{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7151-7AA21-0AB0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7151-7AA21-0AB0","canonicalUrl":"https://aoctrl.com/siemens/6ES7151-7AA21-0AB0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7151-7AA21-0AB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 6ES7151-7AA21-0AB0, PROFIBUS DP master module (SFB), DPV1, 244-byte I/O, 128 KB integrated memory, isolated RS-485, 6-week backup at 40°C.","salesMarkdown":"## What this module delivers Siemens 6ES7151-7AA21-0AB0 is a PROFIBUS DP master module classified as SFB type. It handles 244 bytes of input data and 244 bytes of output data per cycle, giving a defined capacity for process image exchange. Integrated 128 kbyte memory retains data for up to six weeks at 40 °C ambient, so the module holds its program and parameters through short power outages without an external backup battery. The RS-485 bus interface is isolated, common-mode noise won't couple onto the backplane. Diagnostic functions include alarms, forcing of I/O, routing, and retentive variables that require a restart after power cycle. Multiple programming languages are available as option slots: CFC, SCL, GRAPH, HiGraph, plus the base set of LAD, STL, and FBD. ## Panel fit and electrical coordination The module has a width of 60 mm; the DP master component itself occupies 35 mm of that – account for the full 60 mm when laying out the DIN rail and enclosure clearance. Depth is 75 mm and height 119.5 mm, standard for S7-300 form factor. I2t is 0.09 A²·s – use this value for selective coordination of the module's supply circuit with upstream protection. Forcing and alarms are enabled, which means during commissioning you can override I/O states without altering the program logic for troubleshooting.","metaTitle":"Siemens 6ES7151-7AA21-0AB0 Profibus DP Master DPV1 SFB","metaDescription":"Siemens 6ES7151-7AA21-0AB0 Profibus DP master (SFB) with DPV1, 244 byte I/O, 128 KB memory, 6-week backup, isolated RS-485. RFQ for BOM line.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["PLC Communication Modules"],"specifications":{"CFC":"Yes; Optional","FBD":"Yes","I2t":"0.09 A²·s","LAD":"Yes","MPI":"No","SCL":"Yes; Optional","STL":"Yes","DPV1":"Yes","Type":"SFB","Depth":"75 mm","GRAPH":"Yes; Optional","Width":"60 mm; DP master module: 35 mm","title":"6ES7151-7AA21-0AB0","Alarms":"Yes","Height":"119.5 mm","Inputs":"244 byte","Number":"1","Preset":"10","RS 485":"Yes","TCP/IP":"No","Forcing":"Yes","Outputs":"244 byte","Overall":"12","Present":"Yes","Routing":"Yes","GSD file":"The latest GSD file is available on the Internet (http://www.siemens.com/profibus-gsd)","Isolated":"Yes","As Client":"No","As Server":"Yes","HiGraph®":"Yes; Optional","Retentive":"Yes; Must be restarted at each restart","Supported":"Yes","Variables":"Inputs, outputs, memory bits, DB, times, counters","Adjustable":"Yes","Expandable":"No","Integrated":"128 kbyte","Size, max.":"256 byte","Backup time":"6 wk; At 40 °C ambient temperature, typically","Command set":"see instruction list","Granularity":"1 h","Lower Limit":"1 ms","STEP 7 Lite":"No","SYNC/FREEZE":"Yes","Single step":"Yes","Upper Limit":"6 000 ms","description":"SIMATIC DP, IM151-7 CPU for ET200S, 128 KB work memory with integrated PROFIBUS DP interface (9-pole D-sub socket) as DP slave, without battery SIMATIC MMC required","Equidistance":"Yes","Inputs, max.":"244 byte","Number, max.":"See S7-300 operation list","Status block":"Yes; Up to 2 simultaneously","in AS, slave":"No","to DP, slave":"Yes","Outputs, max.":"244 byte","Plug-in (MMC)":"Yes","in AS, master":"No","to DP, master":"Yes; With DP slave only slave clock","to MPI, slave":"Yes","Interface type":"External interface via master module 6ES7138-4HA00-0AB0","Nesting levels":"8","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.":"200 g; DP master module: Approx. 100 g","lifecycle_stage":"current","Block encryption":"Yes; With S7 block Privacy","Firmware version":"V3.3","Isochronous mode":"No","Of Which Central":"124","Outputs, default":"128 byte","Power loss, typ.":"4.2 W","Rated value (DC)":"24 V","S7 communication":"Yes; Only server, configured on one side","PROFIBUS DP slave":"No","Address area, max.":"32","Forcing, variables":"Inputs, outputs","Inputs, adjustable":"2 048 byte","PROFIBUS DP master":"Yes","Per Priority Class":"16","Retentivity preset":"Yes","Usable For Routing":"4; As slave only with active interface, with IM 151-7 CPU as DP master","Configuration rules":"max. 63 peripheral modules per station; station width < 1 m or < 2 m; max. 10 A per load group (power module); master interface module on right next to IM 151-7 CPU (X2 interface)","Data record routing":"Yes; With DP master module","Interfaces/bus type":"1 x MPI/PROFIBUS DP","Number/Number range":"0","Outputs, adjustable":"2 048 byte","PG/OP communication":"Yes","Plug-in (MMC), max.":"8 Mbyte","Programming package":"as of STEP 7 V5.5 + SP1 or as of V5.2 + SP1 + HSP 219 or as of STEP 7 TIA Portal V11","Diagnostics function":"Yes","Group error SF (red)":"Yes","HW