General information
Product type designation	CPU 1516-3 PN/DP
HW functional status	FS04
Firmware version ● FW update possible	V4.0 Yes
Product function
● I&M data ● Isochronous mode ● SysLog	Yes; I&M0 to I&M3 Yes; Distributed and central; with minimum OB 6x cycle of 375 µs (distributed) and 1 ms (central) Yes
Engineering with
● STEP 7 TIA Portal configurable/integrated from version	V20 (FW V4.0) / V18 (FW V3.0) or higher; configurable with older TIA Portal versions as 6ES7516-3AN02-0AB0
Configuration control
via dataset	Yes
Display
Screen diagonal [cm]	6.1 cm
Control elements
Number of keys	8
Mode buttons	2
Supply voltage
Rated value (DC)	24 V
permissible range, lower limit (DC)	19.2 V
permissible range, upper limit (DC)	28.8 V
Reverse polarity protection	Yes
Mains buffering
● Mains/voltage failure stored energy time ● Repeat rate, min.	5ms 1/s
Input current
Current consumption (rated value)	0.69 A
Current consumption, max.	1.08 A
Inrush current, max.	1.15 A; Rated value
I²t	0.6 A²·s
Power
Infeed power to the backplane bus	12 W
Power consumption from the backplane bus (balanced)	6.7 W
Power loss
Power loss, typ.	4 W
Memory
Number of slots for SIMATIC memory card	1
SIMATIC memory card required	Yes
Work memory
● integrated (for program) ● integrated (for data)	2 Mbyte 7.5 Mbyte
Load memory
● Plug-in (SIMATIC Memory Card), max.	32 Gbyte
Backup
● maintenance-free	Yes
CPU processing times
for bit operations, typ.	6 ns
for word operations, typ.	7 ns
for fixed point arithmetic, typ.	9 ns
for floating point arithmetic, typ.	37 ns
CPU-blocks
Number of elements (total)	8 000; Blocks (OB, FB, FC, DB) and UDTs
DB
● Number range ● Size, max.	1 … 60 999; subdivided into: number range that can be used by the user: 1 … 59 999, and number range of DBs created via SFC 86: 60 000 … 60 999 7.5 Mbyte; For DBs with absolute addressing, the max. size is 64 KB
FB
● Number range ● Size, max.	0 … 65 535 1 Mbyte
FC
● Number range ● Size, max.	0 … 65 535 1 Mbyte
OB
● Size, max. ● Number of free cycle OBs ● Number of time alarm OBs ● Number of delay alarm OBs ● Number of cyclic interrupt OBs ● Number of process alarm OBs ● Number of DPV1 alarm OBs ● Number of isochronous mode OBs ● Number of technology synchronous alarm OBs ● Number of startup OBs ● Number of asynchronous error OBs ● Number of synchronous error OBs ● Number of diagnostic alarm OBs	1 Mbyte 100 20 20 20; With minimum OB 3x cycle of 250 µs 50 3 3 2 100 4 2 1
Nesting depth
● per priority class	24
Counters, timers and their retentivity
S7 counter
● Number	2048
Retentivity
— adjustable	Yes
IEC counter
● Number	Any (only limited by the main memory)
Retentivity
— adjustable	Yes
S7 times
● Number	2048
Retentivity
— adjustable	Yes
IEC timer
● Number	Any (only limited by the main memory)
Retentivity
— adjustable	Yes
Data areas and their retentivity
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
Extended retentive data area (incl. timers, counters, flags), max.	7.5 Mbyte; When using PS 6 0W 24/48/60 V DC HF
Flag
● Size, max. ● Number of clock memories	16 kbyte 8; 8 clock memory bit, grouped into one clock memory byte
Data blocks
● Retentivity adjustable ● Retentivity preset	Yes No
Local data
● per priority class, max.	64 kbyte; max. 16 KB per block
Address area
Number of IO modules	8 192; max. number of modules / submodules
I/O address area
● Inputs ● Outputs	32 kbyte; All inputs are in the process image 32 kbyte; All outputs are in the process image
per integrated IO subsystem
— Inputs (volume) — Outputs (volume)	8 kbyte 8 kbyte
per CM/CP
— Inputs (volume) — Outputs (volume)	8 kbyte 8 kbyte
Subprocess images
● Number of subprocess images, max.	32
Hardware configuration
Number of distributed IO systems	64; A distributed I/O system is characterized not only by the integration of distributed I/O via PROFINET or PROFIBUS communication modules, but also by the connection of I/O via AS-i master modules or links (e.g. IE/PB-Link)
