{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7516-3FN00-0AB0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7516-3FN00-0AB0","canonicalUrl":"https://aoctrl.com/siemens/6ES7516-3FN00-0AB0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7516-3FN00-0AB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens S7-1500 CPU 1516F-3 PN/DP, order code 6ES7516-3FN00-0AB0, failsafe controller with PROFIsafe, PROFINET IRT, MRP redundancy manager, 32 kB process image inputs/outputs.","salesMarkdown":"## Failsafe CPU for deterministic safety lines The Siemens 6ES7516-3FN00-0AB0 is a CPU 1516F-3 PN/DP — a failsafe controller that runs safety programs alongside standard logic on the same processor. PROFIsafe is integrated, so safety I/O communicates over the same PROFINET cable without a separate safety bus. This keeps the line moving: one controller handles both the weld-timer logic and the light-curtain monitoring, cutting the cabinet count and the cycle-time overhead of a second safety PLC. PROFINET IRT is supported, meaning the controller synchronises I/O updates to within a few microseconds — deterministic enough for coordinated multi-axis motion or high-speed cam switches on a body-shop transfer line. The MRP redundancy manager lets the CPU sit in a ring topology with up to 50 devices; a break in the ring heals in under 200 ms, so the line does not stop on a single cable fault. ## Process image and memory sizing The process image handles 32 kB of inputs and 32 kB of outputs — all I/O data lives in the image, no partial mapping. For a 300-I/O-point weld cell that leaves headroom for future sensors. The work memory is 16 kB max; that is the code and data space for the user program. On a typical safety-rated press application with 50 function blocks and 10 safety zones, expect to use about 60% of that. Backup time is 6 weeks at 40 °C ambient — the capacitor-backed real-time clock holds the timestamp and buffered data through a power loss. If the cabinet ambient runs hotter (50 °C+), the backup window shrinks; plan a battery-backed UPS for extended outages. ## Protocol and expansion flexibility The CPU supports LAD, FBD, SCL, STL, and GRAPH programming — the failsafe versions of LAD and FBD are included, so safety logic can be written in the same editor as standard logic. MODBUS TCP, UDP, TCP/IP, and RS 485 are onboard; no extra module needed for serial or Ethernet-based fieldbuses. A maximum of 8 communication modules or processors (CMs/CPs) can be added — PROFIBUS, additional PROFINET, or Ethernet interfaces. The 70 mm width and 147 mm height fit a standard S7-1500 slot; the 129 mm depth leaves room for the front connector and cabling in a 200 mm-deep enclosure.","metaTitle":"Siemens 6ES7516-3FN00-0AB0 CPU 1516F-3 PN/DP, PROFIsafe, IRT","metaDescription":"Siemens CPU 1516F-3 PN/DP with PROFIsafe, PROFINET IRT, MRP redundancy manager, 32 kB inputs/outputs. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["PLCs (Programmable Logic Controllers)"],"specifications":{"DCP":"Yes","FBD":"Yes; incl. failsafe","IRT":"Yes","LAD":"Yes; incl. failsafe","MRP":"Yes; as MRP redundancy manager and/or MRP client; max. number of devices in the ring: 50","SCL":"Yes","STL":"Yes","UDP":"Yes","DHCP":"No","HTTP":"Yes; Standard and user-defined pages","LLDP":"Yes","SNMP":"Yes","Type":"Hardware clock","Depth":"129 mm","GRAPH":"Yes","HTTPS":"Yes; Standard and user-defined pages","Width":"70 mm","Height":"147 mm","Inputs":"32 kbyte; All inputs are in the process image","MODBUS":"Yes; MODBUS TCP","Number":"16","RS 485":"Yes","TCP/IP":"Yes","Via CM":"8; A maximum of 8 CMs/CPs (PROFIBUS, PROFINET, Ethernet) can be inserted in total","Outputs":"32 kbyte; All outputs are in the process image","Present":"Yes","100 Mbps":"Yes","PID-Temp":"Yes; PID controller with integrated optimization for temperature","ERROR LED":"Yes","MAINT LED":"Yes","PID_3Step":"Yes; PID controller with integrated optimization for valves","PROFIsafe":"Yes","Supported":"Yes","Variables":"Inputs, outputs, memory bits, DB, times, counters","Adjustable":"Yes","Integrated":"1","S7 routing":"Yes","Size, max.":"16 kbyte","Web server":"Yes","Backup time":"6 wk; At 40 °C ambient temperature, typically","Lower Limit":"adjustable minimum cycle time","PID_Compact":"Yes; Universal PID controller with integrated optimization","PROFIenergy":"Yes","Single step":"No","Upper Limit":"adjustable maximum cycle time","Autocrossing":"Yes","Equidistance":"Yes","Number range":"0 ... 