VFD vs Servo Drive: Key Differences
A side-by-side comparison of VFD and servo drive motor type, feedback, dynamic response, overload rating, cost, and applications for industrial engineers.
The Siemens 6ES7515-2UN03-0AB0 is a SIMATIC S7-1500T CPU 1515TF-2 PN with 1.5 MB program memory and 4.5 MB data memory, combining fail-safe and motion (Technology) functions in one CPU. Its first PROFINET interface has an integrated 2-port IRT switch, the second runs PROFINET RT, and typical bit-instruction processing takes 6 ns. A SIMATIC Memory Card is required to operate.
The T in 1515TF-2 PN adds Technology objects for motion control (positioning, synchronous operation, cams) on top of the standard 1515F safety functions, so pick this CPU over a plain 1515F when the application needs coordinated axis motion, not just fail-safe logic. The integrated 2-port IRT switch on interface 1 supports isochronous real-time PROFINET for motion-critical I/O, while the second RT-only interface is better suited to a separate, non-time-critical network segment such as plant-level supervision.
Used as the controller for machines that combine safety-rated logic with coordinated axis motion — such as packaging equipment, printing presses, and material-handling systems — where PROFINET IRT drives synchronized servo axes on one interface while a separate PROFINET RT connection handles supervisory or HMI traffic.
| Product type designation | CPU 1515TF-2 PN |
|---|---|
| HW functional status | FS05 |
| Firmware version | V4.1 |
| FW update possible | Yes |
| Product function: I&M data | Yes; I&M0 to I&M3 |
| Product function: Isochronous mode | Yes; Distributed and central; with minimum OB 6x cycle of 375 µs (distributed) and 1 ms (central) |
| Product function: SysLog | Yes |
| Engineering with: STEP 7 TIA Portal configurable/integrated from version | V21 (FW V4.1) / V18 (FW V3.0) or higher; configurable with older TIA Portal versions as 6ES7515-2UM01-0AB0 |
| via dataset | Yes |
|---|
| Screen diagonal [cm] | 6.1 cm |
|---|
| Part number | 6ES7515-2UN03-0AB0 |
|---|---|
| Type designation | CPU 1515TF-2 PN |
| Brand | Siemens |
| Condition | New, factory sealed |
| Source | Siemens and its authorised distributors |
| Warranty | Manufacturer warranty |
| Lifecycle status | Active, in production |
| EAN | 4047623412434 |
| ETIM class | EC000236 |
| eCl@ss | 27242207 |
| Number of keys | 8 |
|---|---|
| Mode buttons | 2 |
| 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 | 5 ms |
| Mains buffering: Repeat rate, min. | 1/s |
| Current consumption (rated value) | 0.65 A |
|---|---|
| Current consumption, max. | 1.03 A |
| Inrush current, max. | 1.15 A; Rated value |
| I2t | 0.6 A2·s |
| Infeed power to the backplane bus | 12 W |
|---|---|
| Power consumption from the backplane bus (balanced) | 6.2 W |
| Power loss, typ. | 3.6 W |
|---|
| Number of slots for SIMATIC memory card | 1 |
|---|---|
| SIMATIC memory card required | Yes |
| Work memory: integrated (for program) | 1.5 Mbyte |
| Work memory: integrated (for data) | 4.5 Mbyte |
| Load memory: Plug-in (SIMATIC Memory Card), max. | 32 Gbyte |
| Backup: maintenance-free | Yes |
| 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 |
| Number of elements (total) | 8 000; Blocks (OB, FB, FC, DB) and UDTs |
|---|---|
| DB: Number range | 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 |
| DB: Size, max. | 4.5 Mbyte; For DBs with absolute addressing, the max. size is 64 KB |
| FB: Number range | 0 ... 65 535 |
| FB: Size, max. | 1 Mbyte |
| FC: Number range | 0 ... 65 535 |
| FC: Size, max. | 1 Mbyte |
| OB: Size, max. | 1 Mbyte |
| OB: Number of free cycle OBs | 100 |
