Siemens 6GK7343-1GX21-0XE0 – Communication processor CP 343-1 ADV
Siemens 6GK7343-1GX21-0XE0 – Communication processor CP 343-1 ADV from the NET range. Status: discontinued by the manufacturer, no longer available new since October 2023; successor 6GK7343-1GX31-0XE0. Van Haelen supplies it refurbished or new in sealed factory packaging, with a 24-month warranty.
Also written as: 6GK7 343-1GX21-0XE0, 6GK73431GX210XE0
The Siemens 6GK7343-1GX21-0XE0 is a S7-300 control component from the Simatic S7 (NET) range. Manufacturer type designation: Communication processor CP 343-1 ADV. Status: discontinued by the manufacturer, no longer available new since October 2023; successor according to the manufacturer: 6GK7343-1GX31-0XE0. Key data: weight 0.425 kg, dimensions 14,4 x 13,2 x 10,4 cm, HS code 85176200. 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 | 6GK7343-1GX21-0XE0 |
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| Type designation | Communication processor CP 343-1 ADV |
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| Series | NET |
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| Manufacturer status | discontinued by the manufacturer, no longer available new since October 2023 |
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| Predecessor | 6GK7343-1GX20-0XE0 |
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| Successor | 6GK7343-1GX31-0XE0 |
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| ETIM | EC001423 |
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| HS code | 85176200 |
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| Weight | 0,425 kg |
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| Dimensions | 14,4 x 13,2 x 10,4 cm |
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Documentation from the manufacturer
All products of the NET series
Faults and fixes 6GK7343-1GX21-0XE0
Problems with 6GK7343-1GX21-0XE0: no connection, SF or BF on
Check the link LED first: without link it is the cable, the switch port or the configured speed. With link but no connection: IP address, subnet and device name of the CP, a duplicate IP or MAC conflict in the network, or a project that expects a different firmware version. After replacement the new CP gets its address and name again via STEP 7, TIA or the Primary Setup Tool.
6GK7343-1GX21-0XE0: connection drops sporadically
Sporadic drop-outs come from the network more often than from the CP: a duplex mismatch (fixed 100 full against auto), an overloaded ring, an unshielded cable next to frequency converters, or an ageing switch. Only when the fault persists with another cable and port is the CP suspect.
Fault not fixed: replace, exchange or repair the 6GK7343-1GX21-0XE0?
Replacing from stock is the fastest route when a machine is down. Van Haelen supplies the 6GK7343-1GX21-0XE0 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 6GK7343-1GX21-0XE0 still available?
Not new from the manufacturer any more: the 6GK7343-1GX21-0XE0 was discontinued since October 2023. Van Haelen supplies it refurbished and tested.
What is the successor of the 6GK7343-1GX21-0XE0?
According to the manufacturer it is the 6GK7343-1GX31-0XE0. 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.
Does the 6GK7343-1GX21-0XE0 replace the 6GK7343-1GX20-0XE0?
Yes. According to the manufacturer the 6GK7343-1GX21-0XE0 is the successor of the 6GK7343-1GX20-0XE0. Before replacing, check that the project and the connections match the new version; if in doubt we also supply the 6GK7343-1GX20-0XE0 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 6GK7343-1GX21-0XE0?
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.