{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7318-2AJ00-0AB0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7318-2AJ00-0AB0","canonicalUrl":"https://aoctrl.com/siemens/6ES7318-2AJ00-0AB0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7318-2AJ00-0AB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC S7-300 CPU 318-2 DP, order code 6ES7318-2AJ00-0AB0, FM 16, 64 kbyte work memory, RS 485 interface, STEP 7 V5.0.","salesMarkdown":"## CPU 318-2 DP — FM 16 and 64 KB Work Memory The Siemens 6ES7318-2AJ00-0AB0 is a CPU 318-2 DP from the SIMATIC S7-300 family, built around the SFB type with FM 16 (function module 16) — the FM rating tells you this CPU is designed for high-speed closed-loop control and motion tasks, not just basic logic. It carries 64 kbyte of work memory, enough for mid-complexity applications like packaging machine sequences or multi-axis coordination. The CPU supports LAD, FBD, STL, SCL, and CFC programming languages. CFC support lets you wire up function blocks graphically. No MPI port on this unit, but the RS 485 interface serves as the PROFIBUS DP master connection. ## Fieldbus and Integration Constraints The RS 485 port is the primary fieldbus interface — this CPU speaks PROFIBUS DP natively as a master. For additional PROFIBUS or PROFINET connections, it supports up to four CP 342-5 communications processors, which gives you up to 16 PROFIBUS connections total. Point-to-point links via CP 342-5 PtP modules are limited to eight. The I/O address space is 244 bytes each for inputs and outputs — that's the maximum process-image size, not the total fieldbus data. If your application needs more than 244 bytes per direction, you'll need to use direct peripheral access (PIO) or distribute the load across multiple CPs. The overall rack count is 4, so the expansion chassis limit is tight for large distributed systems. ## Programming and Engineering Toolchain This CPU requires STEP 7 V5.0 or later. The GSD file for PROFIBUS DP integration is siem807f.gsg. Forcing of I/O and memory variables is supported, and routing across subnets is enabled. The retentive memory area is adjustable and covers inputs, outputs, memory bits, data blocks, timers, and counters. The time-of-day clock has a granularity of 1 hour with a lower limit of 1 ms — adequate for time-stamped alarms but not for high-resolution event logging.","metaTitle":"Siemens 6ES7318-2AJ00-0AB0 CPU 318-2 DP, FM 16","metaDescription":"Siemens 6ES7318-2AJ00-0AB0 CPU 318-2 DP with FM 16, 64 KB work memory, RS 485, STEP 7 V5.0. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["PLCs (Programmable Logic Controllers)"],"specifications":{"FM":"16","CFC":"Yes","FBD":"Yes","I2t":"0.4 A²·s","LAD":"Yes","MPI":"No","SCL":"Yes","STL":"Yes","Type":"SFB","Depth":"130 mm","Width":"160 mm","Height":"125 mm","Inputs":"244 byte","Number":"8","Preset":"150 ms","RS 485":"Yes","STEP 7":"Yes; V5.0","via CP":"4; CP 342-5","CP, LAN":"16","CP, PtP":"8","Forcing":"Yes","Outputs":"244 byte","Overall":"32","Present":"Yes","Routing":"Yes","GSD file":"siem807f.gsg","Isolated":"Yes","As Server":"Yes","HiGraph®":"Yes","Retentive":"Yes","Supported":"Yes; via CP and loadable FC","Variables":"Inputs, outputs, memory bits, DB, times, counters","Adjustable":"Yes","Integrated":"2","Size, max.":"64 kbyte","Command set":"see instruction list","Description":"see instruction list","Granularity":"1 h","Lower Limit":"1 ms","Racks, max.":"4","SYNC/FREEZE":"Yes","Single step":"Yes","Upper Limit":"6 000 ms","Equidistance":"Yes","Inputs, max.":"244 byte","Number, max.":"1 024 byte","Status block":"Yes","With Battery":"Yes; all blocks","in AS, slave":"Yes","Outputs, max.":"244 byte","in AS, master":"Yes","to MPI, slave":"Yes","Interface type":"Integrated RS 485 interface","Nesting levels":"8","expandable RAM":"Yes","to MPI, master":"Yes","Inputs, default":"256 byte","Range of values":"0 to 32767 hours","Weight, approx.":"930 g","Without Battery":"Yes; 11 KB","lifecycle_stage":"eol_hot","Adjustable, Max.":"8 192 byte","Firmware