| OB: Number of time alarm OBs | 20 |
| OB: Number of delay alarm OBs | 20 |
| OB: Number of cyclic interrupt OBs | 20; With minimum OB 3x cycle of 250 µs |
| OB: Number of process alarm OBs | 50 |
| OB: Number of DPV1 alarm OBs | 3 |
| OB: Number of isochronous mode OBs | 2 |
| OB: Number of startup OBs | 100 |
| OB: Number of asynchronous error OBs | 4 |
| OB: Number of synchronous error OBs | 2 |
| OB: Number of diagnostic alarm OBs | 1 |
| Nesting depth: per priority class | 24; Up to 8 possible for F-blocks |
| S7 counter: Number Retentivity | 2 048 |
|---|---|
| S7 counter: adjustable | Yes |
| IEC counter: Number Retentivity | Any (only limited by the main memory) |
| IEC counter: adjustable | Yes |
| S7 timer: Number Retentivity | 2 048 |
| S7 timer: adjustable | Yes |
| IEC timer: Number Retentivity | Any (only limited by the main memory) |
| IEC timer: can be set | Yes |
| Retentive data area (incl. timers, counters, flags), max. | 472 kbyte; in total; for bit memories, timers, counters, DBs, and technology data (axes) |
|---|---|
| Extended retentive data area (incl. timers, counters, flags), max. | 4.5 Mbyte; When using PS 6 0W 24/48/60 V DC HF |
| Flag: Size, max. | 16 kbyte |
| Flag: Number of clock memories | 8; 8 clock memory bit, grouped into one clock memory byte |
| Data blocks: Retentivity adjustable | Yes |
| Data blocks: Retentivity preset | No |
| Local data: per priority class, max. | 64 kbyte; max. 16 KB per block |
| Number of IO modules | 8 192; max. number of modules / submodules |
|---|---|
| I/O address area: Inputs | 32 kbyte; All inputs are in the process image |
| I/O address area: Outputs per integrated IO subsystem | 32 kbyte; All outputs are in the process image |
| I/O address area: Inputs (volume) | 8 kbyte |
| I/O address area: Outputs (volume) per CM/CP | 8 kbyte |
| I/O address area: Outputs (volume) | 8 kbyte |
| Subprocess images: Number of subprocess images, max. | 32 |
| 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: Via CM | 8; A maximum of 8 CMs/CPs (PROFIBUS, PROFINET, Ethernet) can be inserted in total |
| Number of IO Controllers: Integrated | 2 |
| Number of IO Controllers: via CM | 8; A maximum of 8 CMs/CPs (PROFIBUS, PROFINET, Ethernet) can be inserted in total |
| Rack: Modules per rack, max. | 32; CPU + 31 modules |
| Rack: Number of lines, max. | 1 |
| PtP CM: Number of PtP CMs | the number of connectable PtP CMs is only limited by the number of available slots |
| Clock: Type | Hardware clock |
|---|---|
| Clock: Backup time | 6 wk; At 40 °C ambient temperature, typically |
| Clock: Deviation per day, max. | 10 s; Typ.: 2 s |
| Operating hours counter: Number | 64 |
| Clock synchronization: supported | Yes |
| Clock synchronization: to DP, master | Yes; via PROFIBUS CM / CP |
| Clock synchronization: on DP, device | Yes; via PROFIBUS CM / CP |
| Clock synchronization: in AS, master | Yes |
| Clock synchronization: in AS, device | Yes |
| Clock synchronization: on Ethernet via NTP | Yes |
| Number of PROFINET interfaces 1. Interface | 2 |
|---|---|
| Interface types: RJ 45 (Ethernet) | Yes; X1 |
| Interface types: Number of ports | 2 |
| Interface types: integrated switch | Yes |
| Protocols: IP protocol | Yes; IPv4 |
| Protocols: PROFINET IO Controller | Yes |
| Protocols: PROFINET IO device | Yes |
| Protocols: SIMATIC communication | Yes |
| Protocols: Open IE communication | Yes; Optionally also encrypted |
| Protocols: Web server | Yes |
| Protocols: Media redundancy | Yes |
| PROFINET IO Controller Services: Isochronous mode | Yes |
| PROFINET IO Controller Services: Direct data exchange | Yes; Requirement: IRT and isochronous mode (MRPD optional) |