functional status":"01","Inrush current, typ.":"1.8 A","Isolation tested with":"500 V DC","Number of breakpoints":"4","Number of startup OBs":"1; OB 100","Retentivity available":"Yes; MB 0 to MB 255","Retentivity adjustable":"Yes; via non-retain property on DB","S7 basic communication":"Yes; I blocks only","System functions (SFC)":"see instruction list","Deviation per day, max.":"10 s; Typ.: 2 s","IP degree of protection":"IP20","Number of entries, max.":"500","Status/control variable":"Yes","Transmission rate, max.":"12 Mbit/s","User data per job, max.":"See online help of STEP 7 (shared parameters of the SFBs/FBs and of the SFCs/FCs of S7 Communication)","For Bit Operations, Typ.":"0.06 µs","Number of DPV1 alarm OBs":"3; OB 55, 56, 57","Number of GD loops, max.":"8","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 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. 2048 bytes per block","Size of GD packets, max.":"22 byte","For Word Operations, Typ.":"0.12 µs","Global data communication":"No","Number of DP slaves, max.":"32; Per station","Number of delay alarm OBs":"2; OB 20, 21","Number of variables, max.":"10","Point-to-point connection":"No","Automatic Baud Rate Search":"Yes; only with passive interface","Hardware clock (real-time)":"Yes","Number of GD packets, max.":"8","Number of process alarm OBs":"1; OB 40","Process diagnostic messages":"Yes; ALARM_S, ALARM_SC, ALARM_SQ, ALARM_D, ALARM_DQ","Reverse polarity protection":"Yes; against destruction","S7 communication, as client":"No","S7 communication, as server":"Yes","usable for OP communication":"11","usable for PG communication":"11","Retentive And Synchronizable":"Yes","System function blocks (SFB)":"see instruction list","Length of mounting rail, max.":"Station width: ≤ 1 m or < 2 m","additional within an error OB":"4","from supply voltage 1L+, max.":"320 mA; 410 mA with DP master module","reserved for OP communication":"1","reserved for PG communication":"1","Cycle Monitoring Time / Preset":"150 ms","Number of cyclic interrupt OBs":"4; OB 32, 33, 34, 35","Number of synchronous error OBs":"2; OB 121, 122","Of Which Status Variables, Max.":"30","For Fixed Point Arithmetic, Typ.":"0.16 µs","Number of asynchronous error OBs":"6; OB 80, 82, 83 (for centralized I/O only, not for distributed I/O), 85, 86, 87","Of Which Control Variables, Max.":"14","User data per address area, max.":"32 byte; Up to max. size of the transfer memory","for backplane bus (5 V DC), max.":"700 mA","usable for S7 basic communication":"10","Number of modules per system, max.":"63; Centralized","For Floating Point Arithmetic, Typ.":"0.59 µs","permissible range, lower limit (DC)":"19.2 V","permissible range, upper limit (DC)":"28.8 V","reserved for S7 basic communication":"0","Activation/deactivation of DP slaves":"Yes","Number of GD packets, receiver, max.":"8","Output current of the interface, max.":"No","adjustable for OP communication, max.":"11","adjustable for OP communication, min.":"1","adjustable for PG communication, max.":"11","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":"Clock continues running after POWER OFF","Mains/voltage failure stored energy time":"5 ms","Monitoring 24 V voltage supply ON (green)":"Yes","Number of mounting rails that can be used":"1","simultaneously active Alarm-S blocks, max.":"300","User program protection/password protection":"Yes","adjustable for S7 basic communication, max.":"10","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.":"See online help of STEP 7 (shared parameters of the SFBs/FBs and of the SFCs/FCs of S7 Communication)","Direct data exchange (slave-to-slave communication)":"Yes","Number of login stations for message functions, max.":"12; Depending on the configured connections for PG/OP and S7 basic communication","between PROFIBUS DP and all other circuit components":"Yes","Data management on MMC (after last programming), min.":"10 a","Behavior of the clock following expiry of backup period":"the clock continues at the time of day it had when power was switched off","Retentive data area (incl. timers, counters, flags), max.":"64 kbyte","External Protection For Power Supply Lines (Recommendation)":"2 A min.","Number of DP slaves that can be simultaneously activated/deactivated, max.":"8"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$762.00 – $1,464.00","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/599fb3d3d8592ec955b0ddbf0a810439.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=140628&mlfb=6ES7151-7AA21-0AB0"},"ai":{"faq":[{"question":"What is 6ES7151-7AA21-0AB0's listed cfc (Yes; Optional) on this component line?","answer":"CFC programming language is supported as an optional slot, along with SCL, GRAPH, and HiGraph."},{"question":"What is 6ES7151-7AA21-0AB0's listed fbd (Yes) on this component line?","answer":"FBD programming language is supported."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7151-7AA21-0AB0","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/6ES7151-7AA21-0AB0 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}}