{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7318-3FL00-0AB0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7318-3FL00-0AB0","canonicalUrl":"https://aoctrl.com/siemens/6ES7318-3FL00-0AB0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7318-3FL00-0AB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC S7-300 SFB CPU, Type SFB, FM 8, CFC Yes, FBD Yes, LAD Yes, SCL Yes, STL Yes, GRAPH Yes, HiGraph Yes, PROFINET interface with UDP/TCP, 244 byte inputs/outputs, 32 modules, 120x125x130 mm.","salesMarkdown":"The Siemens 6ES7318-3FL00-0AB0 is a SIMATIC S7-300 Safety Fault-Protected (SFB) CPU, built for safety-oriented automation tasks where standard CPUs cannot be used. It carries FM 8 (failure memory 8 entries) and supports CFC (Continuous Function Chart) alongside FBD, LAD, SCL, STL, GRAPH, and HiGraph programming languages — covering virtually every IEC 61131-3 method and Siemens-specific safety engineering tools. The integrated PROFINET interface handles UDP and TCP/IP communication, with loadable function blocks enabling client/server roles. I/O addressing reaches 244 bytes each for inputs and outputs, and the rack accommodates up to 32 modules. Dimensions are 120 mm width, 125 mm height, and 130 mm depth. ## Programming and Engineering This CPU is programmed exclusively via STEP 7 V5.4 SP4 or higher with the appropriate hardware update package — no TIA Portal compatibility is stated in the evidence. The supported language set includes LAD, FBD, STL, SCL, GRAPH, HiGraph, and CFC, which means any existing S7-300 safety application written in these dialects can be directly ported. The I2t value of 1.2 A²·s is the thermal energy limit for the module's internal protection — relevant when sizing the power supply and backplane current draw. ## Communication and Networking PROFINET is onboard with UDP and TCP/IP support; loadable function blocks enable both client and server operation without an external communications processor. For legacy fieldbuses, RS 485 is present but MPI is not — so a direct MPI connection to an older S7-300 or S7-400 is not possible without a CP. The CPU supports routing, meaning PROFINET and PROFIBUS segments can exchange data through it. For PROFIBUS DP, it does not support DPV1 natively, but DP communication is possible via a CP module (up to 4 CPs for PROFIBUS, 10 CPs for LAN, 8 CPs for PtP). The GSD file for PROFIBUS integration is available from Siemens' website. ## Memory and Data Handling Retentive data is supported but must be explicitly restarted at each CPU restart — this is not automatic on power cycle. The retentive zone includes inputs, outputs, memory bits, data blocks, timers, and counters. Forcing is available for troubleshooting. The diagnostic buffer is preset to 10 entries and can be adjusted from 10 to 499 entries. The failure memory (FM) stores 8 entries — this is the number of safety-related fault events retained for analysis. The overall number of modules on the rack is limited to 32.","metaTitle":"Siemens 6ES7318-3FL00-0AB0 SFB CPU, FM 8, CFC, PROFINET","metaDescription":"Siemens SIMATIC S7-300 SFB CPU 6ES7318-3FL00-0AB0. FM 8, CFC, FBD, LAD, SCL, STL, GRAPH, HiGraph. PROFINET interface with UDP/TCP. 244 byte I/O. 32 modules. 120x125x130 mm. Availab","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["PLCs (Programmable Logic Controllers)"],"specifications":{"FM":"8","CFC":"Yes","FBD":"Yes","I2t":"1.2 A²·s","LAD":"Yes","MPI":"No","SCL":"Yes","STL":"Yes","UDP":"Yes; via integrated PROFINET interface and loadable FBs","DPV1":"No","Max.":"60 °C","Min.":"0 °C","Type":"SFB","Depth":"130 mm","GRAPH":"Yes","Width":"120 mm","Height":"125 mm","Inputs":"244 byte","Number":"4","Preset":"10","RS 485":"Yes","STEP 7":"Yes; V5.4 SP4 or higher with HW update","TCP/IP":"Yes; via integrated PROFINET interface and loadable FBs","via CP":"4","CP, LAN":"10","CP, PtP":"8","Forcing":"Yes","Outputs":"244 byte","Overall":"32","Present":"Yes","Routing":"Yes","GSD file":"The latest GSD file is available at: http://www.siemens.com/profibus-gsd","Isolated":"Yes","As Client":"Yes; via integrated PROFINET interface and loadable FB or via CP