Industrial Ethernet Solution – Siemens 6GK7343-1EX21-0XE0 | CP 343-1 EX21 | SIMATIC NET S7-300
Where This Product Is Used
The Siemens 6GK7343-1EX21-0XE0 (CP 343-1 EX21) is a dedicated Ethernet communications processor designed for the SIMATIC S7-300 PLC platform. It is widely deployed across demanding industrial environments where reliable, high-speed data exchange between controllers, SCADA systems, and enterprise networks is critical:
- Automotive Manufacturing: Body-in-white welding lines, paint shop conveyors, and final assembly stations requiring deterministic Ethernet communication between S7-300 controllers and MES/SCADA layers.
- Chemical & Petrochemical Plants: Distributed control architectures where S7-300 PLCs must exchange process data with DCS historian servers over Industrial Ethernet.
- Water & Wastewater Treatment: Remote pump station monitoring and SCADA integration via TCP/IP over fiber or copper Ethernet backbones.
- Food & Beverage Processing: Hygienic production lines with centralized OPC-based supervisory control requiring ISO-on-TCP communication.
- Power Generation & Utilities: Substation automation and energy management systems integrating S7-300 controllers into plant-wide Ethernet networks.
- Machine Tool & Packaging OEM: Standalone machine cells communicating order and recipe data to factory ERP systems via UDP/TCP sockets.
Technical Specifications
| Part Number (SKU) | 6GK7343-1EX21-0XE0 |
| Product Family | SIMATIC NET CP 343-1 EX21 |
| Compatible PLC | SIMATIC S7-300 |
| Network Interface | Industrial Ethernet (10/100 Mbit/s), RJ45 |
| Supported Protocols | TCP/IP, ISO-on-TCP (RFC 1006), UDP, ICMP, SNMP, DHCP, NTP |
| S7 Communication | S7 routing, S7 connections (client/server) |
| Open Communication | SEND/RECEIVE via TCP, ISO-on-TCP, UDP |
| Max. Connections | 16 configurable connections |
| Configuration Tool | STEP 7 / SIMATIC Manager (NCM S7) |
| Power Supply | Via S7-300 backplane bus (5 VDC) |
| Operating Temperature | 0 °C to +60 °C |
| Storage Temperature | -40 °C to +70 °C |
| Degree of Protection | IP20 |
| Weight | approx. 340 g |
| Dimensions (W×H×D) | 40 × 125 × 120 mm |
| Certifications | CE, UL, cUL, FM, ATEX (Zone 2) |
Why Engineers Specify This Model
- Proven S7-300 Integration: Native backplane mounting with zero external power wiring; configured entirely within STEP 7 NCM S7 — no additional software license required.
- Protocol Flexibility: Simultaneous TCP/IP, ISO-on-TCP, and UDP connections allow a single CP to serve SCADA, OPC servers, and peer PLCs concurrently.
- S7 Routing Capability: Enables cross-network S7 routing between Industrial Ethernet and MPI/PROFIBUS segments, simplifying multi-network architectures.
- Robust Industrial Design: Rated for 0–60 °C continuous operation with ATEX Zone 2 approval for use in potentially explosive atmospheres.
- Long Field Track Record: The CP 343-1 EX21 generation has accumulated millions of operating hours in global process and discrete manufacturing installations.
Complete System Bill of Materials
For a fully operational S7-300 Ethernet communication node, the following components are typically required alongside the 6GK7343-1EX21-0XE0:
- SIMATIC S7-300 CPU (e.g., 6ES7315-2EH14-0AB0 CPU 315-2 PN/DP)
- S7-300 DIN Rail & Mounting Hardware (6ES7390-1AE80-0AA0)
- PS 307 Power Supply Module (e.g., 6ES7307-1EA01-0AA0, 5 A)
- Industrial Ethernet Switch (e.g., Siemens SCALANCE X005 or X208)
- IE FC RJ45 Plug 180 (6GK1901-1BB10-2AA0) – field-assembly RJ45 connector
- IE FC TP Standard Cable GP 2×2 (6XV1840-2AH10) – Industrial Ethernet cable
- STEP 7 V5.x / TIA Portal with NCM S7 for configuration
Compliance & Industry Standards
- CE Marking – EU Low Voltage and EMC Directives
- UL / cUL Listed – UL 508 Industrial Control Equipment
- FM Approved – Class I, Division 2, Groups A–D
- ATEX II 3 G – Zone 2 explosive atmosphere approval
- IEC 61131-2 – Programmable controllers: equipment requirements and tests
- IEEE 802.3 – Ethernet standard compliance
- RFC 1006 – ISO transport services on TCP/IP
Quality Assurance & Sourcing
Every Siemens 6GK7343-1EX21-0XE0 unit offered through Konmask.com undergoes the following verification process before dispatch:
- Visual inspection of housing, label, and firmware version sticker against Siemens OEM specifications
- Functional power-on test confirming LED status and backplane communication
- Traceability documentation: batch code, date code, and supplier chain records retained on file
- Anti-static packaging with humidity indicator card for safe international transit
- 30-day return window for DOA (Dead on Arrival) units with full replacement or refund
How to Source This Part
- Add to Cart – Select quantity and proceed to checkout directly on this page.
- Request a Quote – For orders of 5+ units or project BOM pricing, email support@konmask.com with your project details.
- Lead Time – In-stock units ship within 1–3 business days. Ex-stock availability confirmed at time of order.
- Export & Customs – We handle HS code documentation (HS 8537.10) and commercial invoices for cross-border shipments.
- Technical Pre-Sales Support – Our engineering team can advise on compatibility, firmware versions, and STEP 7 configuration before purchase.
Application-Specific FAQ
Q: Is the 6GK7343-1EX21-0XE0 compatible with TIA Portal?
A: The CP 343-1 EX21 is primarily configured via STEP 7 V5.x (NCM S7). Limited TIA Portal support is available; for full TIA Portal integration, consider the CP 343-1 Advanced (6GK7343-1GX31-0XE0).
Q: Can this CP support PROFINET IO controller/device roles?
A: No. The CP 343-1 EX21 supports Industrial Ethernet (TCP/IP, ISO-on-TCP, UDP, S7 communication) but does not implement PROFINET IO. For PROFINET IO, use a CPU with integrated PN interface or the CP 343-1 Advanced.
Q: How many simultaneous connections can be configured?
A: Up to 16 configurable connections, which can be a mix of S7, TCP, ISO-on-TCP, and UDP connections as defined in NCM S7.
Q: What is the difference between 6GK7343-1EX21-0XE0 and 6GK7343-1EX30-0XE0?
A: The EX30 variant is a later hardware revision with enhanced diagnostics and extended temperature options. Both are functionally compatible for standard Ethernet communication tasks on S7-300.
Q: Can this module operate in a hazardous area?
A: Yes, with ATEX II 3 G approval, the CP 343-1 EX21 is suitable for Zone 2 potentially explosive atmospheres when installed per Siemens installation guidelines.
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