Description
The Siemens 6GK7343-1CX10-0XE0 is a Communications Processor (CP) for the SIMATIC S7-300 PLC, adding an independent 10/100 Mbps Ethernet (TCP/IP, ISO-on-TCP, UDP, PROFINET-IO Controller option on some FW, mainly S7 communication & Open User Communication on CP 343-1) interface to the S7-300 rack. It allows the S7-300 CPU to:
- Communicate with other SIMATIC stations (S7-400/1200/1500) via S7 Protocol (PUT/GET, BSEND/BRCV) over Industrial Ethernet.
- Act as an OPC Server target (via SIMATIC NET OPC — PC Station with CP 1613/1623 or softnet + CP 343-1).
- Exchange data with PCs / HMI / SCADA via Open User Communication (T-block: TCON, TSEND, TRCV — available in STEP 7 from certain FW versions).
- Support PROFINET IO Controller function (on CP 343-1 Advanced / -IT — standard CX10 is primarily for PG/OP/S7 comms & Open Com; Advanced = 6GK7343-1GX20-0XE0 adds full PN-IO Ctrl & Web/IT functions).
- Connect to office LAN or MES via TCP/IP — can route via gateway if configured.
The CP has its own processor, offloading communication tasks from the S7-300 CPU — essential for data-heavy Ethernet traffic or when multiple PG/OP connections are needed (CP supports multiple simultaneous connections — typical 16 S7 + 16 PG/OP depending on FW).
Key Features
- Interface: 1 × RJ45 10/100 Mbps Auto-MDIX (IEEE 802.3)
- Protocols: ISO (RFC 1006), TCP/IP (incl. UDP), S7 Communication, Open User Communication (T-blocks — FW dependent, V2.0+ typically), DHCP/BOOTP client (assign IP via network)
- S7 Connections: Up to 16 S7 connections + multiple PG/OP (total connections depend on CP FW — typically 16 S7 + 16 PG/OP = 32 total)
- Compatibility: Fits any S7-300 rack slot (after CPU + PS in slot 1 & 2/3) — configured in STEP 7 (HW Config)
- Initialization: IP, Subnet Mask, Gateway set via STEP 7 HW Config or via onboard DIP-less — stored in CP non-volatile memory; can also be assigned via BOOTP/DHCP
- Country of Origin: Germany / Hungary / China (Siemens Global)
Model & Variant Reference (S7-300 CP 343-1 Family)
Model | Ethernet Features | Best For |
|---|---|---|
6GK7343-1CX10-0XE0 (listed) | Standard — S7 comms, Open User Comm (T-block), PG/OP, ISO-on-TCP, Web basic (no PN-IO Ctrl) | Most S7-300 Ethernet needs — PG access, S7 data exch., SCADA via OPC |
6GK7343-1GX20-0XE0 | Advanced — adds PROFINET IO Controller + IT functions (Web server, email, SNMP, FTP) | Need PN-IO field devices (drives, I/O) controlled by S7-300 + IT diagnostics |
6GK7343-1EX20-0XE0 | CP 343-1 Lean (fewer connections — cheaper) — S7 + PG/OP only, no Open User Comm | Cost-sensitive — only PG download & basic S7 links needed |
⚠️ Important Selection Notes:
Technical Specifications (6GK7343-1CX10-0XE0 — CP 343-1 Standard)
Parameter | Specification |
|---|---|
Model / Order Code | 6GK7343-1CX10-0XE0 (Siemens SIMATIC S7-300 CP 343-1 Communications Processor) |
Function | Industrial Ethernet Communications Processor for S7-300 |
Ethernet Interface | 1 × RJ45, 10/100 Mbps (Auto-negotiation, Auto-MDIX) — IEEE 802.3 |
Supported Protocols | ISO (RFC 1006), TCP/IP (incl. UDP), S7 (S7-300/400/1200/1500), Open User Comm. (T-blocks), DHCP/BOOTP client |
S7 Connections (max.) | Up to 16 S7 connections (simultaneous) + up to 16 PG/OP connections (total connections typ. 32 — FW dep.) |
PROFINET IO Capability | ❌ No (Standard version — for PN-IO Ctrl → need 6GK7343-1GX20-0XE0 Advanced) |
IT Functions (Web/Email/FTP) | ❌ No (Advanced version has it) |
Configuration Method | STEP 7 HW Config (insert CP → set IP, Subnet, GW, connections) — stored in CP NVM |
Backplane Current Draw (5V) | ~ 200 mA (typical — check against S7-300 PS capacity) |
Mounting | S7-300 rack — any I/O slot (slot 3–4 typically after CPU in slot 2) |
Dimensions (W×H×D) | 40 mm × 125 mm × 120 mm (standard S7-300 module width — 2 TE) |
Weight | ~ 0.3 kg |
Operating Temp. | 0 … +60 °C |
Standards | CE, UL, cUL, FM (Cls I Div 2), RoHS, EN 61131-2 |
Warranty & After-Sales
- Factory new units: 12 months warranty
- Refurbished units: 3-6 months warranty (link test — PING + S7 PG/OP connection test with STEP 7)
- Technical support for:
- STEP 7 HW Config (insert CP, assign IP/Subnet/GW, create S7 connections / Open User Comm T-blocks)
- Initial IP setup via PST (Primary Setup Tool) or BOOTP if no STEP 7 project yet
- Connection troubleshooting (PING test, checking PG/PC interface setting “S7ONLINE → CP_L2_1 / TCPIP(CP 343-1)”)
- Cross-ref to CP 343-1 Advanced (6GK7343-1GX20) if PN-IO Controller or Web server needed
- Migration note: If moving from CP 343-1 to S7-1200/1500 built-in PN — built-in port can do S7 comms + PN-IO device/controller directly
- Spare screws & grounding strap (if required by EMC) available
Delivery Time
- Standard delivery: 3-5 working days (stock items)
- Express shipping available upon request
Why Choose Our Store
- Genuine Siemens SIMATIC CP 343-1 — not clone MAC/PHY issues
- Global supply network with competitive pricing
- Expertise in S7-300 Ethernet configuration (S7 comms, OUC T-blocks, IP assignment)
- Comprehensive technical documentation (HW insert screenshot, IP config step-by-step, PING test guide)
- Responsive customer service and support
Applications
- PG/OP Access: Download/monitor S7-300 program via Ethernet instead of MPI — faster & remote.
- S7 Data Exchange: Share DB data between S7-300 and S7-400/1200/1500 via S7 PUT/GET over Ethernet.
- SCADA / MES Link: OPC Server (SIMATIC NET) polls S7-300 tags via CP 343-1 — no MPI card needed on PC.
- Open User Comm (T-blocks): Send/receive raw TCP/UDP packets to non-Siemens devices (printers, barcode scanners, 3rd-party controllers with socket API).
- Retrofit / Spare: Add Ethernet to existing S7-300 panel — plug into empty I/O slot, configure in HW Config, download.
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