Number of DP masters
● integrated ● Via CM	1 8; A maximum of 8 CMs/CPs (PROFIBUS, PROFINET, Ethernet) can be inserted in total
Number of IO Controllers
● integrated ● Via CM	2 8; A maximum of 8 CMs/CPs (PROFIBUS, PROFINET, Ethernet) can be inserted in total
Rack
● Modules per rack, max. ● Number of lines, max.	32; CPU + 31 modules 1
PtP CM
● Number of PtP CMs	the number of connectable PtP CMs is only limited by the number of available slots
Time of day
Clock
● Type ● Backup time ● Deviation per day, max.	Hardware clock 6 wk; At 40 °C ambient temperature, typically 10 s; Typ.: 2 s
Operating hours counter
● Number	16
Clock synchronization
● supported ● to DP, master ● on DP, device ● in AS, master ● in AS, device ● on Ethernet via NTP	Yes Yes Yes; via PROFIBUS CM / CP Yes Yes Yes
Interfaces
Number of PROFINET interfaces	2
Number of PROFIBUS interfaces	1
1. Interface
Interface types
● RJ 45 (Ethernet) ● Number of ports ● integrated switch	Yes;X1 2 Yes
Protocols
● IP protocol ● PROFINET IO Controller ● PROFINET IO Device ● SIMATIC communication ● Open IE communication ● Web server ● Media redundancy	Yes; IPv4 Yes Yes Yes Yes; Optionally also encrypted Yes Yes
PROFINET IO Controller
Services
— Isochronous mode — Direct data exchange — IRT — PROFIenergy — Prioritized startup — Number of connectable IO Devices, max. — Of which IO devices with IRT, max. — Number of connectable IO Devices for RT, max. — of which in line, max. — Number of IO Devices that can be simultaneously activated/deactivated, max. — Number of IO Devices per tool, max. — Updating times — PROFINET Security Class	Yes Yes; Requirement: IRT and isochronous mode (MRPD optional) Yes Yes; per user program Yes; Max. 32 PROFINET devices 256; in total, up to 1024 distributed I/O devices can be connected via AS-i, PROFIBUS or PROFINET 64 256 256 8; in total across all interfaces 8 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 1
Update time for IRT
— for send cycle of 250 µs — for send cycle of 500 µs — for send cycle of 1 ms — for send cycle of 2 ms — for send cycle of 4 ms — With IRT and parameterization of “odd” send cycles	250 μs to 4 ms; Note: In the case of IRT with isochronous mode, the minimum update time of 375 µs of the isochronous OB is decisive 500 µs to 8 ms 1 ms to 16 ms 2 ms to 32 ms 4 ms to 64 ms Update time = set “odd” send clock (any multiple of 125 µs: 375 µs, 625 µs … 3 875 µs)
Update time for RT
— for send cycle of 250 µs — for send cycle of 500 µs — for send cycle of 1 ms — for send cycle of 2 ms — for send cycle of 4 ms	250 µs to 128 ms 500 µs to 256 ms 1 ms to 512 ms 2 ms to 512 ms 4 ms to 512 ms
PROFINET IO Device
Services
— Isochronous mode — IRT — PROFIenergy — Shared device — Number of IO Controllers with shared device, max. — activation/deactivation of I-devices — Asset management record — PROFINET Security Class	No Yes Yes; per user program Yes 4 Yes; per user program Yes; per user program SNMP Configuration and DCP Read Only
2. Interface
Interface types
● RJ 45 (Ethernet) ● Number of ports ● integrated switch	Yes; X2 1 No
Protocols
● IP protocol ● PROFINET IO Controller ● PROFINET IO Device ● SIMATIC communication ● Open IE communication ● Web server ● Media redundancy	Yes; IPv4 Yes Yes Yes Yes; Optionally also encrypted Yes No
PROFINET IO Controller
Services
— Isochronous mode — Direct data exchange — IRT — PROFIenergy — Prioritized startup — Number of connectable IO Devices, max. — Number of connectable IO Devices for RT, max. — of which in line, max. — Number of IO Devices that can be simultaneously activated/deactivated, max. — Number of IO Devices per tool, max. — Updating times — PROFINET Security Class	No No No Yes; per user program No 32; in total, up to 1024 distributed I/O devices can be connected via AS-i, PROFIBUS or PROFINET 32 32 8; in total across all interfaces 8 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 1
