The Siemens 6GK7343-1EX21-0XE0 is a CP 343-1 communication processor for the SIMATIC S7-300 platform. It connects the S7-300 PLC to Industrial Ethernet, providing PROFINET IO Controller functionality alongside standard Ethernet protocols including ISO, TCP/IP, and UDP .
This module is the EX21 revision of the CP 343-1, distinguished from earlier EX11/EX20 models by the addition of IT functions (FTP server, HTTP diagnostics, Email, SNMP) and PG/OP multiplexing. It is a key spare for S7-300 systems that lack integrated PROFINET ports or require additional Ethernet connectivity for SCADA, HMI, and engineering stations .
Item No :
6GK7343-1EX21-0XE0Order(MOQ) :
1Payment :
EXWProduct Origin :
OriginalShipping Port :
Wuhan, Hubei, ChinaLead Time :
3-5 daysWeight :
0.507kg6GK7343-1EX21-0XE0 SIEMENS
New in stock
Origin and Brand New
Payment Method: TT.Western Union
Shipping Method: DHL\UPS\Fedex\EMS\Others
Specification
| Brand/Manufacturer | Siemens |
| Part Number | 6GK7343-1EX21-0XE0 |
| MOQ | 1PC |
| Price | The price is not real, please inquiry |
Trade Process
| Part Number | Description | Key Difference |
|---|---|---|
| 6GK7343-1EX21-0XE0 | CP 343-1 EX21 (this item) | Discontinued; remaining stock |
| 6GK7343-1EX30-0XE0 | Successor – CP 343-1 EX30 | Backward-compatible replacement |
| 6GK7343-1CX10-0XE0 | CP 343-1 Lean | No PROFINET IO Controller; device-only |
| 6GK7343-1GX21-0XE0 | CP 343-1 Advanced | Higher performance, gigabit interface |
Migration Note: When replacing an EX21 with the EX30 successor, verify the firmware version and STEP 7 configuration compatibility. The EX30 is backward-compatible but may require a firmware update in the engineering project.
1 × Siemens 6GK7343-1EX21-0XE0 CP 343-1 Communication Processor
Note: S7-300 CPU, rack, and connecting cables are sold separately. Connectors and manual are not included per Siemens supply scope .
In Stock – Limited remaining stock available
Tested – Each unit verified for functionality (refurbished units)
Warranty Included – 12-month warranty for purchase confidence
Technical Support – S7-300 compatibility and successor migration assistance available
Q1: What is the Siemens 6GK7343-1EX21-0XE0?
It is a CP 343-1 communication processor for the SIMATIC S7-300, providing Industrial Ethernet connectivity with PROFINET IO Controller, ISO, TCP/IP, and UDP protocol support .
Q2: Is this product still in production?
No. It was discontinued with a production stop date of 2010-10-01 (PM410 status). It is available only through remaining stock, refurbished units, or third-party suppliers .
Q3: What is the successor model?
The designated successor is 6GK7343-1EX30-0XE0, which is backward-compatible .
Q4: Does this module support PROFINET IO Controller?
Yes. The EX21 variant supports PROFINET IO Controller functionality, allowing the S7-300 to control PROFINET devices .
Q5: What is the difference between CP 343-1 EX21 and CP 343-1 Lean?
The EX21 supports PROFINET IO Controller and has IT functions (FTP, HTTP, Email, SNMP). The Lean version can only function as a PROFINET IO Device and lacks the IT functions .
Q6: What is the power supply requirement?
The module requires 24 V DC external (20.4–28.8 V) and draws 5 V DC from the backplane. Maximum current is 200 mA from each source .
Q7: What software is required for configuration?
STEP 7 V5.3 SP3 or higher is required for configuration .
Q8: What are the dimensions and weight?
Dimensions are 40 × 125 × 120 mm (W × H × D). Net weight is approximately 0.22 kg .
Q9: What is the operating temperature range?
0 to +60 °C for horizontal rack installation; 0 to +40 °C for vertical installation .
Q10: What should I verify before ordering?
Always verify the exact part number (6GK7343-1EX21-0XE0), confirm your S7-300 CPU compatibility, check the firmware version of the specific unit, and consider whether the successor 6GK7343-1EX30-0XE0 would provide better long-term availability.
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