| PROFINET IO Controller Services: IRT | Yes |
| PROFINET IO Controller Services: Dynamic Frame Packing (DFP) | Yes |
| PROFINET IO Controller Services: PROFIenergy | Yes; per user program |
| PROFINET IO Controller Services: Prioritized startup | Yes; Max. 32 PROFINET devices |
| PROFINET IO Controller Services: Number of connectable IO Devices, max. | 256; in total, up to 1024 distributed I/O devices can be connected via AS-i, PROFIBUS or PROFINET |
| PROFINET IO Controller Services: Of which IO devices with IRT, max. | 64 |
| PROFINET IO Controller Services: of which in line, max. | 256 |
| PROFINET IO Controller Services: Number of IO Devices that can be simultaneously activated/deactivated, max. | 8; in total across all interfaces |
| PROFINET IO Controller Services: Number of IO Devices per tool, max. | 8 |
| PROFINET IO Controller Services: Updating times Update time for IRT | 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 |
| PROFINET IO Controller Services: for send cycle of 250 µs | 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 |
| PROFINET IO Controller Services: for send cycle of 500 µs | 500 µs to 8 ms |
| PROFINET IO Controller Services: for send cycle of 1 ms | 1 ms to 16 ms |
| PROFINET IO Controller Services: for send cycle of 2 ms | 2 ms to 32 ms |
| PROFINET IO Controller Services: for send cycle of 4 ms | 4 ms to 64 ms |
| PROFINET IO Controller Services: With IRT and parameterization of "odd" send cycles Update time for RT | Update time = set "odd" send clock (any multiple of 125 µs: 375 µs, 625 µs ... 3 875 µs) |
| PROFINET IO Device Services: Isochronous mode | No |
| PROFINET IO Device Services: IRT | Yes |
| PROFINET IO Device Services: Dynamic Frame Packing (DFP) | No |
| PROFINET IO Device Services: PROFIenergy | Yes; per user program |
| PROFINET IO Device Services: Prioritized startup | Yes |
| PROFINET IO Device Services: Shared device | Yes |
| PROFINET IO Device Services: Number of IO Controllers with shared device, max. | 4 |
| PROFINET IO Device Services: activation/deactivation of I-devices | Yes; per user program |
| PROFINET IO Device Services: Asset management record | Yes; per user program |
| Interface types: RJ 45 (Ethernet) | Yes; X2 |
|---|---|
| Interface types: Number of ports | 1 |
| Interface types: integrated switch | No |
| Protocols: IP protocol | Yes; IPv4 |
| Protocols: PROFINET IO Controller | Yes |
| Protocols: PROFINET IO Device | Yes |
| Protocols: SIMATIC communication | Yes |
| Protocols: Open IE communication | Yes; Optionally also encrypted |
| Protocols: Web server | Yes |
| Protocols: Media redundancy | No |
| PROFINET IO Controller Services: Isochronous mode | No |
| PROFINET IO Controller Services: Direct data exchange | No |
| PROFINET IO Controller Services: IRT | No |
| PROFINET IO Controller Services: Dynamic Frame Packing (DFP) | No |
| PROFINET IO Controller Services: PROFIenergy | Yes; per user program |
| PROFINET IO Controller Services: Prioritized startup | No |
| PROFINET IO Controller Services: Number of connectable IO Devices, max. | 32; in total, up to 1024 distributed I/O devices can be connected via AS-i, PROFIBUS or PROFINET |
| PROFINET IO Controller Services: of which in line, max. | 32 |
| PROFINET IO Controller Services: Number of IO Devices that can be simultaneously activated/deactivated, max. | 8; in total across all interfaces |
| PROFINET IO Controller Services: IO Devices changing during operation (partner ports), supported | Yes |
| PROFINET IO Controller Services: Number of IO Devices per tool, max. | 8 |
| PROFINET IO Controller Services: 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 |
