Siemens 6GK7343-1EX20-0XE0 connects SIMATIC S7-300 controllers to Industrial Ethernet for S7, TCP, UDP, and ISO-on-TCP communications.
The Siemens 6GK7343-1EX20-0XE0 is the CP 343-1EX20 communications processor for connecting SIMATIC S7-300 and C7-300 systems to Industrial Ethernet. Siemens documents S7 communication, PG/OP functions, ISO-on-TCP, TCP and UDP services, multicast and FETCH/WRITE operation.
The module uses an 8-pin RJ45 twisted-pair port and a fixed factory MAC address. Hardware product version 1 is documented with firmware V1.0 and V1.1; firmware V1.1 adds SNMP V1 support and selectable S7 or S5 addressing for FETCH/WRITE. STEP 7 V5.2 or higher is required to configure the EX20 version.
| Official Siemens designation | CP 343-1EX20 |
|---|---|
| Hardware product version | Version 1 |
| Documented firmware | V1.0 and V1.1 |
| Reference documentation | Siemens CP 343-1 / CP 343-1EX20 manual, release 02/2003 |
| Manufacturer | Siemens |
|---|---|
| Product range | SIMATIC NET |
| Product type | Industrial Ethernet communications processor |
| Target system | SIMATIC S7-300 / C7-300 |
| LAN interface | 8-pin RJ45 twisted-pair port |
| Ethernet services | S7, ISO-on-TCP, TCP and UDP |
| Additional services | PG/OP, FETCH/WRITE, SEND/RECEIVE and multicast |
| Maximum simultaneous Ethernet connections | 48 |
| SEND/RECEIVE connection total | Maximum 16 |
| S7 data record length | 240 bytes per PDU |
| TCP / ISO-on-TCP data length | 1 to 8192 bytes |
| UDP data length | 1 to 2048 bytes |
| SNMP | SNMP V1 with firmware V1.1 or higher |
| Configuration software | STEP 7 V5.2 or higher for CP 343-1EX20 |
Use current photographs to verify the exact article identity, interfaces and physical condition before procurement approval.
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| Application | Engineering Relevance |
|---|---|
| S7-300 Industrial Ethernet connection | Adds Ethernet communication services to a SIMATIC S7-300 station. |
| PLC-to-PLC data exchange | Supports configured S7 connections and SEND/RECEIVE services. |
| HMI and engineering access | Provides PG/OP communication and diagnostic access over the network. |
| TCP/UDP integration | Connects controller data to devices using ISO-on-TCP, TCP, UDP and multicast services. |
Siemens documents the CP 343-1EX20 generation in its exact product manual with hardware version 1 and firmware V1.0/V1.1. Lifecycle procurement must preserve the configured CP type, firmware-dependent functions and project block versions; no substitute should be approved solely by connector appearance.
It is a CP 343-1EX20 communication processor for connecting S7-300 or C7-300 to Industrial Ethernet.
The Siemens manual documents S7 communication, ISO-on-TCP, TCP, UDP, multicast and FETCH/WRITE services.
The EX20 version provides an 8-pin RJ45 twisted-pair Ethernet port.
Siemens specifies a maximum total of 48 simultaneous Industrial Ethernet connections.
STEP 7 V5.2 or higher is required to configure the CP 343-1EX20.
Verify the exact CP type, firmware, RJ45 network, project configuration and communication block versions.
Send the exact part number, quantity, destination and required condition for availability, compatibility and warranty review.
Structured support for exact-part identification, compatibility review, condition evidence, packing and international delivery.
Exact Identity ReviewWe compare the complete 6GK7343-1EX20-0XE0 code, nameplate, housing and installed connections before quotation. |
Condition EvidenceAvailable units may be documented with readable label, connector, terminal, enclosure and packaging photographs. |
Packing and DeliveryProtective packing, shipping documentation and trackable worldwide delivery options are coordinated. |
| Service Stage | What We Review | Customer Value |
|---|---|---|
| Part-number verification | Manufacturer, complete suffix and label identity | Reduces the risk of receiving a similar but incompatible variant |
| Technical configuration | Target system, LAN interface, Ethernet services, Additional services | Supports a more accurate match to the installed system |
| Compatibility review | Interfaces, wiring, software or mechanical fit | Highlights integration checks before installation |
| Condition confirmation | Label, terminals, enclosure and packaging | Provides visible evidence for purchasing approval |
| Commercial review | Quantity, condition, lead time and destination | Clarifies written offer terms before ordering |
| Dispatch support | Final check, packing, documents and tracking | Supports traceable international delivery |
| 01 Requirement | 02 Technical Check | 03 Written Offer | 04 Inspection | 05 Dispatch |
|---|---|---|---|---|
| Part number, quantity and destination | Configuration and system fit | Condition, lead time and terms | Photo and physical review | Packing, documents and tracking |
The module uses an 8-pin RJ45 twisted-pair port and a fixed factory MAC address. Hardware product version 1 is documented with firmware V1.0 and V1.1; firmware V1.1 adds SNMP V1 support and selectable S7 or S5 addressing for FETCH/WRITE. STEP 7 V5.2 or higher is required to configure the EX20 version.
Final selection and engineering approval remain the responsibility of the plant, machine builder or system integrator. Written order terms should identify the full model, condition, quantity and any revision requirement.
| Pre-shipment evidence | Available label, unit-condition and packaging photographs can be supplied for review. |
|---|---|
| Packing | Industrial components are protected against impact, contamination and movement during transit. |
| Worldwide shipping | Carrier and routing options are reviewed against the destination and applicable trade restrictions. |
| Warranty | Eligible products carry a 12-month limited warranty unless different written terms are agreed. |
| After-sales communication | Keep the order reference, label photographs and fault description available for any support request. |
Send the exact part number, quantity, destination and required condition for availability, compatibility and warranty review.
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Send the exact part number, quantity, destination and required condition for availability, compatibility and warranty review.