Update time for IRT
— for send cycle of 250 µs — for send cycle of 500 µs — for send cycle of 1 ms — for send cycle of 2 ms — for send cycle of 4 ms — With IRT and parameterization of “odd” send cycles	250 μs to 4 ms; Note: In the case of IRT with isochronous mode, the minimum update time of 375 µs of the isochronous OB is decisive 500 µs to 8 ms 1 ms to 16 ms 2 ms to 32 ms 4 ms to 64 ms Update time = set “odd” send clock (any multiple of 125 µs: 375 µs, 625 µs … 3 875 µs)
Update time for RT
— for send cycle of 250 µs — for send cycle of 500 µs — for send cycle of 1 ms — for send cycle of 2 ms — for send cycle of 4 ms	250 µs to 128 ms 500 µs to 256 ms 1 ms to 512 ms 2 ms to 512 ms 4 ms to 512 ms
PROFINET IO Device
Services
— Isochronous mode — IRT — PROFIenergy — Shared device — Number of IO Controllers with shared device, max. — activation/deactivation of I-devices — Asset management record — PROFINET Security Class	No Yes Yes; per user program Yes 4 Yes; per user program Yes; per user program SNMP Configuration and DCP Read Only
Interface types
● RJ 45 (Ethernet) ● Number of ports ● integrated switch	Yes; X2 1 No
Protocols
● IP protocol ● PROFINET IO Controller ● PROFINET IO Device ● SIMATIC communication ● Open IE communication ● Web server ● Media redundancy	Yes; IPv4 Yes Yes Yes Yes; Optionally also encrypted Yes No
PROFINET IO Controller
Services
— Isochronous mode — Direct data exchange — IRT — PROFIenergy — Prioritized startup — Number of connectable IO Devices, max. — Number of connectable IO Devices for RT, max. — of which in line, max. — Number of IO Devices that can be simultaneously activated/deactivated, max. — Number of IO Devices per tool, max. — Updating times — PROFINET Security Class	No No No Yes; per user program No 32; in total, up to 1024 distributed I/O devices can be connected via AS-i, PROFIBUS or PROFINET 32 32 8; in total across all interfaces 8 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 1
Update time for RT
— for send cycle of 1 ms	1 ms to 512 ms
PROFINET IO Device
Services
— Isochronous mode — IRT — PROFIenergy — Prioritized startup — Shared device — Number of IO Controllers with shared device, max. — activation/deactivation of I-devices — Asset management record — PROFINET Security Class	No No Yes; per user program No Yes 4 Yes; per user program Yes; per user program SNMP Configuration and DCP Read Only
3. Interface
Interface types
● RS 485 ● Number of ports	Yes; X3 1
Protocols
● PROFIBUS DP master ● PROFIBUS DP device ● SIMATIC communication	Yes No Yes
PROFIBUS DP master
● Number of connections, max. ● max. number of DP devices	48; for the integrated PROFIBUS DP interface 125; In total, up to 1 000 distributed I/O devices can be connected via AS-i, PROFIBUS or PROFINET
Services
— Equidistance — Isochronous mode — activation/deactivation of DP devices	Yes Yes Yes
Interface types
RJ 45 (Ethernet)
● 100 Mbps ● Autonegotiation ● Autocrossing ● Industrial Ethernet status LED	Yes Yes Yes Yes
RS 485
● Transmission rate, max.	12 Mbit/s
Protocols
PROFIsafe	No
Number of connections
● Number of connections, max. ● Number of connections reserved for ES/HMI/web ● Number of connections via integrated interfaces ● Number of S7 routing paths	256; via integrated interfaces of the CPU and connected CPs / CMs 10 128 16
Redundancy mode
● H-Sync forwarding	Yes
Media redundancy
— Media redundancy — MRP — MRP interconnection, supported — MRPD — Switchover time on line break, typ. — Number of stations in the ring, max.	only via 1st interface (X1) Yes; MRP Automanager according to IEC 62439-2 Edition 2.0, MRP Manager; MRP Client Yes; as MRP ring node according to IEC 62439-2 Edition 3.0 Yes; Requirement: IRT 200 ms; For MRP, bumpless for MRPD 50
SIMATIC communication
