Siemens 6ES7511-1AK00-0AB0 – SIMATIC S7-1500 CPU 1511-1 PN, 150 KB program, 1 MB data, PROFINET IRT with 2-port switch
Siemens 6ES7511-1AK00-0AB0 – CPU 1511-1PN 150KB Program 1MB Data from the S7-1500 range. Status: discontinued by the manufacturer, no longer available new since October 2025; successor 6ES7511-1AL03-0AB0. Van Haelen supplies it refurbished or new in sealed factory packaging, with a 24-month warranty.
Also written as: 6ES7 511-1AK00-0AB0, 6ES75111AK000AB0
Also known as: CPU1511-1PN, CPU-1511-1PN, CPU1511-1, CPU-1511-1
The Siemens 6ES7511-1AK00-0AB0 is the SIMATIC S7-1500 CPU 1511-1 PN, the central processing unit with 150 KB work memory for program and 1 MB for data. Further details: a PROFINET IRT interface with 2-port switch and 60 ns bit performance. The CPU 1511-1 PN is the entry-level CPU of the S7-1500: it is mounted on the rail, executes the program written in the TIA Portal from the Memory Card and couples via the PROFINET interface to HMI, distributed I/O, drives and network. EAN 4025515081357. Siemens keeps this type as a spare part, reports it as no longer available and discontinued it on 1 October 2025; Siemens names the 6ES7511-1AK01-0AB0 as successor, and the latest release 6ES7511-1AL03-0AB0 with more memory fits as well. When replacing, move the Memory Card with the project or load the project from the TIA Portal, carry over the supply connector and the PROFINET cables, clip the CPU onto the rail in the same place and adapt the CPU type in the hardware configuration.
Available as
Product data
| Manufacturer | Siemens |
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| Part number | 6ES7511-1AK00-0AB0 |
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| Type designation | CPU 1511-1PN 150KB Program 1MB Data |
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| Series | S7-1500 |
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| Manufacturer status | discontinued by the manufacturer, no longer available new since October 2025 |
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| Successor | 6ES7511-1AL03-0AB0 |
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| ETIM | EC000236 |
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| HS code | 85371091 |
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| Country of origin | DE |
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| Weight | 0,507 kg |
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Documentation from the manufacturer
All products of the S7-1500 series
All PLC CPUs
Faults and fixes 6ES7511-1AK00-0AB0
Problems with 6ES7511-1AK00-0AB0: ERROR LED red or flashing
A solid red ERROR LED indicates a fault that keeps the CPU in STOP (hardware, firmware or program); flashing red a fault the CPU reports while it keeps running. TIA Portal, Online & diagnostics, shows the diagnostic buffer with the cause. MAINT (yellow) is not a fault: maintenance requested, for instance a memory card running full.
6ES7511-1AK00-0AB0 does not start or the project will not load
On the S7-1200 the program is stored internally and optionally on a SIMATIC Memory Card; on the S7-1500 the card is mandatory. Check that the card is inserted and not formatted as the program card of another CPU. If the project will not load, the CPU firmware usually does not match the version the TIA project expects: check the version in the device configuration.
What do I check when replacing a 6ES7511-1AK00-0AB0?
Firmware version and issue must match the project; a higher firmware is usually fine after updating the version in TIA. Carry over the memory card or download again, and set the IP address and PROFINET device name again. Mind the protection level too: a CPU with access protection asks for the project password.
Fault not fixed: replace, exchange or repair the 6ES7511-1AK00-0AB0?
Replacing from stock is the fastest route when a machine is down. Van Haelen supplies the 6ES7511-1AK00-0AB0 refurbished (tested, with a test report per serial number) or new in factory packaging, with a 24-month warranty. The current lead time is shown with the condition on this page. Prefer an exchange: you get a refurbished unit straight away and return the faulty one within 14 days. Repairing your own unit is also possible: diagnosis, then a fixed price.
What information should I send for a quick diagnosis?
A photo of the rating plate (order number, product version, firmware), the exact fault code or LED state, when the fault occurs (at power-up, on enable, under load) and what you have already tried. For PLCs an export of the diagnostic buffer, for drives the parameter set. With that we can usually say the same day whether replacing, exchanging or repairing is best.
Frequently asked questions
Is the 6ES7511-1AK00-0AB0 still available?
Not new from the manufacturer any more: the 6ES7511-1AK00-0AB0 was discontinued since October 2025. Van Haelen supplies it refurbished and tested.
What is the successor of the 6ES7511-1AK00-0AB0?
According to the manufacturer it is the 6ES7511-1AL03-0AB0. A successor does not always fit an existing installation without changes; replacing like for like is often the fastest route. If in doubt, ask us.
What does refurbished mean?
Cleaned, inspected, aged or critical components replaced and tested to our test protocol for this product family. You get a 24-month warranty, a test report and a serial number label.
Can I exchange or repair my faulty unit?
Yes. With an exchange Van Haelen supplies a refurbished unit straight away and you return the faulty one. With a repair you first get a diagnosis and then a fixed price, with test report and warranty.