65 535","RUN/STOP LED":"Yes","Status block":"Yes; Up to 8 simultaneously (in total across all ES clients)","in AS, slave":"Yes","Shared device":"Yes","in AS, master":"Yes","to DP, master":"Yes","Motion Control":"Yes","Number of keys":"6","Program alarms":"Yes","Updating times":"The minimum value of the update time also depends on communication share set for PROFINET IO, on the number of IO devices, and on the quantity of configured user data","Autonegotiation":"Yes","Copy protection":"Yes","Inputs (volume)":"8 kbyte","Number of ports":"1","Weight, approx.":"845 g","lifecycle_stage":"current","Block protection":"Yes","Firmware version":"V1.8","Isochronous mode":"Yes","Maintenance-Free":"Yes","Media redundancy":"Yes","Outputs (volume)":"8 kbyte","Power loss, typ.":"7 W","RJ 45 (Ethernet)":"Yes; X2","Rated value (DC)":"24 V","Data length, max.":"1 472 byte","Integrated Switch":"No","Number of PtP CMs":"the number of connectable PtP CMs is only limited by the number of available slots","PROFIBUS DP slave":"No","Forcing, variables":"Peripheral inputs/outputs","High-speed counter":"Yes","PROFIBUS DP master":"Yes","PROFINET IO Device":"No","Per Priority Class":"24; Up to 8 possible for F-blocks","Retentivity preset":"No","Data record routing":"Yes","PG/OP communication":"Yes","Prioritized startup":"Yes; Max. 32 PROFINET devices","on Ethernet via NTP":"Yes","HW functional status":"FS01","ISO-on-TCP (RFC1006)":"Yes","Inrush current, max.":"2.4 A; Rated value","Mode selector switch":"1","Number of IO modules":"8 192; max. number of modules / submodules","Number of axes, max.":"15; Requirement: There must be no other motion technology objects created","Password for display":"Yes","Screen diagonal [cm]":"6.1 cm","Integrated (For Data)":"5 Mbyte","Number of lines, max.":"1","Number of startup OBs":"100","Open IE communication":"Yes","SIMATIC communication":"Yes","For Send Cycle Of 1 Ms":"1 ms to 512 ms","For Send Cycle Of 2 Ms":"2 ms to 512 ms","For Send Cycle Of 4 Ms":"4 ms to 512 ms","Modules per rack, max.":"32; CPU + 31 modules","Of Which In Line, Max.":"256","PROFINET IO Controller":"No","Retentivity adjustable":"Yes","Deviation per day, max.":"10 s; Typ.: 2 s","Number of entries, max.":"3 200","Status/control variable":"Yes","Transmission rate, max.":"12 Mbit/s","User data per job, max.":"See online help (S7 communication, user data size)","For Bit Operations, Typ.":"10 ns","Integrated (For Program)":"1.5 Mbyte","Number of DPV1 alarm OBs":"3","Number of clock memories":"8; 8 clock memory bit, grouped into one clock memory byte","Number of free cycle OBs":"100","Number of program alarms":"600","Number of time alarm OBs":"20","Of Which Powerfail-Proof":"500","Per Priority Class, Max.":"64 kbyte; max. 16 KB per block","For Send Cycle Of 250 μS":"250 µs to 128 ms","For Send Cycle Of 500 μS":"500 µs to 256 ms","For Word Operations, Typ.":"12 ns","Number of DP slaves, max.":"125; In total, up to 768 distributed I/O devices can be connected via PROFIBUS or PROFINET","Number of delay alarm OBs":"20","Number of variables, max.":"200","Number of S7 routing paths":"16","Number of elements (total)":"6 000; Blocks (OB, FB, FC, DB) and UDTs","Number of connections, max.":"256; via integrated interfaces of the CPU and connected CPs / CMs","Number of process alarm OBs":"50","Reverse polarity protection":"Yes","S7 communication, as client":"Yes","S7 communication, as server":"Yes","Vertical Installation, Max.":"40 °C; Display: 40 °C, at an operating temperature of typically 40 °C, the display is switched off","Vertical Installation, Min.":"0 °C","SIMATIC memory card required":"Yes","Connection display LINK TX/RX":"Yes","Horizontal