{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7312-1AE14-0AB0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7312-1AE14-0AB0","canonicalUrl":"https://aoctrl.com/siemens/6ES7312-1AE14-0AB0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7312-1AE14-0AB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC S7-300 CPU 312, order code 6ES7312-1AE14-0AB0, 64 DI/DO, MPI, RS485, 8 SFBs, programmable in LAD, FBD, SCL, STL, GRAPH, HiGraph.","salesMarkdown":"## What this CPU brings to the panel The 6ES7312-1AE14-0AB0 is a SIMATIC S7-300 CPU with 64 digital inputs and 64 digital outputs, MPI and RS485 interfaces, and supports programming in LAD, FBD, SCL, STL, GRAPH, and HiGraph. It includes 8 integrated SFBs. ## Key specs that matter The 8 SFBs (Type: SFB) handle common control tasks without extra coding. MPI (Multi-Point Interface) lets you link an HMI or another CPU; the separate RS485 port covers PROFIBUS or point-to-point talk. Operating range of 0 to 60 °C keeps it working in a typical cabinet, even sitting near hot drives. ## Integration notes Mounts on a standard S7-300 DIN-rail profile. Dimensions: 40 mm wide, 125 mm high, 130 mm deep. Power comes from the backplane bus; the CPU is isolated from the I/O side.","metaTitle":"6ES7312-1AE14-0AB0 S7-300 CPU 312, 64 I/O, MPI","metaDescription":"SIMATIC S7-300 CPU 312 with 64 DI/DO, MPI, RS485. 8 integrated SFBs. Programmable in LAD, FBD, SCL, STL, GRAPH, HiGraph. Sourced to order via RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["PLCs (Programmable Logic Controllers)"],"specifications":{"FM":"8","FBD":"Yes","I2t":"1 A²·s","LAD":"Yes","MPI":"Yes","SCL":"Yes","STL":"Yes","Max.":"60 °C","Min.":"0 °C","Type":"SFB","Depth":"130 mm","GRAPH":"Yes","Width":"40 mm","title":"6ES7312-1AE14-0AB0","Height":"125 mm","Inputs":"64","Number":"1","Preset":"10","RS 485":"Yes","STEP 7":"Yes; V5.2 SP1 or higher with HW update","via CP":"4","CP, LAN":"4","CP, PtP":"8","Forcing":"Yes","Outputs":"64","Overall":"6","Present":"Yes","Routing":"No","Isolated":"No","As Client":"Yes; Via CP and loadable FB","As Server":"Yes","HiGraph®":"Yes","PROFIsafe":"No","Retentive":"Yes; Must be restarted at each restart","Supported":"Yes; via CP and loadable FC","Variables":"Inputs, outputs, memory bits, DB, times, counters","Adjustable":"Yes; From 10 to 499","Expandable":"No","Integrated":"0","Size, max.":"256 byte","Command set":"see instruction list","Granularity":"1 h","Lower Limit":"10 ms","Racks, max.":"1","Single step":"Yes","Upper Limit":"9 990 s","description":"SIMATIC S7-300, CPU 312 Central processing unit with MPI, Integr. power supply 24 V DC, Work memory 32 KB, Micro Memory Card required","Number, max.":"see instruction list","Status block":"Yes; Up to 2 simultaneously","in AS, slave":"No","Plug-in (MMC)":"Yes","in AS, master":"Yes","to MPI, slave":"Yes","Interface type":"Integrated RS 485 interface","Nesting levels":"8","Software clock":"Yes","to MPI, master":"Yes","Can Be Read Out":"Yes","Inputs, default":"128 byte","Range of values":"0 to 2^31 hours (when using SFC 101)","Weight, approx.":"270 g","Without Battery":"Yes; Program and data","lifecycle_stage":"eol_hot","Block encryption":"Yes; With S7 block Privacy","Firmware version":"V3.3","Of Which Central":"64","Outputs, default":"128 byte","Power loss, typ.":"4 W","Rated value (DC)":"24 V","S7 communication":"Yes; Only server, configured on one side","PROFIBUS DP slave":"No","Repeat rate, min.":"1 s","Forcing, variables":"Inputs, outputs","Inputs, adjustable":"1 024 byte","PROFIBUS DP master":"No","Per Priority Class":"16","Retentivity preset":"Yes","Data record routing":"No","Number/Number range":"0","Outputs, adjustable":"1 024 byte","PG/OP communication":"Yes","Plug-in (MMC), max.":"8 Mbyte","Programming package":"STEP 7 V5.5 + SP1 or higher or STEP 7 V5.2 + SP1 or higher with HSP 218","HW functional status":"01","Inrush current, typ.":"3.5 A","Number of breakpoints":"4","Number of startup OBs":"1; OB 100","Retentivity available":"Yes; MB 0 to MB 255","Modules per rack, max.":"8","Retentivity adjustable":"Yes; via non-retain property on DB","S7 basic communication":"Yes","System functions (SFC)":"see instruction list","Deviation per day, max.":"10 s; Typ.: 2 s","Number of analog inputs":"0","Number of entries, max.":"500","Status/control variable":"Yes","Transmission rate, max.":"187.5 kbit/s","User data per