Siemens 6ES7291-8GH23-0XA0 – memory mod. MC 291 f.CPU 22X 64KB
Siemens 6ES7291-8GH23-0XA0 – memory mod. MC 291 f.CPU 22X 64KB from the SIMATIC S7 range. Status: discontinued by the manufacturer, no longer available new since November 2025. Van Haelen supplies it refurbished or new in sealed factory packaging, with a 24-month warranty.
Also written as: 6ES7 291-8GH23-0XA0, 6ES72918GH230XA0
The Siemens 6ES7291-8GH23-0XA0 is a S7-1200/1500 control component from the PLCs system range. Manufacturer type designation: memory mod. MC 291 f.CPU 22X 64KB. Status: discontinued by the manufacturer, no longer available new since November 2025. Key data: weight 0.004 kg, HS code 85389091. When replacing, carry over the firmware version and memory card of the old unit and keep a backup of the program at hand. Ask us about exchange, repair and a spare-parts pool for your installation.
Available as
Product data
| Manufacturer | Siemens |
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| Part number | 6ES7291-8GH23-0XA0 |
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| Type designation | memory mod. MC 291 f.CPU 22X 64KB |
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| Series | SIMATIC S7 |
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| Manufacturer status | discontinued by the manufacturer, no longer available new since November 2025 |
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| ETIM | EC000236 |
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| HS code | 85389091 |
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| Weight | 0,004 kg |
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| Dimensions | 8,00 x 5,00 x 2,00 cm |
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Documentation from the manufacturer
All products of the SIMATIC S7 series
Faults and fixes 6ES7291-8GH23-0XA0
Problems with 6ES7291-8GH23-0XA0: 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.
6ES7291-8GH23-0XA0 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 6ES7291-8GH23-0XA0?
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 6ES7291-8GH23-0XA0?
Replacing from stock is the fastest route when a machine is down. Van Haelen supplies the 6ES7291-8GH23-0XA0 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 6ES7291-8GH23-0XA0 still available?
Not new from the manufacturer any more: the 6ES7291-8GH23-0XA0 was discontinued since November 2025. Van Haelen supplies it refurbished and tested.
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.
What should I check when replacing a 6ES7291-8GH23-0XA0?
Carry over the firmware version and memory card of the old unit and keep a backup of the program at hand. Check the product version (issue) on the rating plate.
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.