Siemens 6GK5991-1AF00-8GA0 – SCALANCE X SFP991-1LD Lc-port
Siemens 6GK5991-1AF00-8GA0 – SCALANCE X SFP991-1LD Lc-port. Van Haelen supplies it refurbished, with a 24-month warranty.
Also written as: 6GK5 991-1AF00-8GA0, 6GK59911AF008GA0
The Siemens 6GK5991-1AF00-8GA0 is a S7-300 control component. Manufacturer type designation: SCALANCE X SFP991-1LD Lc-port. When replacing, check the product version (issue) on the rating plate; for most installations the same or a higher issue is suitable. 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 | 6GK5991-1AF00-8GA0 |
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| Type designation | SCALANCE X SFP991-1LD Lc-port |
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| ETIM | EC001423 |
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Documentation from the manufacturer
Faults and fixes 6GK5991-1AF00-8GA0
Problems with 6GK5991-1AF00-8GA0: the red F LED is on
The F (fault) LED of a SCALANCE switch also comes on when one of the two redundant power inputs L1/L2 is not connected; that is the most common message and not a defect. Also: a port configured as monitored without link, a ring fault or a rejected C-PLUG. The cause is shown in the web interface under Fault.
What do I check when replacing a 6GK5991-1AF00-8GA0?
Carry over the C-PLUG with the configuration, then the replacement starts with the same settings. Without C-PLUG set the IP address, VLANs and ring settings again via the web interface or PST. Check that the firmware version matches the ring or redundancy partners.
Fault not fixed: replace, exchange or repair the 6GK5991-1AF00-8GA0?
Replacing from stock is the fastest route when a machine is down. Van Haelen supplies the 6GK5991-1AF00-8GA0 refurbished: tested to this family's test protocol, with a test report per serial number, 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
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 6GK5991-1AF00-8GA0?
Check the product version (issue) on the rating plate; for most installations the same or a higher issue is suitable.
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.