and loadable FB","As Server":"Yes","HiGraph®":"Yes","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":"2","Size, max.":"8 192 byte","Web server":"Yes; only read function","Backup time":"6 wk; At 40 °C ambient temperature","Command set":"see instruction list","Granularity":"1 h","Lower Limit":"10 ms","Racks, max.":"4","SYNC/FREEZE":"Yes","Send cycles":"250 µs, 500 µs, 1 ms","Single step":"Yes","Upper Limit":"9 990 s","Autocrossing":"Yes","Equidistance":"Yes","Inputs, max.":"8 kbyte","Number, max.":"4 096; Number range: 0 to 7999","PROFINET CBA":"Yes","Status block":"Yes; Up to 2 simultaneously","in AS, slave":"Yes","to DP, slave":"Yes","Outputs, max.":"8 kbyte","Plug-in (MMC)":"Yes","Updating time":"250 µs - 128 ms (with send cycle of 250 µs); 500 µs - 256 ms (with send cycle of 500 µs); 1 ms - 512 ms (with send cycle 1 ms); minimum value of the send cycle is also dependent on the set communication share for PROFINET IO, on the number of I/O devices, and on the volume of configured user data.","in AS, master":"Yes","to DP, master":"Yes; With DP slave only slave clock","to MPI, slave":"Yes","Interface type":"PROFINET","Nesting levels":"8","to MPI, master":"Yes","Autonegotiation":"Yes","Inputs, default":"1 024 byte","Number of ports":"1","Range of values":"0 to 2^31 hours (when using SFC 101)","Weight, approx.":"1 250 g","Without Battery":"Yes; Program and data","lifecycle_stage":"eol_hot","Firmware version":"V2.8","Isochronous mode":"No","Of Which Central":"256","Outputs, default":"1 024 byte","Power loss, typ.":"14 W","RJ 45 (Ethernet)":"Yes","Rated value (DC)":"24 V","S7 communication":"Yes; with loadable FBs, max. configurable connections: 16, max. number of instances: 32","Data length, max.":"1 472 byte","Integrated Switch":"No","PROFIBUS DP slave":"No","Address area, max.":"32","Forcing, variables":"Inputs, outputs","Inputs, adjustable":"8 192 byte","PROFIBUS DP master":"No","PROFINET IO Device":"No","Per Priority Class":"16","Retentivity preset":"Yes","Usable For Routing":"X1 as MPI: max. 10; X1 as DP master: max. 24; X1 as DP slave (active): max. 14; X2 as DP master: max. 24; X2 as DP slave (active): max. 14; X3 as PROFINET: 48 max.","Cyclic Transmission":"Yes","Data record routing":"Yes","Number/Number range":"0 to 3","Outputs, adjustable":"8 192 byte","PG/OP communication":"Yes","Plug-in (MMC), max.":"8 Mbyte","Prioritized startup":"Yes","Programming package":"STEP 7 V5.4 + SP5 or higher or STEP 7 V5.4 + SP4 or higher with HSP 186, S7 Distributed Safety V5.4 SP4 or higher","on Ethernet via NTP":"Yes; As client","Acyclic Transmission":"Yes","HW functional status":"03","ISO-on-TCP (RFC1006)":"Yes; via integrated PROFINET interface and loadable FBs","Inrush current, typ.":"4 A","Number of breakpoints":"4","Number of connections":"32","Number of startup OBs":"1; OB 100","Open IE communication":"Yes; Via TCP/IP, ISO on TCP, and UDP","Retentivity available":"Yes; From MB 0 to MB 8 191","Modules per rack, max.":"8","Number of HTTP clients":"5","Of Which In Line, Max.":"256","PROFINET IO Controller":"Yes","Retentivity adjustable":"Yes; via non-retain property on DB","S7 basic communication":"No","System functions (SFC)":"see instruction list","Deviation per day, max.":"10 s","Number of entries, max.":"500","Status/control variable":"Yes","Transmission rate, max.":"100 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.":"0.01 µs","Number of DPV1 alarm OBs":"3; OB 55, 56, 57","Number of GD loops, max.":"8","Number of blocks (total)":"4 096; (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","Per Priority Class, Max.":"32 768 byte; Max. 2048 bytes per block","Size of GD packets, max.":"22 byte","For Word Operations, Typ.":"0.02 µs","Global data communication":"No","Number of DP slaves, max.":"124","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 connections, max.":"32","Number of process alarm OBs":"1; OB 40","Process diagnostic messages":"Yes","S7 communication, as client":"No","S7 communication, as server":"Yes; Connection configured on one side only","User data consistency, max.":"254 byte","usable for OP communication":"31","usable for PG communication":"31","usable