Siemens 6AV6641-0CA01-0AX1 – Operator Panel OP77B (2C
Siemens 6AV6641-0CA01-0AX1 – Operator Panel OP77B (2C from the Operator Panels 70 series range. Status: discontinued by the manufacturer, no longer available new since October 2026. Van Haelen supplies it refurbished or new in sealed factory packaging, with a 24-month warranty.
Also written as: 6AV6 641-0CA01-0AX1, 6AV66410CA010AX1
The Siemens 6AV6641-0CA01-0AX1 is a operator panel or industrial PC from the SIMATIC HMI (Operator Panels 70 series) range. Manufacturer type designation: Operator Panel OP77B (2C. Status: discontinued by the manufacturer, no longer available new since October 2026. Key data: weight 0.541 kg, dimensions 19,30 x 15,80 x 5,60 cm, HS code 85371098. Back up the project before replacing the panel and check that the software version matches. 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 | 6AV6641-0CA01-0AX1 |
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| Type designation | Operator Panel OP77B (2C |
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| Series | Operator Panels 70 series |
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| Manufacturer status | discontinued by the manufacturer, no longer available new since October 2026 |
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| Predecessor | 6AV6641-0CA01-0AX0 |
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| ETIM | EC001412 |
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| HS code | 85371098 |
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| Country of origin | DE |
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| Weight | 0,541 kg |
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| Dimensions | 19,30 x 15,80 x 5,60 cm |
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Documentation from the manufacturer
All products of the Operator Panels 70 series series
Faults and fixes 6AV6641-0CA01-0AX1
Problems with 6AV6641-0CA01-0AX1: screen dark or backlight weak
A screen that keeps getting darker or is only readable with a torch has a worn backlight; on older panels (OP, TP, MP) that is a CCFL tube, on newer ones LEDs. A screen that stays off while the panel still communicates points to the backlight supply or inverter. Both are replaced in a refurbishment; a refurbished panel usually costs less than a single repair plus the downtime.
6AV6641-0CA01-0AX1: touch does not respond or responds in the wrong spot
If the touch screen responds offset, recalibrate it first (Control Panel or Loader, touch calibration). Dead zones, ghost touches or a corner that no longer responds are a worn touch foil; that is replaced in a refurbishment. On key panels (OP, keypad) worn membrane keys are the equivalent.
6AV6641-0CA01-0AX1 starts in the Loader or shows no project
If the panel starts in the Loader (Transfer, Start, Control Panel) without opening the project, the project is no longer present or is corrupted. Download it again from WinCC flexible, WinCC or TIA Portal, or restore a backup with ProSave. Without the project file this cannot be recovered: always keep a backup of every panel in the installation.
6AV6641-0CA01-0AX1: #### in the fields or connection to the PLC lost
Hashes in the fields mean the panel does not get its tags from the PLC. Check the connection settings (PROFIBUS address and baud rate, or IP address and rack/slot), the cable and whether the PLC is in RUN. After replacing the panel the same connection settings must be in the project and the project's runtime version must match the panel type.
Fault not fixed: replace, exchange or repair the 6AV6641-0CA01-0AX1?
Replacing from stock is the fastest route when a machine is down. Van Haelen supplies the 6AV6641-0CA01-0AX1 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 6AV6641-0CA01-0AX1 still available?
Not new from the manufacturer any more: the 6AV6641-0CA01-0AX1 was discontinued since October 2026. Van Haelen supplies it refurbished and tested.
Does the 6AV6641-0CA01-0AX1 replace the 6AV6641-0CA01-0AX0?
Yes. According to the manufacturer the 6AV6641-0CA01-0AX1 is the successor of the 6AV6641-0CA01-0AX0. Before replacing, check that the project and the connections match the new version; if in doubt we also supply the 6AV6641-0CA01-0AX0 itself, refurbished or new, as long as it can be found.
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 6AV6641-0CA01-0AX1?
Back up the project before replacing the panel and check that the project's software version matches the panel.
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.