| PROFINET IO Controller Services: PROFINET Security Class Update time for RT | 1 |
| PROFINET IO Controller Services: for send cycle of 1 ms | 1 ms to 512 ms |
| PROFINET IO Device Services: Isochronous mode | No |
| PROFINET IO Device Services: IRT | No |
| PROFINET IO Device Services: Dynamic Frame Packing (DFP) | No |
| PROFINET IO Device Services: PROFIenergy | Yes; per user program |
| PROFINET IO Device Services: Prioritized startup | No |
| PROFINET IO Device Services: Shared device | Yes |
| PROFINET IO Device Services: Number of IO Controllers with shared device, max. | 4 |
| PROFINET IO Device Services: activation/deactivation of I-devices | Yes; per user program |
| PROFINET IO Device Services: Asset management record | Yes; per user program |
| PROFINET IO Device Services: PROFINET Security Class | SNMP Configuration and DCP Read Only |
| RJ 45 (Ethernet): 100 Mbps | Yes |
|---|---|
| RJ 45 (Ethernet): Autonegotiation | Yes |
| RJ 45 (Ethernet): Autocrossing | Yes |
| RJ 45 (Ethernet): Industrial Ethernet status LED | Yes |
| PROFIsafe | Yes; V2.4 / V2.6 |
|---|---|
| Number of connections: Number of connections, max. | 256; via integrated interfaces of the CPU and connected CPs / CMs |
| Number of connections: Number of connections reserved for ES/HMI/web | 10 |
| Number of connections: Number of connections via integrated interfaces | 128 |
| Number of connections: Number of S7 routing paths | 16 |
| Redundancy mode: PROFINET system redundancy (S2) | No |
| Redundancy mode: PROFINET system redundancy (R1) | No |
| Redundancy mode: H-Sync forwarding Media redundancy | Yes |
| Redundancy mode: Media redundancy | only via 1st interface (X1) |
| Redundancy mode: MRP | Yes; MRP Automanager according to IEC 62439-2 Edition 2.0, MRP Manager; MRP Client |
| Redundancy mode: MRP interconnection, supported | Yes; as MRP ring node according to IEC 62439-2 Edition 3.0 |
| Redundancy mode: MRPD | Yes; Requirement: IRT |
| Redundancy mode: Switchover time on line break, typ. | 200 ms; For MRP, bumpless for MRPD |
| Redundancy mode: Number of stations in the ring, max. | 50 |
| SIMATIC communication: PG/OP communication | Yes; encryption with TLS V1.3 pre-selected |
| SIMATIC communication: S7 routing | Yes |
| SIMATIC communication: Data record routing | Yes |
| SIMATIC communication: S7 communication, as server | Yes |
| SIMATIC communication: S7 communication, as client | Yes |
| SIMATIC communication: User data per job, max. | See online help (S7 communication, user data size) |
| Open IE communication: TCP/IP | Yes |
| Open IE communication: Data length, max. | 64 kbyte |
| Open IE communication: several passive connections per port, supported | Yes |
| Open IE communication: ISO-on-TCP (RFC1006) | Yes |
| Open IE communication: UDP | Yes |
| Open IE communication: UDP multicast | Yes; max. 118 multicast circuits |
| Open IE communication: DHCP | Yes |
| Open IE communication: DNS | Yes |
| Open IE communication: SNMP | Yes |
| Open IE communication: DCP | Yes |
| Open IE communication: LLDP | Yes |
| Open IE communication: Encryption | Yes; Optional |
| Web server: HTTP | Yes; Standard and user pages |
| Web server: HTTPS | Yes; Standard and user pages |
| web API: Number of sessions, max. | 100 |
| web API: number of simultaneous HTTP calls, max. | 4 |
| web API: HTTP request body, max. | 131 072 byte |
| OPC UA: Runtime license required | Yes; "Medium" license required |
| OPC UA: OPC UA Client | Yes; Data Access (registered Read/Write), Method Call |
| OPC UA: Application authentication | Yes |
| OPC UA: Security policies | Available security policies: None, Basic128Rsa15, Basic256Rsa15, Basic256Sha256 |
