{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7288-1ST20-0AA1","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7288-1ST20-0AA1","canonicalUrl":"https://aoctrl.com/siemens/6ES7288-1ST20-0AA1","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7288-1ST20-0AA1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens S7-1200 CPU, 6ES7288-1ST20-0AA1, 12 KB program memory, 144-byte I/O, PROFINET, RS-485, PID, 8 high-speed counters.","salesMarkdown":"## I/O and memory capacity The 6ES7288-1ST20-0AA1: The CPU handles 144 bytes of inputs and 144 bytes of outputs, mapped as 256 bits of digital I/O plus 56 words of analog I/O per device. Program memory is 12 KB, with DDR RAM and flash for retention. Forcing is supported, which helps during commissioning when you need to override a sensor without rewiring. ## Communication and networking Built-in PROFINET interface with autocrossing and autonegotiation, minimum update time 4 ms. RS-485 port runs up to 187.5 kbps for Modbus or point-to-point links. PROFIBUS is available via a CM DP module. The CPU can act as both Modbus client and server. Ethernet TCP/IP is native. ## High-speed counters and PID Six single-phase high-speed counters: four at 200 kHz, two at 30 kHz. For A/B phase quadrature encoders: two at 100 kHz, two at 20 kHz. The PID controller handles continuous or binary outputs across up to 8 loops with auto/manual mode — enough for a small process skid or conveyor zone. Marked as current production. No successor or phase-out date has been published. CE marked; no UL or CSA listing appears in the record, so verify if your panel requires those marks.","metaTitle":"Siemens 6ES7288-1ST20-0AA1 S7-1200 CPU, 12 KB program memory","metaDescription":"Siemens 6ES7288-1ST20-0AA1 S7-1200 CPU with 12 KB program memory, 144-byte I/O, PROFINET, RS-485, PID control, 8 high-speed counters, -40 to 70 °C. Current production, sourced to o","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["DIN Rail Power Supplies"],"specifications":{"FBD":"Yes","LAD":"Yes","RAM":"Yes","STL":"Yes","Max.":"70 °C","Min.":"-40 °C","Type":"Hardware clock, no battery backup","Depth":"81 mm","Flash":"Yes","Width":"90 mm","title":"6ES7288-1ST20-0AA1","Height":"100 mm","Inputs":"144 byte; 256 bit of digital inputs & 56 words of analog inputs","RS 485":"Yes","TCP/IP":"Yes","CE mark":"Yes","Forcing":"Yes","Outputs":"144 byte; 256 bit of digital outputs & 56 words of analog outputs","Present":"Yes; Maintenance free, RTC requires 7 days.","Isolated":"Yes; Transformer isolated, 1,500V AC","PROFIBUS":"Yes; Via CM DP module","As Client":"Yes","As Server":"Yes","Supported":"Yes","Backup time":"7 d","Memory size":"12 kbyte; Program memory","description":"SIMATIC S7-200 SMART, CPU ST20, standard CPU, DC/DC/DC, onboard I/O: 12 DI 24 V DC; 8 DQ 24 V DC; power supply: DC 20.4 - 28.8 V DC, program/data memory 20 KB web server support","Autocrossing":"Yes","Inputs, max.":"128 byte; Per device","Outputs, max.":"128 byte; Per device","Rail mounting":"Yes; Standard - DIN rail","Updating time":"4 ms; The minimum value of the update time also depends on the communication component set for PROFINET IO, on the number of IO devices and the quantity of configured user data.","For Signal \"0\"":"I0.0 to I0.3 < 1 V DC; I0.4 to I2.7 < 5 V DC","For Signal \"1\"":"I0.0 to I0.3 > 4V; I0.4 to I2.7 > 15V","Interface type":"RS 485 (max. 187.5 kbps)","PID controller":"Yes; PID closed-loop control function: Continuous controller outputs, binary controller outputs, automatic/manual mode, max. 8 loops","Shielded, Max.":"500 m","Type of memory":"DDR","Autonegotiation":"Yes","Parameterizable":"Yes; 6 Single phase: 4 HSCs at 200 kHz; 2 HSCs at 30 kHz 4 A/B phase: 2 HSCs at 100 kHz; 2 HSCs at 20 kHz","Weight, approx.":"320 g","lifecycle_stage":"current","\"0\" To \"1\", Max.":"3 µs; of the standard outputs, max. 3 µs; of the pulse outputs, max. (Q a.0 to Q a.3) 1 µs","\"1\" To \"0\", Max.":"200 µs; of