version":"V3.0","Of Which Central":"128","Outputs, default":"256 byte","Power loss, typ.":"12 W","Rated value (DC)":"24 V","S7 communication":"Yes","PROFIBUS DP slave":"Yes","expandable FEPROM":"Yes","Forcing, variables":"Inputs, outputs, bit memories, peripheral inputs, peripheral outputs","PROFIBUS DP master":"Yes","Per Priority Class":"16","Retentivity preset":"MB 0 to MB 15","Number/Number range":"0 to 7","PG/OP communication":"Yes","Process diagnostics":"Yes","Programming package":"STEP 7 V5.1 SP2","Software controller":"Yes","HW functional status":"03","Inrush current, typ.":"8 A","expandable RAM, max.":"2 Mbyte","integrated RAM, max.":"64 kbyte","Number of breakpoints":"4","Number of connections":"12","Number of nodes, max.":"32","Number of startup OBs":"1; OB 100","Retentivity available":"Yes; MB 0 to MB 1 023","Modules per rack, max.":"8","S7 basic communication":"No","System functions (SFC)":"see instruction list","Deviation per day, max.":"10 s","Number of entries, max.":"100","Status/control variable":"Yes","Transmission rate, max.":"12 Mbit/s","User data per job, max.":"160 byte","expandable FEPROM, max.":"4 Mbyte","For Bit Operations, Max.":"0.1 µs","For Bit Operations, Typ.":"0.1 µs","Number of clock memories":"8; 1 memory byte","Number of time alarm OBs":"2; OB 10, 11","Per Priority Class, Max.":"8 192 byte","Size of GD packets, max.":"54 byte","For Word Operations, Typ.":"0.1 µs","Global data communication":"No","Number of DP slaves, max.":"125","Number of delay alarm OBs":"2; OB 20, 21","Number of variables, max.":"256","Point-to-point connection":"No","Hardware clock (real-time)":"Yes","Number of connections, max.":"16","Number of process alarm OBs":"2; OB 40, 41","Process diagnostic messages":"Yes","S7 communication, as client":"No","S7 communication, as server":"Yes","usable for OP communication":"31","usable for PG communication":"31","usable for S7 communication":"30","Retentive And Synchronizable":"Yes","System function blocks (SFB)":"see instruction list","additional within an error OB":"3","reserved for OP communication":"1","reserved for PG communication":"1","Number of cyclic interrupt OBs":"2; OB 32, 35","Number of expansion units, max.":"3","Number of synchronous error OBs":"2; OB 121, 122","For Fixed Point Arithmetic, Typ.":"0.1 µs","Number of asynchronous error OBs":"5; OB 80, 81, 85, 86, 87","usable for S7 basic communication":"30","For Timer/Counter Operations, Typ.":"0.1 µs","For Floating Point Arithmetic, Typ.":"0.6 µs","permissible range, lower limit (DC)":"20.4 V","permissible range, upper limit (DC)":"28.8 V","Activation/deactivation of DP slaves":"Yes","Number of GD packets, receiver, max.":"2","Number of GD packets, transmitter, max.":"1","simultaneously active Alarm-S blocks, max.":"100","User program protection/password protection":"Yes","Size of GD packet (of which consistent), max.":"32 byte","User data per job (of which consistent), max.":"76 byte","Power supply to interface (15 to 30 V DC), max.":"200 mA","Current consumption (in no-load operation), typ.":"1.2 A","Direct data exchange (slave-to-slave communication)":"Yes; Transmitter and receiver","External Protection For Power Supply Lines (Recommendation)":"Miniature circuit breaker; 2 A, type B or C"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$211.11","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=214641&mlfb=6ES7318-2AJ00-0AB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/6ES7318-2AJ00-0AB0/alternatives.json"},"ai":{"faq":[{"question":"What is the memory size of 6ES7318-2AJ00-0AB0?","answer":"The work memory is 64 kbyte. The retentive memory area is adjustable and covers inputs, outputs, memory bits, data blocks, timers, and counters."},{"question":"How can I order 6ES7318-2AJ00-0AB0?","answer":"This CPU is sourced to order against your RFQ. Availability and pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7318-2AJ00-0AB0","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/6ES7318-2AJ00-0AB0 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}}