● PG/OP communication ● S7 routing ● Data record routing ● S7 communication, as server ● S7 communication, as client ● User data per job, max.	Yes; encryption with TLS V1.3 pre-selected Yes Yes Yes Yes See online help (S7 communication, user data size)
Open IE communication
● TCP/IP — Data length, max. — several passive connections per port, supported ● ISO-on-TCP (RFC1006) — Data length, max. ● UDP — Data length, max. — UDP multicast ● DHCP ● DNS ● SNMP ● DCP ● LLDP ● Encryption	Yes 64 kbyte Yes Yes 64 kbyte Yes 2 kbyte; 1 472 bytes for UDP broadcast Yes; max. 118 multicast circuits Yes Yes Yes Yes Yes Yes; Optional
Web server
● HTTP ● HTTPS ● web API — Number of sessions, max. — number of simultaneous HTTP calls, max. 4 — HTTP request body, max.	Yes; Standard and user pages Yes; Standard and user pages 100 4 131 072 byte
OPC UA
● Runtime license required ● OPC UA Client — Application authentication — Security policies — User authentication — Number of connections, max. — Number of nodes of the client interfaces, recommended max. — Number of elements for one call of OPC_UA_NodeGetHandleList/OPC_UA_ReadList/OPC_UA_WriteList, max. — Number of elements for one call of OPC_UA_NameSpaceGetIndexList, max. — Number of elements for one call of OPC_UA_MethodGetHandleList, max. — Number of simultaneous calls of the client	Yes; “Medium” license required Yes; Data Access (registered Read/Write), Method Call Yes Available security policies: None, Basic128Rsa15, Basic256Rsa15, Basic256Sha256 “anonymous” or by user name & password 10 2000 300 20 100 1
instructions for session management, per connection, max. — Number of simultaneous calls of the client instructions for data access, per connection, max. — Number of registerable nodes, max. — Number of registerable method calls of OPC_UA_MethodCall, max. — Number of inputs/outputs when calling OPC_UA_MethodCall, max.	5 5000 100 20
● OPC UA Server	Yes; data access (read, write, subscribe), method call, alarms & condition (A&C), custom address space, role-based access control
— Application authentication — Security policies — User authentication — GDS support (certificate management) — Number of sessions, max. — Number of accessible variables, max. — Number of registerable nodes, max. — Number of subscriptions per session, max. — Sampling interval, min. — Publishing interval, min. — Number of server methods, max. — Number of inputs/outputs per server method, max. — Number of monitored items, recommended max. — Number of server interfaces, max. — Number of nodes for user-defined server interfaces, max. ● Alarms and Conditions — Number of program alarms — Number of alarms for system diagnostics	Yes available security policies: None, Basic128Rsa15, Basic256Rsa15, Basic256Sha256, Aes128Sha256RsaOaep, Aes256Sha256RsaPss “anonymous” or by user name & password Yes 48 100 000 20 000 50 100 ms 100 ms 50; max. 20 concurrently running jobs each for asynchronous instructions OPC_UA_ServerMethodPre and OPC_UA_ServerMethodPost 20 4 000; for 1 s sampling interval and 1 s send interval 10 of each “Server interfaces” / “Companion specification” type and 20 of the type “Reference namespace” 30 000 Yes 200 100
Further protocols
● MODBUS	Yes; MODBUS TCP
Isochronous mode
Equidistance	Yes
S7 message functions
Number of login stations for message functions, max.	64
number of subscriptions, max.	500
number of tags/attributes for subscriptions, max.	8 000
Program alarms	Yes
Number of configurable program messages, max.	10 000; Program messages are generated by the “Program_Alarm” block, ProDiag or GRAPH
Number of loadable program messages in RUN, max.	10 000
Number of simultaneously active program alarms ● Number of program alarms ● Number of alarms for system diagnostics ● Number of alarms for motion technology objects	1 000 200 160
Test commissioning functions
Joint commission (Team Engineering)	Yes; Parallel online access possible for up to 8 engineering systems