| OPC UA: User authentication | "anonymous" or by user name & password |
| OPC UA: Number of connections, max. | 10 |
| OPC UA: Number of nodes of the client interfaces, recommended max. | 2 000 |
| Number of elements for one call of 300 OPC_UA_NodeGetHandleList/OPC_UA_ReadList/OPC_UA_WriteList, max.: Number of elements for one call of OPC_UA_NameSpaceGetIndexList, max. | 20 |
| Further protocols: MODBUS | Yes; MODBUS TCP |
| 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 | 1 000 |
| Number of simultaneously active program alarms: Number of alarms for system diagnostics | 200 |
| 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 | Yes; without fail-safe |
| Status/control: Variables | inputs/outputs, bit memories, DBs, peripheral I/Os (without fail-safe), times, counters |
| Number of variables, max.: of which status variables, max. | 200; per job |
| Number of variables, max.: of which control variables, max. | 200; per job |
| Forcing: Forcing | Yes; without fail-safe |
| Forcing: Forcing, variables | peripheral inputs/outputs (without fail-safe) |
| Forcing: Number of variables, max. | 200 |
| Diagnostic buffer: present | Yes |
| Diagnostic buffer: Number of entries, max. | 3 200 |
| Diagnostic buffer: of which powerfail-proof | 500 |
| Traces: Number of configurable Traces | 4 |
| Traces: Memory size per trace, max. | 512 kbyte |
| Diagnostics indication LED: RUN/STOP LED | Yes |
|---|---|
| Diagnostics indication LED: ERROR LED | Yes |
| Diagnostics indication LED: MAINT LED | Yes |
| Diagnostics indication LED: STOP ACTIVE LED | Yes |
| Diagnostics indication LED: Connection display LINK TX/RX | Yes |
| Motion Control | Yes; Note: The number of technology objects affects the cycle time of the PLC program; selection guide via the TIA Selection Tool |
|---|---|
| Number of available Motion Control resources for technology objects | 2 400 |
| Required Motion Control resources: per speed-controlled axis | 40 |
| Required Motion Control resources: per positioning axis | 80 |
| Required Motion Control resources: per synchronous axis | 160 |
| Required Motion Control resources: per external encoder | 80 |
| Required Motion Control resources: per output cam | 20 |
| Required Motion Control resources: per cam track | 160 |
| Required Motion Control resources: per probe | 40 |
| Required Motion Control resources: Number of available Extended Motion Control resources for technology objects | 120 |
| Required Extended Motion Control resources: per cam (1 000 points and 50 segments) | 2 |
| Required Extended Motion Control resources: per cam (10 000 points and 50 segments) | 20 |
| Required Extended Motion Control resources: per cam (50 points and 600 segments) | 2 |
| Required Extended Motion Control resources: for each set of kinematics | 30 |
| Required Extended Motion Control resources: per Interpreter | 60 |
| Required Extended Motion Control resources: Per leading axis proxy | 3 |
| kinematics functions: kinematics with up to 4 interpolating axes | Yes; max. 3D + orientation |
| kinematics functions: kinematics with 5 or more interpolating axes | No |
| kinematics functions: user-defined kinematics | No |
| kinematics functions: SIMATIC Safe Kinematics | No |
| Positioning axis: Number of positioning axes at motion control cycle of 4 ms (typical value) | 11 |
| Controller: PID_Compact | Yes; Universal PID controller with integrated optimization |
| Controller: PID_3Step | Yes; PID controller with integrated optimization for valves |
| Controller: PID-Temp | Yes; PID controller with integrated optimization for temperature |
| Counting and measuring: High-speed counter | Yes |