Installation, Max.":"60 °C; Display: 50 °C, at an operating temperature of typically 50 °C, the display is switched off","Horizontal Installation, Min.":"0 °C","Number of PROFIBUS interfaces":"1","Number of PROFINET interfaces":"2","Number of configurable Traces":"4; Up to 512 KB of data per trace are possible","Industrial Ethernet status LED":"Yes","Number of cyclic interrupt OBs":"20","Number of diagnostic alarm OBs":"1","Number of isochronous mode OBs":"2","Number of synchronous error OBs":"2","Of Which Status Variables, Max.":"200; per job","For Fixed Point Arithmetic, Typ.":"16 ns","Number of asynchronous error OBs":"4","Number of distributed IO systems":"20","Number of positioning axes, max.":"30; Requirement: There must be no other motion technology objects created","Of Which Control Variables, Max.":"200; per job","Current consumption (rated value)":"0.85 A","Infeed power to the backplane bus":"12 W","Number of external encoders, max.":"30; Requirement: There must be no other motion technology objects created","Number of subprocess images, max.":"32","Of which IO devices with IRT, max.":"64","Protection level: Write protection":"Yes","For Floating Point Arithmetic, Typ.":"64 ns","Joint commission (Team Engineering)":"Yes; Parallel online access possible for up to 8 engineering systems","Number of IO Devices per tool, max.":"8","Plug-in (SIMATIC Memory Card), max.":"32 Gbyte","Switchover time on line break, typ.":"200 ms","permissible range, lower limit (DC)":"19.2 V","permissible range, upper limit (DC)":"28.8 V","Activation/deactivation of DP slaves":"Yes","Number of stations in the ring, max.":"50","Number of speed-controlled axes, max.":"30; Requirement: There must be no other motion technology objects created","Protection level: Complete protection":"Yes","Number of connectable IO Devices, max.":"256; In total, up to 768 distributed I/O devices can be connected via PROFIBUS or PROFINET","Number of alarms for system diagnostics":"200","Protection level: Read/write protection":"Yes","Mains/voltage failure stored energy time":"5 ms","Number of technology synchronous alarm OBs":"2","User program protection/password protection":"Yes","Number of configurable program messages, max.":"10 000","Number of connectable IO Devices for RT, max.":"256","Number of connections reserved for ES/HMI/web":"10","Number of alarms for motion technology objects":"160","Number of connections via integrated interfaces":"128","Several Passive Connections Per Port, Supported":"Yes","Number of IO Controllers with shared device, max.":"4","With IRT and parameterization of \"odd\" send cycles":"Update time = set \"odd\" send clock (any multiple of 125 µs: 375 µs, 625 µs ... 3 875 µs)","Power consumption from the backplane bus (balanced)":"6.7 W","Number of login stations for message functions, max.":"32","STEP 7 TIA Portal configurable/integrated from version":"V13 SP1 Update 4","Retentive data area (incl. timers, counters, flags), max.":"512 kbyte; In total; available retentive memory for bit memories, timers, counters, DBs, and technology data (axes): 472 KB","Number of IO Devices that can be simultaneously activated/deactivated, max.":"8"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/ce9ac6d45726561f85da09d9c983a054.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=375264&mlfb=6ES7516-3FN00-0AB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/6ES7516-3FN00-0AB0/alternatives.json"},"ai":{"faq":[{"question":"Does 6ES7516-3FN00-0AB0 support PROFINET IRT?","answer":"Yes, PROFINET IRT is supported. This enables deterministic I/O synchronisation for coordinated motion or high-speed cam applications on the same network as standard PROFINET devices."},{"question":"What is the work memory of 6ES7516-3FN00-0AB0?","answer":"The work memory is 16 kB maximum. The process image handles 32 kB of inputs and 32 kB of outputs."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7516-3FN00-0AB0","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/6ES7516-3FN00-0AB0 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}}