Siemens 6GK7343-1EX21-0XE0 CP 343-1 Communication Processor

6GK7343-1EX21-0XE0 SIEMENS

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Specification

Trade Process

Recommended Models & Related Products

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.

What's Included

• 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 .

Why Buy From Us?

• 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

Frequently Asked Questions (FAQ)

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.