Siemens A5E00430139 CP 343-1 – Industrial Ethernet Communication Processor | SIMATIC S7-300 Platform
Engineering Background
The Siemens A5E00430139 is the OEM part number for the CP 343-1 Communication Processor, a dedicated Ethernet interface module engineered for the SIMATIC S7-300 programmable logic controller platform. Designed to meet the rigorous demands of industrial automation environments, this module enables high-speed, deterministic data exchange between S7-300 CPUs and Ethernet-based control networks — without burdening the CPU’s processing resources.
Product Positioning
The CP 343-1 (A5E00430139) is the preferred communication solution for process engineers and system integrators who require reliable, standards-compliant Industrial Ethernet connectivity in distributed control architectures. It supports S7 communication, FETCH/WRITE protocols, and open TCP/IP communication, making it compatible with a broad ecosystem of SCADA systems, HMIs, and third-party controllers.
Complete Technical Specifications
| OEM Part Number | A5E00430139 |
| Module Designation | CP 343-1 |
| Compatible Platform | SIMATIC S7-300 |
| Communication Standard | Industrial Ethernet (IEEE 802.3) |
| Transmission Rate | 10/100 Mbit/s (auto-sensing) |
| Interface | RJ45 (8-pin) |
| Supported Protocols | S7 Communication, FETCH/WRITE, TCP/IP (RFC 1006), ISO Transport, UDP |
| Max. Connections | 16 simultaneous connections |
| Supply Voltage | DC 5 V (via S7-300 backplane bus) |
| Power Consumption | ≤ 1.5 W (typical) |
| Operating Temperature | 0 °C to +60 °C |
| Storage Temperature | -40 °C to +70 °C |
| Relative Humidity | 10% to 95% (non-condensing) |
| Protection Class | IP20 |
| Dimensions (W×H×D) | 40 mm × 125 mm × 120 mm |
| Weight | Approx. 600 g |
| Mounting | S7-300 DIN rail (standard profile rail) |
| Configuration Tool | STEP 7 / TIA Portal (NCM S7) |
| Firmware Upgradeable | Yes (via STEP 7) |
| Country of Origin | Germany |
| Certifications | CE, UL, cUL, FM, ATEX (zone 2) |
Proven Application Environments
- Discrete Manufacturing: Machine tool control, assembly line automation, and robotic cell integration via Ethernet backbone.
- Process Industries: Chemical, pharmaceutical, and food & beverage plants requiring deterministic Ethernet communication between PLCs and DCS/SCADA layers.
- Energy & Utilities: Substation automation and power distribution monitoring with TCP/IP-based data acquisition.
- Building Automation: HVAC, access control, and facility management systems integrated into S7-300 control networks.
- Water & Wastewater: Remote pump station monitoring and control over Industrial Ethernet infrastructure.
- Automotive: Body shop and paint shop automation with high-cycle, low-latency Ethernet communication requirements.
Engineering Advantages
- CPU Offload Architecture: Handles all Ethernet communication tasks independently, freeing the S7-300 CPU for real-time control execution.
- Protocol Flexibility: Supports both Siemens-native S7 protocol and open standards (TCP/IP, UDP, ISO), enabling seamless third-party integration.
- Auto-Negotiation: 10/100 Mbit/s auto-sensing eliminates manual speed configuration and ensures compatibility with legacy and modern network infrastructure.
- Robust Industrial Design: Conformal-coated PCB, wide temperature range, and IP20 enclosure rated for continuous operation in harsh industrial environments.
- STEP 7 / TIA Portal Integration: Native configuration via NCM S7 within the standard Siemens engineering workflow — no additional software license required.
- Scalable Connectivity: Up to 16 simultaneous connections support complex multi-node architectures without additional hardware.
System Architecture & Signal Flow
The CP 343-1 (A5E00430139) slots directly into the S7-300 rack via the backplane bus connector, occupying one module slot. Communication data is exchanged between the CP and the S7-300 CPU through the internal backplane bus at high speed. On the network side, the RJ45 port connects to standard Industrial Ethernet switches (e.g., Siemens SCALANCE X series) or directly to HMI/SCADA servers. The module operates as an autonomous communication co-processor: the CPU writes data to shared memory areas, and the CP handles all Ethernet framing, protocol encapsulation, and transmission independently. This architecture guarantees deterministic CPU scan times regardless of network load.
Sourcing & Quality Verification
- All units sourced through authorized Siemens distribution channels or verified surplus with full traceability documentation.
- Each module undergoes functional power-on testing and visual inspection prior to shipment.
- OEM part number A5E00430139 verified against Siemens MLFB catalog for authenticity.
- Packaging integrity checked; original Siemens anti-static packaging preserved where available.
- Certificate of conformity and test report available upon request for regulated industries.
Procurement Process
- Confirm Compatibility: Verify your S7-300 rack firmware version and STEP 7 / TIA Portal version supports CP 343-1 (A5E00430139). Refer to Siemens compatibility matrix (Entry ID: 18234930).
- Request Quote: Contact support@konmask.com for volume pricing, lead time confirmation, and export documentation.
- Place Order: Add to cart and complete checkout, or submit a purchase order via email for NET terms (qualified accounts).
- Shipping: Ships within 1–3 business days. DHL Express, FedEx International Priority, and sea freight options available. Export-controlled shipments handled with full EX1/EEI documentation.
- Incoming Inspection: Recommended: verify part number label, inspect connector pins, and perform bench power-on test before rack installation.
Technical FAQ
Q: Is A5E00430139 the same as 6GK7 343-1EX30-0XE0?
A: A5E00430139 is the OEM/spare part number. The MLFB (ordering number) for the CP 343-1 EX30 variant is 6GK7 343-1EX30-0XE0. Always cross-reference both numbers when ordering to confirm the exact hardware revision.
Q: Can this module communicate with non-Siemens PLCs?
A: Yes. Via open TCP/IP (RFC 1006) and UDP protocols, the CP 343-1 can exchange data with any Ethernet-capable device, including Allen-Bradley, Mitsubishi, Omron, and third-party SCADA/DCS systems.
Q: Does it support PROFINET?
A: No. The CP 343-1 (A5E00430139) supports Industrial Ethernet with S7/TCP/ISO protocols. For PROFINET IO, the correct module is the CP 343-1 Advanced (6GK7 343-1GX31-0XE0).
Q: What STEP 7 version is required for configuration?
A: STEP 7 V5.4 SP4 or higher is recommended. TIA Portal V13 SP1 and above also support this module via the NCM S7 configuration tool.
Q: Is a warranty provided?
A: Konmask.com provides a 90-day functional warranty on all tested units. Extended warranty and on-site support contracts available — contact us for details.
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