Siemens 6GK7343-1GX31-0XE0

CP 343-1 Advanced communications processor, gigabit and PROFINET

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Siemens SIMATIC NET CP 343-1 Advanced: communications processor connecting an S7-300 to Industrial Ethernet, with a gigabit port and a 2-port PROFINET interface, PROFINET IO controller or device, firewall and VPN.

Manufacturer: Siemens
Manufacturer part no.: 6GK7343-1GX31-0XE0
Product family: SIMATIC S7-300 PLC Modules
Type: Communications processor
Category: Industrial communication › Communication processors
Lifecycle: Discontinued
OEM successor: Not stated
Technical datasheet: Data sheet

Technical specifications

Manufacturer: Siemens
Manufacturer part no.: 6GK7343-1GX31-0XE0
Type: Communications processor
Application: Industrial Ethernet communications processor
Used with: SIMATIC S7-300 rack (S7-300 backplane bus)
transfer rate / at the 1st interface: 10 ... 1000 Mbit/s
transfer rate / at the 2nd interface: 10 ... 100 Mbit/s
number of interfaces / according to Industrial Ethernet: 3
number of electrical connections / at the 1st interface / according to Industrial Ethernet: 1
number of electrical connections / at the 2nd interface / according to Industrial Ethernet: 2
number of electrical connections / for power supply: 1
type of electrical connection / at the 1st interface / according to Industrial Ethernet: RJ45 port
type of electrical connection / at the 2nd interface / according to Industrial Ethernet: RJ45 port
type of electrical connection / for power supply: 2-pole plugable terminal block
design of the removable storage / C-PLUG: Yes
type of voltage / of the supply voltage: DC
supply voltage / 1 / from backplane bus: 5 V
supply voltage / external: 24 V
supply voltage / external / at DC / rated value: 24 V
supply voltage, current consumption, power loss / relative positive tolerance / at DC / at 24 V: 20 %
supply voltage, current consumption, power loss / relative negative tolerance / at DC / at 24 V: 15 %
consumed current / from backplane bus / at DC / at 5 V / typical: 0.14 A
consumed current / from external supply voltage / at DC / at 24 V / typical: 0.48 A
consumed current / from external supply voltage / at DC / at 24 V / maximum: 0.62 A
supply voltage, current consumption, power loss / power loss [W]: 14.7 W
ambient temperature / for vertical installation / during operation: 0 ... 40 °C
ambient temperature / for horizontally arranged busbars / during operation: 0 ... 60 °C
ambient temperature / during storage: -40 ... +70 °C
ambient temperature / during transport: -40 ... +70 °C
relative humidity / at 25 °C / without condensation / during operation / maximum: 95 %