the standard outputs, max. 200 µs; of the pulse outputs, max. (Q a.0 to Q a.3) 50 µs","Power loss, max.":"20 W","RJ 45 (Ethernet)":"Yes","Rated value (DC)":"24 V","S7 communication":"Yes","Unshielded, Max.":"150 m","Fall height, max.":"0.3 m; five times, in product package","Micro Memory Card":"Yes; microSDHC Card (optional)","Source/sink input":"Yes","Number of counters":"6","On Lamp Load, Max.":"5 W","PROFINET IO Device":"Yes; I-Device since V2.5","up to 40 °C, max.":"12","At \"0\" To \"1\", Max.":"12.8 ms","At \"0\" To \"1\", Min.":"0.2 ms","Programming package":"STEP 7 Micro/WIN SMART","Current output, max.":"300 mA; 24 V DC Sensor Power","For Signal \"1\", Min.":"20 V DC","For Signal \"1\", Typ.":"4 mA","Inrush current, max.":"11.7 A; at 28.8 V","Type of input voltage":"DC","PROFINET IO Controller":"Yes; Since V2.4","Deviation per day, max.":"120 s; within 120s/month at 25 °C","Number of pulse outputs":"3","Number of relay outputs":"0","Status/control variable":"Yes","Storage/transport, max.":"1 080 hPa","Storage/transport, min.":"660 hPa","Transmission rate, max.":"100 Mbit/s","For Bit Operations, Typ.":"150 ns; / instruction","Number of digital inputs":"12","Current consumption, max.":"720 mA; 24 V DC","For Word Operations, Typ.":"1.2 µs; / instruction","Number of digital outputs":"8","With Resistive Load, Max.":"0.5 A","For Signal \"1\" Rated Value":"0.5 A","Hardware clock (real-time)":"Yes","Installation altitude, max.":"2 000 m","Installation altitude, min.":"-1 000 m","Number of RS 485 interfaces":"1","Of Which High-Speed Outputs":"3; 100 kHz Pulse Train Output","Vertical Installation, Max.":"50 °C","Vertical Installation, Min.":"0 °C","Horizontal Installation, Max.":"60 °C","Horizontal Installation, Min.":"0 °C","Test voltage at air discharge":"8 kV","Memory available for user data":"8 kbyte","for backplane bus (5 V DC), max.":"1.4 A; max. 5 V DC for EM bus","Supports protocol for PROFINET IO":"Yes; RT Controller (since FW V2.4) & I-Device (since FW V2.5)","Test voltage at contact discharge":"4 kV","For Floating Point Arithmetic, Typ.":"3.6 µs; / instruction","permissible range, lower limit (DC)":"20.4 V","permissible range, upper limit (DC)":"28.8 V","For Signal \"0\" Residual Current, Max.":"10 µA","Number of connectable IO Devices, max.":"8","Automatic Detection Of Transmission Rate":"Yes; 10/100 Mbit/s","Number of industrial Ethernet interfaces":"1","Limit class A, for use in industrial areas":"Yes; EN 61000-6-4, interference emission: Intended for use in industrial areas.","Operation at 25 °C without condensation, max.":"95 %","Of The Pulse Outputs, With Resistive Load, Max.":"100 kHz","Interference emission via line/AC current cables":"EN 61000-6-4, interference emission: Intended for use in industrial areas.","Of Which Inputs Usable For Technological Functions":"6; HSC (High Speed Counting)","For Signal \"0\", Max. (Permissible Quiescent Current)":"1 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$223.00","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/897d25653492eb616f461322ed0302b8.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1522368&mlfb=6ES7288-1ST20-0AA1"},"ai":{"faq":[{"question":"What are the key I/O specifications?","answer":"144 bytes each of inputs and outputs, mapped as 256 bits of digital I/O plus 56 words of analog I/O per device."},{"question":"What programming languages does it support?","answer":"LAD (ladder), FBD (function block diagram), and STL (statement list)."},{"question":"What communication interfaces are built in?","answer":"PROFINET with autocrossing, RS-485 up to 187.5 kbps, and Ethernet TCP/IP. PROFIBUS requires an optional CM DP module."},{"question":"What is the ambient temperature range?","answer":"-40 to 70 °C."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7288-1ST20-0AA1","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/6ES7288-1ST20-0AA1 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}}