job, max.":"180 byte; With PUT/GET","For Bit Operations, Typ.":"0.1 µs","Number of GD loops, max.":"8","Number of analog outputs":"0","Number of blocks (total)":"1 024; (DBs, FCs, FBs); the maximum number of loadable blocks can be reduced by the MMC used.","Number of clock memories":"8; 1 memory byte","Number of digital inputs":"0","Number of free cycle OBs":"1; OB 1","Number of time alarm OBs":"1; OB 10","Of Which Powerfail-Proof":"100; Only the last 100 entries are retained","Per Priority Class, Max.":"32 kbyte; Max. 2 KB per block","Size of GD packets, max.":"22 byte","For Word Operations, Typ.":"0.24 µs","Global data communication":"Yes","Number of delay alarm OBs":"2; OB 20, 21","Number of digital outputs":"0","Number of variables, max.":"10","Point-to-point connection":"No","Number of GD packets, max.":"8","Number of RS 422 interfaces":"0","Number of RS 485 interfaces":"1; MPI","Number of process alarm OBs":"1; OB 40","Process diagnostic messages":"Yes","S7 communication, as client":"No","S7 communication, as server":"Yes","usable for OP communication":"5","usable for PG communication":"5","Retentive And Synchronizable":"No; Buffered: No, Can be synchronized: Yes","System function blocks (SFB)":"see instruction list","Number of PROFINET interfaces":"0","additional within an error OB":"4","reserved for OP communication":"1","reserved for PG communication":"1","Number of cyclic interrupt OBs":"4; OB 32, 33, 34, 35","Number of expansion units, max.":"0","Number of synchronous error OBs":"2; OB 121, 122","Of Which Status Variables, Max.":"30","For Fixed Point Arithmetic, Typ.":"0.32 µs","Number of asynchronous error OBs":"4; OB 80, 82, 85, 87","Of Which Control Variables, Max.":"14","Current consumption (rated value)":"650 mA","usable for S7 basic communication":"2","For Floating Point Arithmetic, Typ.":"1.1 µs","permissible range, lower limit (DC)":"19.2 V","permissible range, upper limit (DC)":"28.8 V","reserved for S7 basic communication":"0","Number of GD packets, receiver, max.":"8","Output current of the interface, max.":"200 mA","adjustable for OP communication, max.":"5","adjustable for OP communication, min.":"1","adjustable for PG communication, max.":"5","adjustable for PG communication, min.":"1","Number of GD packets, transmitter, max.":"8","Number of entries readable in RUN, max.":"499","Behavior of the clock following POWER-ON":"the clock continues at the time of day it had when power was switched off","Mains/voltage failure stored energy time":"5 ms","Number of industrial Ethernet interfaces":"0","simultaneously active Alarm-S blocks, max.":"300","User program protection/password protection":"Yes","adjustable for S7 basic communication, max.":"2","adjustable for S7 basic communication, min.":"0","Size of GD packet (of which consistent), max.":"22 byte","User data per job (of which consistent), max.":"240 byte; as server","Current consumption (in no-load operation), typ.":"140 mA","Number of login stations for message functions, max.":"6; Depending on the configured connections for PG/OP and S7 basic communication","Data management on MMC (after last programming), min.":"10 a","Retentive data area (incl. timers, counters, flags), max.":"32 kbyte","External Protection For Power Supply Lines (Recommendation)":"2 A min."}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$133.33","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/070e14856ee6e604dc6dc231bae06d0a.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=517602&mlfb=6ES7312-1AE14-0AB0"},"ai":{"faq":[{"question":"What does the FM 8 spec mean?","answer":"It means the CPU has 8 integrated system function blocks (SFB) for routines like diagnostics or communication without extra code."},{"question":"Does this CPU support FBD programming?","answer":"Yes, FBD (Function Block Diagram) is supported, along with LAD, SCL, STL, GRAPH, and HiGraph."},{"question":"What are the digital I/O counts?","answer":"It supports 64 digital inputs and 64 digital outputs."},{"question":"What communication interfaces does it have?","answer":"It has an MPI port and an RS485 interface. Extended communication is possible via CP modules (up to 4 CP LAN, 8 CP PtP)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7312-1AE14-0AB0","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/6ES7312-1AE14-0AB0 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}}