Show all 146 specifications

ambient conditions / protection class IP: IP20
module format: Compact module
width: 80 mm
height: 125 mm
depth: 120 mm
net weight: 0.45 kg
fastening method / S7-300 rail mounting: Yes
performance data / open communication / number of possible connections / for open communication / by means of SEND/RECEIVE blocks / maximum: 16
data volume / as user data per ISO connection / for open communication / by means of SEND/RECEIVE blocks / maximum: 8 Kibyte
data volume / as user data per ISO on TCP connection / for open communication / by means of SEND/RECEIVE blocks / maximum: 8 Kibyte
data volume / as user data per TCP connection / for open communication / by means of SEND/RECEIVE blocks / maximum: 8 Kibyte
data volume / as user data per UDP connection / for open IE communication / by means of SEND/RECEIVE blocks / maximum: 2 Kibyte
performance data / open communication / number of Multicast stations: 16
number of possible connections / for S7 communication / maximum: 16
performance data / multi-protocol mode / number of active connections / with multi-protocol mode: 48
number of possible connections / as client / by means of FTP / maximum: 10
number of possible connections / as server / by means of FTP / maximum: 2
number of possible connections / as server / by means of HTTP / maximum: 4
number of possible connections / as email client / maximum: 1
performance data / IT functions / data volume / as user data for email / maximum: 8 Kibyte
storage capacity / of the user memory / as flash memory file system: 28 Mibyte
storage capacity / of the user memory / as RAM: 30 Mibyte
performance data / IT functions / number of possible write cycles / of the flash memory cells: 100000
performance data / PROFINET communication / as PN IO controller / product function / PROFINET IO controller: Yes
performance data / PROFINET communication / as PN IO controller / number of PN IO devices / on PROFINET IO controller / operable / total: 128
performance data / PROFINET communication / as PN IO controller / number of PN IO IRT devices / on PROFINET IO controller / operable: 128
performance data / PROFINET communication / as PN IO controller / number of external PN IO lines / with PROFINET / per rack: 1
data volume / as user data for input variables / as PROFINET IO controller / maximum: 4 Kibyte
data volume / as user data for output variables / as PROFINET IO controller / maximum: 4 Kibyte
data volume / as user data for input variables per PN IO device / as PROFINET IO controller / maximum: 1433 byte
data volume / as user data for output variables per PN IO device / as PROFINET IO controller / maximum: 1433 byte
data volume / as user data for input variables per PN IO device / for each sub-module as PROFINET IO controller / maximum: 240 byte
data volume / as user data for output variables per PN IO device / for each sub-module as PROFINET IO controller / maximum: 240 byte
performance data / PROFINET communication / as PN IO device / product function / PROFINET IO device: Yes
data volume / as user data for input variables / as PROFINET IO device / maximum: 1024 byte
data volume / as user data for output variables / as PROFINET IO device / maximum: 1024 byte
data volume / as user data for input variables / for each sub-module as PROFINET IO device: 240 byte
data volume / as user data for output variables / for each sub-module as PROFINET IO device: 240 byte
data volume / as user data for the consistency area for each sub- module: 240 byte
performance data / PROFINET communication / as PN IO device / number of submodules / per PROFINET IO-Device: 32
performance data / PROFINET CBA / number of remote connection partners / with PROFINET CBA: 64
performance data / PROFINET CBA / number of connections / with PROFINET CBA / total: 1000
data volume / as user data for digital inputs / with PROFINET CBA / maximum: 8 Kibyte
data volume / as user data for digital outputs / with PROFINET CBA / maximum: 8 Kibyte
data volume / as user data for arrays and data types / in the case of acyclic transmission / with PROFINET CBA / maximum: 8 Kibyte
data volume / as user data for arrays and data types / with PROFINET CBA / with cyclical transfer / maximum: 250 byte
data volume / as user data for arrays and data types / with PROFINET CBA / in the case of local interconnection / maximum: 2400 byte
performance data / PROFINET CBA / remote interconnection / with acyclic transfer / update time / of the remote interconnections / in the case of acyclic transmission / with PROFINET CBA: 100 ms
performance data / PROFINET CBA / remote interconnection / with acyclic transfer / number of remote connections to input variables / in the case of acyclic transmission / with PROFINET CBA / maximum: 128
performance data / PROFINET CBA / remote interconnection / with acyclic transfer / number of remote connections to output variables / in the case of acyclic transmission / with PROFINET CBA / maximum: 128
data volume / as user data for remote interconnections with input variables / in the case of acyclic transmission / with PROFINET CBA: 8 Kibyte
data volume / as user data for remote interconnections with output variables / in the case of acyclic transmission / with PROFINET CBA: 8 Kibyte
performance data / PROFINET CBA / remote interconnection / with cyclic transfer / update time / of the remote interconnections / with cyclical transfer / with PROFINET CBA: 8 ms
performance data / PROFINET CBA / remote interconnection / with cyclic transfer / number of remote connections to input variables / with PROFINET CBA / with cyclic transfer / maximum: 200