Status block	Yes; Up to 8 simultaneously (in total across all ES clients)
Single step	No
Number of breakpoints	8
Profiling	Yes
Status/control
● Status/control variable ● Variables ● Number of variables, max. — of which status variables, max. — of which control variables, max	Yes Inputs/outputs, memory bits, DBs, distributed I/Os, timers, counters 200; per job 200; per job
Forcing
● Forcing ● Forcing, variables ● Number of variables, max.	Yes Peripheral inputs/outputs 200
Diagnostic buffer
● present ● Number of entries, max. — of which powerfail-proof	Yes 3200 500
Traces
● Number of configurable Traces ● Memory size per trace, max.	4 512 kbyte
Interrupts/diagnostics/status information
Diagnostics indication LED
● RUN/STOP LED ● ERROR LED ● MAINT LED ● STOP ACTIVE LED ● Connection display LINK TX/RX	Yes Yes Yes Yes Yes
Supported technology objects
Motion Control ● Number of available Motion Control resources for technology objects ● Required Motion Control resources — per speed-controlled axis — per positioning axis — per synchronous axis — per external encoder — per output cam — per cam track — per probe ● Positioning axis — Number of positioning axes at motion control cycle of 4 ms (typical value) — Number of positioning axes at motion control cycle of 8 ms (typical value)	Yes; Note: The number of technology objects affects the cycle time of the PLC program; selection guide via the TIA Selection Tool 2 400 40 80 160 80 20 160 40 11 20
Controller ● PID_Compact ● PID_3Step ● PID-Temp	Yes; Universal PID controller with integrated optimization Yes; PID controller with integrated optimization for valves Yes; PID controller with integrated optimization for temperature
Counting and measuring ● High-speed counter	Yes
Standards, approvals, certificates
Siemens Eco Profile (SEP)	Siemens EcoTech
Ecological footprint
● environmental product declaration	Yes
Global warming potential
— global warming potential, (total) [CO2 eq] — global warming potential, (during production) [CO2 eq] — global warming potential, (during operation) [CO2 eq] — global warming potential, (after end of life cycle) [CO2 eq]	102kg 26.5kg 76.7kg -0.898kg
product functions / security / header
PROFINET Security Class	1
signed firmware update	Yes
Secure Boot	Yes
safely removing data	Yes
Ambient conditions
Ambient temperature during operation
● horizontal installation, min. ● horizontal installation, max. ● vertical installation, min. ● vertical installation, max.	-30 °C; No condensation 60 °C; Display: 50 °C, at an operating temperature of typically 50 °C, the display is switched off -30 °C; No condensation 40 °C; Display: 40 °C, at an operating temperature of typically 40 °C, the display is switched off
Ambient temperature during storage/transportation
● min. ● max.	-40 °C 70 °C
Altitude during operation relating to sea level
● Installation altitude above sea level, max.	5 000 m; Restrictions for installation altitudes > 2 000 m, see manual
configuration / header
configuration / programming / header
Programming language
— LAD — FBD — STL — SCL — CFC — GRAPH	Yes Yes Yes Yes Yes Yes
Know-how protection
● User program protection/password protection ● Copy protection ● Block protection	Yes Yes Yes
Access protection
● protection of confidential configuration data ● Password for display ● Protection level: Write protection ● Protection level: Read/write protection ● Protection level: Write protection for Failsafe ● Protection level: Complete protection ● User administration ● Number of users ● Number of groups ● Number of roles	Yes Yes Yes Yes No Yes Yes; device-wide and centralized 100 100 50
programming / cycle time monitoring / header
● lower limit ● upper limit	adjustable minimum cycle time adjustable maximum cycle time
Dimensions
Width	70 mm
Height	147 mm
Depth	129 mm
Weights
Weight, approx.	469 g