SIEMENS 6GK7343-1EX20-0XE0 CP 343-1 EX20 – Industrial Ethernet Communication Processor | S7-300 Platform
Engineering Background
The SIEMENS 6GK7343-1EX20-0XE0 — commercially designated CP 343-1 EX20 — is a dedicated Industrial Ethernet communication processor engineered for the SIMATIC S7-300 programmable logic controller platform. Developed under Siemens’ SIMATIC NET architecture, this module enables high-speed, deterministic data exchange between S7-300 CPUs and Ethernet-based supervisory, SCADA, and peer-to-peer networks. It is the preferred connectivity solution for engineers who require reliable ISO transport, TCP/IP, and UDP communication without burdening the CPU’s processing cycle.
Product Positioning
Designed for demanding industrial environments — automotive assembly, process control, energy management, and discrete manufacturing — the CP 343-1 EX20 offloads all Ethernet communication tasks from the S7-300 CPU, ensuring deterministic scan times and uninterrupted process control. Its compact S7-300 rail-mount form factor and plug-and-play STEP 7 integration make it the benchmark communication module for legacy and active S7-300 installations worldwide.
Complete Technical Specifications
| Parameter | Value |
|---|---|
| Part Number / SKU | 6GK7343-1EX20-0XE0 |
| Commercial Designation | CP 343-1 EX20 |
| Manufacturer | Siemens AG |
| Product Family | SIMATIC NET / SIMATIC S7-300 |
| Module Type | Industrial Ethernet Communication Processor |
| Compatible Platform | SIMATIC S7-300 (all CPU variants) |
| Network Interface | 1 × RJ45, 10/100 Mbps Auto-Sensing |
| Supported Protocols | ISO Transport, TCP/IP (RFC 793), UDP (RFC 768), ICMP, SNMP V1 |
| Max. Connections | 16 configurable connections |
| Data Transfer Rate | 10 Mbps / 100 Mbps (auto-negotiation) |
| Supply Voltage | DC 5 V (via S7-300 backplane bus) |
| Power Consumption | Typ. 1.2 W |
| Operating Temperature | 0 °C … +60 °C |
| Storage Temperature | -40 °C … +70 °C |
| Relative Humidity | 10 % … 95 % (non-condensing) |
| Degree of Protection | IP20 |
| Dimensions (W × H × D) | 40 mm × 125 mm × 120 mm |
| Weight | Approx. 280 g (module only) |
| Mounting | S7-300 DIN Rail (35 mm) |
| Configuration Tool | STEP 7 V5.x / TIA Portal (via legacy support) |
| Certifications | CE, UL, cUL, FM, ATEX (Zone 2) |
| MTBF | > 300,000 hours |
Proven Application Environments
- Automotive Manufacturing: Body-in-white welding lines, paint shop conveyors, and final assembly stations requiring deterministic Ethernet communication between S7-300 PLCs and MES/SCADA systems.
- Process Industry: Chemical, pharmaceutical, and oil & gas plants where ISO transport connections provide reliable peer-to-peer data exchange between distributed S7-300 controllers.
- Energy & Utilities: Substation automation and power distribution panels integrating S7-300 PLCs with energy management systems via TCP/IP.
- Building Automation: HVAC, access control, and fire suppression systems using S7-300 as the primary controller with Ethernet-based supervisory networks.
- Machine Tool & OEM Equipment: CNC machining centers and packaging lines requiring high-speed data logging and remote diagnostics over Industrial Ethernet.
Engineering Advantages
- CPU Offload Architecture: All Ethernet protocol processing is handled independently by the CP 343-1 EX20, preserving S7-300 CPU scan time for process-critical tasks.
- Multi-Protocol Support: Simultaneous ISO, TCP, and UDP connections allow integration with legacy SIMATIC systems and modern IP-based infrastructure on a single module.
- 16 Parallel Connections: Supports up to 16 configurable connections — enabling concurrent SCADA polling, peer-to-peer exchange, and programming access without connection contention.
- Auto-Sensing Ethernet: 10/100 Mbps auto-negotiation eliminates manual speed configuration and ensures compatibility with both legacy 10BASE-T and modern 100BASE-TX networks.
- STEP 7 Native Integration: Full NetPro configuration within STEP 7 V5.x — no third-party tools required. Connection parameters, IP addressing, and protocol settings are managed within the familiar SIMATIC engineering environment.
- Industrial Robustness: Rated for 0–60 °C operation, IP20 protection, and ATEX Zone 2 compliance — suitable for harsh industrial and potentially explosive atmospheres.
System Architecture & Signal Flow
The CP 343-1 EX20 occupies a standard slot on the S7-300 rail and communicates with the CPU via the internal S7-300 backplane bus (K-bus). On the network side, the RJ45 port connects directly to an Industrial Ethernet switch or managed network infrastructure. The module autonomously manages all Ethernet frame handling, protocol stack processing, and connection management — presenting data to the CPU as organized data blocks (DBs) accessible via standard STEP 7 FC/FB communication blocks (AG_SEND / AG_RECV or TCON/TSEND/TRCV for TCP connections). This architecture ensures that network latency and protocol overhead are fully isolated from the deterministic PLC scan cycle.
Sourcing & Quality Verification
- Origin: Genuine Siemens AG manufactured product — sourced through authorized industrial distribution channels.
- Inspection: Every unit undergoes visual inspection, label authenticity verification, and functional power-on testing prior to shipment.
- Packaging: Ships in original or equivalent ESD-safe anti-static packaging with protective foam insert.
- Traceability: Batch and serial number documentation available upon request for quality-critical procurement.
- Warranty: 12-month replacement warranty against manufacturing defects.
Procurement Process
- Inquiry: Submit your RFQ via the product page or email [email protected] with quantity and required delivery date.
- Quotation: Receive a formal quotation with unit price, lead time, and shipping options within 24 business hours.
- Order Confirmation: Place order via the Konmask.com checkout or via purchase order (PO) for approved B2B accounts.
- Inspection & Dispatch: Unit inspected, documented, and dispatched with tracking within 1–3 business days.
- Delivery: DHL Express / FedEx International Priority — typical transit 3–7 business days worldwide.
- After-Sales: Technical support and warranty claims handled directly by Konmask engineering team.
Technical FAQ
Q: Is the 6GK7343-1EX20-0XE0 compatible with TIA Portal?
A: The CP 343-1 EX20 is natively configured in STEP 7 V5.x. Limited legacy support is available in TIA Portal via the STEP 7 Professional migration path, but full feature support requires STEP 7 Classic.
Q: Can this module support PROFINET IO?
A: No. The 6GK7343-1EX20-0XE0 supports ISO Transport, TCP/IP, and UDP — not PROFINET IO. For PROFINET IO on S7-300, refer to the CP 343-1 Advanced (6GK7343-1GX31-0XE0) or CP 343-1 PROFINET variants.
Q: How many S7 connections can be configured simultaneously?
A: Up to 16 connections can be configured, including S7 connections, ISO transport connections, TCP connections, and UDP connections — shared across the total pool.
Q: What is the maximum cable length for the RJ45 Ethernet port?
A: Per IEEE 802.3 standard, maximum segment length is 100 m for 100BASE-TX using Cat5e or better UTP/STP cable.
Q: Is a firmware update required for new units?
A: Units ship with factory-installed firmware. Firmware updates are available via Siemens Industry Online Support (SIOS) and can be applied using STEP 7 or the Primary Setup Tool (PST).
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