performance data / PROFINET CBA / remote interconnection / with cyclic transfer / number of remote connections to output variables / with cyclical transfer / with PROFINET CBA / maximum: 200
data volume / as user data for remote interconnections with input variables / with cyclical transfer / with PROFINET CBA / maximum: 2000 byte
data volume / as user data for remote interconnections with output variables / with cyclical transfer / with PROFINET CBA / maximum: 2000 byte
performance data / PROFINET CBA / HMI variables via PROFINET / acyclic / number of connectable HMI stations / for HMI variables / in the case of acyclic transmission / with PROFINET CBA: 3
performance data / PROFINET CBA / HMI variables via PROFINET / acyclic / update time / of the HMI variables / in the case of acyclic transmission / with PROFINET CBA: 500 ms
performance data / PROFINET CBA / HMI variables via PROFINET / acyclic / number of HMI variables / in the case of acyclic transmission / with PROFINET CBA / maximum: 200
performance data / PROFINET CBA / HMI variables via PROFINET / acyclic / data volume / as user data for HMI variables / in the case of acyclic transmission / with PROFINET CBA / maximum: 8 Kibyte
performance data / PROFINET CBA / device-internal interconnections / number of internal connections / with PROFINET CBA / maximum: 256
performance data / PROFINET CBA / device-internal interconnections / data volume / of the internal connections / with PROFINET CBA / maximum: 2400 byte
performance data / PROFINET CBA / interconnections to constants / number of connections with constants / with PROFINET CBA / maximum: 200
performance data / PROFINET CBA / interconnections to constants / data volume / as user data for interconnections with constants / with PROFINET CBA / maximum: 4096 byte
performance data / PROFINET CBA / PROFIBUS proxy functionality / product function / with PROFINET CBA / PROFIBUS proxy functionality: No
protocol / is supported / TCP/IP: Yes
product function / MIB support: Yes
protocol / is supported / SNMP v1: Yes
protocol / is supported / SNMP v3: Yes
protocol / is supported / DCP: Yes
protocol / is supported / LLDP: Yes
configuration software / required: STEP7 V5.5 SP2 HF1 or higher / STEP 7 Professional V12 (TIA Portal) or higher
configuration software / for PROFINET CBA / required: SIMATIC iMap V3.0 SP4 and higher
identification & maintenance function / I&M0 - device-specific information: Yes
identification & maintenance function / I&M1 - higher level designation/location designation: Yes
product function / is supported / identification link: Yes; acc. to IEC 61406-1:2022
product function / web-based diagnostics: Yes
product feature / switch: Yes
product function / switch-managed: No
product function / with IRT / PROFINET IO switch: Yes
product function / configuration with STEP 7: Yes
product function / ring redundancy: Yes
product function / redundancy manager: Yes
product functions / redundancy / protocol / is supported / Media Redundancy Protocol (MRP): Yes
product functions / security / firewall version: stateful inspection
product function / with VPN connection: IPSec
product functions / security / type of encryption algorithms / with VPN connection: AES-256, AES-192, AES-128, 3DES-168, DES-56
product functions / security / type of authentication procedure / with VPN connection: Preshared key (PSK), X.509v3 certificates
product functions / security / type of hashing algorithms / with VPN connection: MD5, SHA-1
product functions / security / number of possible connections / with VPN connection: 32
product function / password protection for Web applications: Yes
product function / ACL - IP-based: Yes
product function / ACL - IP-based for PLC/routing: Yes
product function / switch-off of non-required services: Yes
product function / blocking of communication via physical ports: Yes
product function / log file for unauthorized access: No
product function / SICLOCK support: Yes
product function / pass on time synchronization: Yes
protocol / is supported / NTP: Yes
standards, specifications, approvals / certificate of suitability / CE marking: Yes
standards, specifications, approvals / certificate of suitability / UKCA marking: Yes
standards, specifications, approvals / certificate of suitability / KC approval: Yes
standards, specifications, approvals / certificate of suitability / Regulatory Compliance Mark (RCM): Yes
standards, specifications, approvals / certificate of suitability / RoHS conformity: Yes
standards, specifications, approvals / certificate of suitability / EAC approval: Yes
standards, specifications, approvals / hazardous environments / header / certificate of suitability / ATEX: Yes
standards, specifications, approvals / hazardous environments / header / certificate of suitability / IECEx: Yes
standards, specifications, approvals / hazardous environments / header / certificate of suitability / ULhazloc approval: Yes
standards, specifications, approvals / hazardous environments / header / certificate of suitability / CCC / for hazardous zone according to GB standard: Yes
standards, specifications, approvals / hazardous environments / header / certificate of suitability / FM registration: Yes
standards, specifications, approvals / marine classification / header / Marine classification association / Polski Rejestr Statkow (PRS): Yes
General Product Approval / Declaration of Con-: China RoHS
Approvals / Certificates / Manufacturer Declara-: Miscellaneous
Manufacturer Declara- / proval / China RoHS: FM CCC-Ex
Approvals / Certificates / last modified:: 8/28/2026

