What this module does in the AS-Interface network The Siemens 3RK7271-1AA30-0AA0 is an AS-Interface data decoupling unit designed as a 30 mm communication module for the SIMATIC S7-1200 PLC family. It sits between the AS-Interface power supply and the AS-i network, decoupling the data signal from the 24 V DC power rail so the PLC can communicate on the yellow AS-i cable without interference. It accepts a 21–32 V DC input (24 V DC nominal) and supplies up to 120 W of active power, with a maximum input current of 4.1 A and a maximum output current of 4 A. That 4 A output feeds the AS-i bus and any powered slaves downstream. The module supports both grounded and non-grounded AS-i networks and includes ground fault detection — a useful diagnostic when you're chasing intermittent faults on a long bus run. ## Mounting and panel fit — DIN rail or wall Fastens onto 35-mm DIN rail or mounts directly to a panel backplate using the plug-in flaps on the housing. The 30 mm width and 75 mm depth keep it compact — it takes up one standard S7-1200 module slot width on the rail. Mounting position can be vertical or horizontal, which gives flexibility in tight cabinets. IP20 protection class means it belongs inside a sealed enclosure — not exposed to washdown or dust. Wire termination accepts 0.2–3.3 mm² solid conductors (24–16 AWG) with core end processing. The three-terminal layout handles the AS-i power in, AS-i power out, and the data coupling connection. ## Protection and diagnostics built in Short-circuit protection is electronic, and the single AS-Interface output is short-circuit proof — meaning a fault on the bus won't take out the module itself. It auto-resets after the fault clears, so a momentary short on the yellow cable doesn't require a manual power cycle. Three LEDs on the front panel give status: EFD (earth fault detection), ASI OL (AS-Interface overload), and DIAG (general diagnostic). If the DIAG LED is solid, the module has power and is communicating — if it's flashing, you've got a bus fault or a missing slave. Operating temperature range is 0–55 °C, storage from -40–70 °C, with up to 95% relative humidity at 25 °C. That covers most indoor industrial cabinets without active cooling. ## What this module is NOT — safety circuit warning This unit is explicitly not suitable for use in safety-related circuits. If you're building a safety AS-i network with a safety monitor, you need a different decoupling module or a separate safety-rated power supply. The 3RK7271-1AA30-0AA0 is for standard AS-Interface data decoupling only. It has no external reset input, no reset function, no sequential time-delay, and no test function for signaling contacts. The auto-reset on short-circuit is its only automatic recovery feature. The 0.05 A rating at DC-13 (24 V) applies to any auxiliary signaling contacts — this is a very low switching capacity, so don't plan on driving loads directly from the module's signal path. ## Lifecycle and sourcing — active production The reference code per EN 61346-2 is 'A', which maps to the AS-Interface system function in the standard equipment designation scheme. This matters for documentation traceability if your panel drawings follow that standard.","metaTitle":"Siemens 3RK7271-1AA30-0AA0 AS-Interface Data Decoupling","metaDescription":"Siemens 3RK7271-1AA30-0AA0 AS-Interface data decoupling unit for SIMATIC S7-1200. 120W supply, 4A output, IP20, DIN rail. Active production — quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Remote I/O & Fieldbus Modules"],"specifications":{"Depth":"75mm","Solid":"3x (0.2 ... 3.3 mm²)","Width":"30mm","title":"3RK7271-1AA30-0AA0","Height":"100mm","auto-RESET":"Yes","Rated Value":"21 ... 32V","description":"SIMATIC S7-1200, DCM 1271 Data decoupling module for AS-i Master CM 1243-2 IN: 24 V / 30 V DC OUT: 1x AS-Interface, 4 A Integrated overload protection integr. ground fault detection Signaling contact","During Storage":"-40 ... +70°C","External Reset":"No","Reset Function":"No","lifecycle_stage":"current","During Operation":"0 ... 55°C","Fastening Method":"35-mm DIN rail mounting or wall mounting with plug-in flaps","at DC-13 at 24 V":"0.05A","Mounting Position":"vertical, horizontal","2 at DC rated value":"24V","Product Designation":"AS-Interface data decoupling unit","protection class IP":"IP20","Of The Input Voltage":"DC","Design Of The Product":"Communication module 30 mm for SIMATIC S7-1200","Of The Input Voltages":"DC","Supplied Active Power":"120W","Ground Fault Detection":"Yes","With Core End Processing":"3x (0.2 ... 3.3 mm²)","suitable for AS-i Power24V":"Yes","input current at DC maximum":"4.1A","AS-Interface data decoupling":"Yes","output current at DC maximum":"4A","Sequential Connected Time-Delay":"No","Design Of Short-Circuit Protection":"electronic","Test Function Of Signaling Contacts":"No","suitable for grounded AS-i networks":"Yes","at AWG cables for auxiliary contacts":"3x (24 ... 16)","adapted for non-grounded AS-i networks":"Yes","reference code according to EN 61346-2":"A","display version as status display by LED":"EFD, ASI OL, DIAG","Property Of The Output Short-Circuit Proof":"Yes","number of outputs for AS-Interface maximum":"1","Suitability For Use Safety-Related Circuits":"No","protocol is supported AS-Interface protocol":"Yes","relative humidity at 25 °C during operation maximum":"95%","Number Of Electrical Connections For Signaling Contact":"3","Installation Altitude At Height Above Sea Level Maximum":"2 000m","Type Of Electrical Connection For Auxiliary And Control Circuit":"screw-type terminals","design of the switching contact as NO contact for signaling function":"No","Product Component Removable Terminal For Auxiliary And Control Circuit":"Yes","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"4 ... 4A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$97.79","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/cf561fc5317cacc360a0fb13a22c796e.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=242593&mlfb=3RK7271-1AA30-0AA0"},"ai":{"faq":[{"question":"What is the 3RK7271-1AA30-0AA0 used for?","answer":"It is an AS-Interface data decoupling unit for the SIMATIC S7-1200. It sits between the AS-i power supply and the AS-i network, separating the data signal from the 24 V DC power rail so the PLC can communicate on the AS-i cable without interference. It supplies up to 120 W and 4 A to the bus."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK7271-1AA30-0AA0","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/3RK7271-1AA30-0AA0 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}}