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6GK7343-1EX21-0XE0

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For an S7-300 station, Siemens 6GK7343-1EX21-0XE0 is a CP 343-1 communication processor that links the PLC backplane to Industrial Ethernet and PROFINET services.
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Technical specifications for 6GK7343-1EX21-0XE0

  • Manufacturer:
    Siemens
  • Part Number:
    6GK7343-1EX21-0XE0
  • Product Family:
    Siemens Simatic S7-300
  • Product Type:
    Industrial Ethernet Communication Processor
  • Stock:
    1
  • Ethernet interface:
    One RJ45 port
  • Transmission rate:
    10/100 Mbit/s
  • PROFINET role:
    IO controller
  • S7 communication:
    Client and server services
  • Open communication:
    ISO, ISO-on-TCP, TCP, and UDP
  • S5-compatible services:
    SEND/RECEIVE and FETCH/WRITE
  • Network management:
    SNMP v1
  • Time synchronization:
    SIMATIC or NTP mode
  • Configuration:
    STEP 7 with NCM S7 for Ethernet
  • Configuration memory:
    C-PLUG
  • Supply voltage:
    24 V DC ±5%
  • Backplane current:
    200 mA typical
  • External current:
    200 mA maximum
  • Power loss:
    Approximately 5.8 W
  • Permitted rack slots:
    Slots 4–11 in racks 0–3
  • Operating temperature:
    0 to 60 °C
  • Weight:
    1.3228 lbs (0.6 kg)
  • Estimated shipping dimensions:
    8x12.5x12cm
  • Tariff Code:
    85176200
  • Country of origin:
    Germany
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Communication Services PROFINET IO Installation Path Configuration and Time

Features:

  • One 10/100 Mbit/s Industrial Ethernet RJ45 interface
  • PROFINET IO controller and S7 communication services
  • ISO, TCP, UDP, SEND/RECEIVE, and FETCH/WRITE paths
Siemens 6GK7343-1EX21-0XE0 places Industrial Ethernet communication beside the S7-300 CPU on the station backplane.

Its protocol stack separates PROFINET IO, S7 communication, and open TCP or UDP data exchange into the configured connection types.

A C-PLUG, mode LEDs, and STEP 7 diagnostics preserve configuration and expose faults independently of normal cyclic controller processing.

The Siemens 6GK7343-1EX21-0XE0 Industrial Ethernet Communication Processor may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Siemens 6GK7343-1EX21-0XE0 Industrial Ethernet Communication Processor Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.

How protocols divide the data paths

  • S7 services: 6GK7343-1EX21-0XE0 handles PG/OP traffic and configured S7 client or server connections.
  • Open communication: ISO transport, ISO-on-TCP, TCP, and UDP connections carry user-defined data through communication blocks.
  • S5-compatible path: SEND/RECEIVE and FETCH/WRITE preserve the specified S5-style data exchange methods.
  • Management queries: SNMP v1 exposes standard network information without replacing STEP 7 communication diagnostics.

Controller access to distributed Ethernet I/O

  • IO controller: 6GK7343-1EX21-0XE0 exchanges cyclic data with configured PROFINET IO devices.
  • User program: PNIO communication blocks transfer the IO data between the processor and the S7 user program.
  • Shared Ethernet: PROFINET IO can operate beside other configured communication services on the same RJ45 interface.
  • Access protection: Configured IP access control is evaluated above the Ethernet visibility needed for PROFINET IO operation.

From S7 rack to plant Ethernet

  • Rack position: The processor fits slots 4–11 in racks 0–3 connected through IM 360/361.
  • Backplane link: The enclosed bus connector carries data between 6GK7343-1EX21-0XE0 and the S7-300 station.
  • Common supply: CPU, communication processor, and interface module share the same 24 V DC supply arrangement.
  • Ethernet attachment: The RJ45 port connects the completed station to the Industrial Ethernet network after rack wiring is finished.

Project data, addressing, and clock transfer

  • Engineering route: STEP 7 with NCM S7 configures 6GK7343-1EX21-0XE0 through MPI or Industrial Ethernet.
  • Address assignment: The factory MAC address provides the initial route for assigning IP parameters to the processor.
  • Stored project: A C-PLUG keeps communication configuration available independently of the module electronics.
  • Clock modes: SIMATIC frames or NTP queries synchronize the processor, which then updates the CPU time at defined intervals.
Description
Installed beside the controller CPU, Siemens 6GK7343-1EX21-0XE0 is a CP 343-1 Industrial Ethernet communication processor for SIMATIC S7-300 and C7-300 stations. It connects the backplane to a 10/100 Mbit/s Ethernet network without turning the CPU interface into the plant Ethernet port.

Through its RJ45 connection, 6GK7343-1EX21-0XE0 can exchange S7 and PG/OP data, act as a PROFINET IO controller, and run ISO transport, ISO-on-TCP, TCP, or UDP connections. SEND/RECEIVE and FETCH/WRITE services provide the S5-compatible path for applications that use those communication blocks.

Installed in S7-300 rack slots 4 through 11, 6GK7343-1EX21-0XE0 connects to the backplane with the enclosed bus connector and shares the station power source with the CPU and interface module. Project data can be downloaded through MPI or Industrial Ethernet after the MAC and IP parameters are assigned.

The C-PLUG of 6GK7343-1EX21-0XE0 retains configuration separately from the processor hardware, while LEDs and STEP 7 diagnostics expose operating mode and communication faults. SIMATIC or NTP time synchronization lets the processor transfer a network time reference to the CPU on a controlled schedule.
Alternative Names
6GK73431EX210XE0 6GK 7343 1EX21 0XE0 6GK7343 1EX21 0XE0 Siemens 6GK7343-1EX21-0XE0 6GK7343-1EX21-0XE0 CP 343-1 Siemens CP 343-1 1EX21 6GK7343-IEX21-0XE0 6GK7343-1EX2I-0XE0
Technical notes
Siemens 6GK7343-1EX21-0XE0 combines one 10/100 Mbit/s RJ45 interface with S7, PROFINET IO, ISO-on-TCP, TCP, UDP, and FETCH/WRITE communication services.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
Where can 6GK7343-1EX21-0XE0 be installed in an S7-300 station?
Install Siemens 6GK7343-1EX21-0XE0 in slots 4 through 11 of racks 0 to 3 connected with IM 360/361; it is not approved behind an IM 365 extension.
Does 6GK7343-1EX21-0XE0 act as a PROFINET IO controller or device?
Siemens 6GK7343-1EX21-0XE0 provides the PROFINET IO controller role and exchanges IO data with configured Ethernet devices through the PNIO blocks.
Which path can be used for the first IP assignment on 6GK7343-1EX21-0XE0?
Use the factory-set MAC address to reach Siemens 6GK7343-1EX21-0XE0 for initial IP assignment before relying on the configured IP connection.
Why is the C-PLUG relevant when changing 6GK7343-1EX21-0XE0 hardware?
The C-PLUG holds the communication configuration of Siemens 6GK7343-1EX21-0XE0 separately, so the project data is not limited to the processor electronics.
Can 6GK7343-1EX21-0XE0 carry S5-style communication over Ethernet?
Yes. Siemens 6GK7343-1EX21-0XE0 provides SEND/RECEIVE plus FETCH/WRITE over the supported ISO, ISO-on-TCP, or TCP connection types.