Technical documents (1)

Siemens data sheet 6GK7343-1GX31-0XE0

Key features

1st interface: 1 RJ45 port, 10 to 1000 Mbit/s
2nd interface: 2 RJ45 ports, 10 to 100 Mbit/s, PROFINET IO controller and/or device
Firewall and VPN, FTP, e-mail, SNMP and DHCP (Siemens's description)
External 24 V DC supply; 80 mm wide
Discontinued by Siemens on 1 October 2025; spare part only

About the Siemens 6GK7343-1GX31-0XE0

The Siemens 6GK7343-1GX31-0XE0 is the Advanced version of the CP 343-1 (the standard one is the 6GK7343-1EX30-0XE0): Siemens's description lists a gigabit port and firewall/VPN security besides PROFINET IO. Siemens's data sheet gives a 10 to 1000 Mbit/s first interface, a 2-port 10 to 100 Mbit/s second interface, an external 24 V DC supply (0.48 A typical) and an 80 mm wide module. Siemens's data sheet marks it as a spare part.

What is the 6GK7343-1GX31-0XE0 used for?

It connects an S7-300 CPU to Industrial Ethernet and to PROFINET IO devices.

Lifecycle and successor

Discontinued.

Before you order

What to photograph or confirm so the right unit is quoted.

Check the order number and firmware version on the label, and keep a record of the CP's configuration (IP addresses, firewall rules) before replacing it.

Other parts in the Siemens SIMATIC S7-300 family

Listed for reference. They differ from the 6GK7343-1GX31-0XE0 in rating, supply, interface or function and are not interchangeable with it unless Siemens says so. Match the part number on your unit.

Product	Type	Lifecycle	Qty Available	Price	Action
Siemens 6GK7343-1CX10-0XE0CP 343-1 Lean communications processor, Industrial Ethernet	Communications processor	Discontinued	On Request	On request	View
Siemens 6GK7343-1EX30-0XE0CP 343-1 communications processor, Industrial Ethernet, PROFINET IO controller	Communications processor	Discontinued	On Request	On request	View
Siemens 6GK7342-5DA03-0XE0CP 342-5 communications processor, PROFIBUS DP master/slave	Communications processor	Discontinued	On Request	On request	View
Siemens 6ES7340-1AH02-0AE0CP 340 communications processor, RS 232C	Communications processor	Discontinued	On Request	On request	View
Siemens 6ES7338-4BC01-0AB0SM 338 position input module, 3 SSI encoders	Position input module	Discontinued	On Request	On request	View
Siemens 6ES7341-1CH02-0AE0CP 341 communications processor, RS 422/485	Communications processor	Discontinued	On Request	On request	View
Siemens 6ES7341-1AH02-0AE0CP 341 communications processor, RS 232C	Communications processor	Discontinued	On Request	On request	View
Siemens 6GK7343-2AH11-0XA0CP 343-2P AS-Interface master for S7-300 and ET 200M	Communications processor	Discontinued	On Request	On request	View
Siemens 6ES7351-1AH02-0AE0FM 351 positioning module for rapid/creep traverse drives	Positioning module	Discontinued	On Request	On request	View
Siemens 6ES7352-1AH02-0AE0FM 352 electronic cam controller, 13 cam tracks	Cam controller module	Discontinued	On Request	On request	View
Siemens 6ES7355-0VH10-0AE0FM 355 C controller module, 4 continuous control channels	Controller module	Discontinued	On Request	On request	View
Siemens 6AG1321-1BL00-2AA0SIPLUS SM 321 digital input, 32 DI, 24 V DC, conformal coating	Digital input module	Discontinued	On Request	On request	View

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