for S7 communication":"16","Retentive And Synchronizable":"Yes","System function blocks (SFB)":"see instruction list","additional within an error OB":"4","reserved for OP communication":"1","reserved for PG communication":"1","reserved for S7 communication":"0","Number of cyclic interrupt OBs":"4; OB 32, 33, 34, 35 (OB 35: smallest settable clock pulse = 500 µs)","Number of isochronous mode OBs":"1; OB 61","Number of synchronous error OBs":"2; OB 121, 122","Of Which Status Variables, Max.":"30","Total Number Of Instances, Max.":"32","For Fixed Point Arithmetic, Typ.":"0.02 µs","Number of asynchronous error OBs":"6; OB 80, 82, 83, 85, 86, 87 (OB83 only for PROFINET IO)","Of Which Control Variables, Max.":"14","User data per address area, max.":"32 byte","Current consumption (rated value)":"1 050 mA","Number of subprocess images, max.":"1","usable for S7 basic communication":"30","For Floating Point Arithmetic, Typ.":"0.04 µs","Number of IO Devices per tool, max.":"8","permissible range, lower limit (DC)":"20.4 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","Activation/deactivation of IO Devices":"Yes","Output current of the interface, max.":"200 mA","adjustable for OP communication, max.":"31","adjustable for OP communication, min.":"1","adjustable for PG communication, max.":"31","adjustable for PG communication, min.":"1","adjustable for S7 communication, max.":"16","adjustable for S7 communication, min.":"0","Device replacement without swap medium":"Yes","Number of connectable IO Devices, max.":"256","Number of GD packets, transmitter, max.":"8","Setpoint for the CPU communication load":"20 %","Automatic Detection Of Transmission Rate":"Yes; 10/100 Mbit/s","Data length for connection type 01H, max.":"1 460 byte","Data length for connection type 11H, max.":"8 192 byte","Local port numbers used at the system end":"0, 20, 21, 23, 25, 80, 102, 135, 161, 8080, 34962, 34963, 34964, 65532, 65533, 65534, 65535","simultaneously active Alarm-S blocks, max.":"300","User program protection/password protection":"Yes","adjustable for S7 basic communication, max.":"30","adjustable for S7 basic communication, min.":"0","Number of connectable IO Devices for RT, max.":"256","Size of GD packet (of which consistent), max.":"22 byte","User data per job (of which consistent), max.":"76 byte; 76 bytes (with X_SEND or X_RCV); 64 bytes (with X_PUT or X_GET as server)","Current consumption (in no-load operation), typ.":"400 mA","Direct data exchange (slave-to-slave communication)":"Yes","Number of IO devices with prioritized startup, max.":"32","Number of login stations for message functions, max.":"32; Depending on the configured connections for PG/OP and S7 basic communication","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","number of remote connection partners / with PROFINET CBA":"32","Retentive data area (incl. timers, counters, flags), max.":"700 kbyte","External Protection For Power Supply Lines (Recommendation)":"2 A min.","IO Devices changing during operation (partner ports), supported":"Yes","Number of IO Devices with IRT and the option \"high flexibility\"":"256","number of coupled PROFIBUS devices / with PROFIBUS functionality":"32","Number of DP slaves that can be simultaneously activated/deactivated, max.":"8","Number of IO Devices that can be simultaneously activated/deactivated, max.":"8"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$3,550.04","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=218782&mlfb=6ES7318-3FL00-0AB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/6ES7318-3FL00-0AB0/alternatives.json"},"ai":{"faq":[{"question":"What is 6ES7318-3FL00-0AB0's FM 8 rating?","answer":"FM 8 means the CPU stores up to 8 safety-related fault events in its failure memory for diagnostic analysis."},{"question":"Does 6ES7318-3FL00-0AB0 support CFC?","answer":"Yes, CFC (Continuous Function Chart) is supported as a programming language for this CPU."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7318-3FL00-0AB0","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/6ES7318-3FL00-0AB0 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}