| Siemens Eco Profile (SEP) | Siemens EcoTech |
|---|---|
| Recycler Guide available | Yes |
| Ecological footprint: environmental product declaration Global warming potential | Yes |
| Ecological footprint: global warming potential, (total) [CO2 eq] | 100 kg |
| Ecological footprint: global warming potential, (during production) [CO2 eq] | 25.8 kg |
| Ecological footprint: global warming potential, (during operation) [CO2 eq] | 75.2 kg |
| Ecological footprint: global warming potential, (after end of life cycle) [CO2 eq] | -0.83 kg |
| Highest safety class achievable in safety mode: Performance level according to ISO 13849-1 | PLe |
| Highest safety class achievable in safety mode: SIL acc. to IEC 61508 Probability of failure (for service life of 20 years and repair time of 100 hours) | SIL 3 |
| Highest safety class achievable in safety mode: Low demand mode: PFDavg in accordance with SIL3 | < 2.00E-05 |
| Highest safety class achievable in safety mode: High demand/continuous mode: PFH in accordance with SIL3 | < 1.00E-09 |
| PROFINET Security Class | 1 |
|---|---|
| signed firmware update | Yes |
| Secure Boot | Yes |
| securely removing data | Yes |
| Ambient temperature during operation: horizontal installation, min. | -30 °C; No condensation |
|---|---|
| Ambient temperature during operation: vertical installation, min. | -30 °C; No condensation |
| Ambient temperature during storage/transportation: min. | -40 °C |
| Ambient temperature during storage/transportation: max. | 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 |
| Programming Programming language: LAD | Yes; incl. failsafe |
|---|---|
| Programming Programming language: FBD | Yes; incl. failsafe |
| Programming Programming language: STL | Yes |
| Programming Programming language: SCL | Yes |
| Programming Programming language: CFC | Yes; either CFC or failsafe functionality |
| Programming Programming language: GRAPH | Yes |
| Know-how protection: User program protection/password protection | Yes |
| Know-how protection: Copy protection | Yes |
| Know-how protection: Block protection | Yes |
| Access protection: protection of confidential configuration data | Yes |
| Access protection: Password for display | Yes |
| Access protection: Protection level: Write protection | Yes |
| Access protection: Protection level: Read/write protection | Yes |
| Access protection: Protection level: Write protection for Failsafe | Yes |
| Access protection: Protection level: Complete protection | Yes |
| Access protection: User administration | Yes; device-wide and centralized |
| Access protection: Number of users | 100 |
| Access protection: Number of groups | 100 |
| Access protection: Number of roles | 50 |
| Cycle time monitoring: lower limit | adjustable minimum cycle time |
| Cycle time monitoring: upper limit | adjustable maximum cycle time |
| Width | 70 mm |
|---|---|
| Height | 147 mm |
| eClass | 16 27-24-22-07 |
|---|---|
| ETIM | 10 EC000236 |
| IDEA | 4 3565 |
| UNSPSC | 15 32-15-17-05 |
| Net weight | 0.515 kg |
|---|---|
| Country of origin | DE |
| Shipping weight | 1.015 kg |
| Ships from | Türkiye |
| Dispatch | — |
| Stock | On request |
Source: manufacturer data · Last verified: 01 Nov 2026
No documents are on file for this part yet.
Ask us for the datasheetThe rated current of CPU 1515TF-2 PN is 0.65 A.
The rated operational voltage of CPU 1515TF-2 PN is 24 V AC.
The tariff (HS) code on file for CPU 1515TF-2 PN is 85371091.
The EAN (GTIN) of CPU 1515TF-2 PN is 4047623412434.
CPU 1515TF-2 PN ships from Türkiye. Shipping calculated at checkout · import duties and taxes paid on arrival.
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