How to Select an Interface Relay for PLC Outputs
A step-by-step guide to matching PLC output type, coil voltage and current, contact rating, and socket style when selecting an interface relay.
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The Siemens CP 443-1 (6GK7443-1EX30-0XE0) is a communication processor that links a SIMATIC S7-400 CPU to Industrial Ethernet via an integrated 2-port switch, offering 10/100 Mbit/s over two RJ45 ports with PROFINET IO controller support for up to 128 IO devices. It also handles S7 communication, open communication (SEND/RECEIVE), S7 routing, and IP-based access control, drawing 5 V from the backplane bus at 1.4 A typical.
The 128-device PROFINET IO controller capacity and 64 IRT-capable devices make this the CP to choose over the CP 343-1 when the station needs a larger, isochronous-capable IO network on an S7-400 backplane rather than S7-300. Four external PROFINET IO lines per rack allow splitting that device count across separate physical lines for cable-length or segmentation reasons, and the ACL and port-blocking security functions isolate the Ethernet segment without extra hardware.
Connects S7-400 CPUs to Industrial Ethernet/PROFINET networks in larger machine and process control systems that need S7 routing between subnets, open communication with third-party Ethernet devices, and centralized time synchronization via NTP or SICLOCK.
| product type designation | CP 443-1 Communications processor CP 443-1; 2x 10/100 Mbit/s (IE switch); RJ45 ports; ISO; TCP; UDP; PROFINET IO controller; S7 communication; Open communication (SEND/ RECEIVE); S7 routing; IP configuration via DHCP/ Block; IP Access control list; time-of-day synchronization; extended web diagnostics; Fast Startup; Support for PROFIenergy |
|---|---|
| product brand name | SIMATIC NET |
| transfer rate: at the 1st interface | 10 ... 100 Mbit/s |
|---|
| number of interfaces / according to Industrial Ethernet | 2 |
|---|---|
| number of electrical connections: at the 1st interface / according to Industrial Ethernet | 2 |
| type of electrical connection: at the 1st interface / according to Industrial Ethernet | RJ45 port |
| design of the removable storage: C-PLUG | No |
| Part number | 6GK7443-1EX30-0XE0 |
|---|---|
| Type designation | CP 443-1 Communications processor CP 443-1; 2x 10/100 Mbit/s (IE switch); RJ45 ports; ISO; TCP; UDP; PROFINET IO controller; S7 communication; Open communication (SEND/ RECEIVE); S7 routing; IP configuration via DHCP/ Block; IP Access control list; time-of-day synchronization; extended web diagnostics; Fast Startup; Support for PROFIenergy |
| Brand | Siemens |
| Condition | New, factory sealed |
| Source | Siemens and its authorised distributors |
| Warranty | Manufacturer warranty |
| Lifecycle status | Phase-out announced by the manufacturer |
| EAN | 4019169206709 |
| ETIM class | EC001423 |
| eCl@ss | 27242208 |
| type of voltage / of the supply voltage | DC |
|---|---|
| supply voltage / 1 / from backplane bus | 5 V |
| relative symmetrical tolerance / at DC: at 5 V | 5% |
| consumed current: from backplane bus / at DC / at 5 V / typical | 1.4 A |
| power loss [W] | 7.25 W |
| ambient temperature: 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 % |
| protection class IP | IP20 |
| module format | Compact module S7-400 single width |
|---|---|
| width | 25 mm |
| height | 290 mm |
| depth | 210 mm |
| number of units: per CPU / maximum | 14 |
|---|---|
| number of units: note | max. 4 as PN IO ctrl. |
| number of possible connections / for open communication / by means of SEND/RECEIVE blocks / maximum | 64 |
|---|---|
| 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 |
| number of possible connections / for S7 communication: maximum | 128; when using several CPUs |
|---|---|
| number of possible connections / for S7 communication: with PG connections / maximum | 2 |
| number of active connections / with multi-protocol mode | 128 |
|---|
| product function / PROFINET IO controller | Yes |
|---|---|
| number of PN IO devices / on PROFINET IO controller / operable / total | 128 |
| number of PN IO IRT devices / on PROFINET IO controller / operable | 64 |
| number of external PN IO lines / with PROFINET / per rack | 4 |
| 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 |
| product function / MIB support | Yes |
|---|---|
| protocol / is supported: SNMP v1 | Yes |
| protocol / is supported: DCP | Yes |
| protocol / is supported: LLDP | Yes |
| configuration software: required | STEP 7 V5.5 SP3 or higher / STEP 7 Professional V12 (TIA Portal) or higher |
| 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 |
| protocol / is supported / Media Redundancy Protocol (MRP) | Yes |
| product function: password protection for Web applications | No |
|---|---|
| product function: ACL - IP-based | Yes |
| product function: ACL - IP-based for PLC/routing | No |
| 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 |
| protocol / is supported: SIMATIC time synchronization (SIMATIC Time) | Yes |
| certificate of suitability / CE marking | Yes |
|---|---|
| certificate of suitability / UKCA marking | Yes |
| certificate of suitability / cULus approval | Yes |
| certificate of suitability / KC approval | Yes |
| certificate of suitability / Regulatory Compliance Mark (RCM) | Yes |
| certificate of suitability / RoHS conformity | Yes |
| certificate of suitability / EAC approval | Yes |
| certificate of suitability / ATEX | Yes |
|---|---|
| certificate of suitability / IECEx | Yes |
| certificate of suitability / ULhazloc approval | Yes |
| certificate of suitability / CCC / for hazardous zone according to GB standard | Yes |
| certificate of suitability / FM registration | Yes |
| Marine classification association / French marine classification society (BV) | Yes |
|---|---|
| Marine classification association / Chinese Classification | Yes |
| Marine classification association / Det Norske Veritas (DNV) | Yes |
|---|
| Environmental Product Declaration | Yes |
|---|---|
| global warming potential [CO2 eq]: total | 291.68 kg |
| global warming potential [CO2 eq]: during manufacturing | 63.62 kg |
| global warming potential [CO2 eq]: during operation | 226.98 kg |
| global warming potential [CO2 eq]: after end of life | 1.08 kg |
| Net weight | 0.833 kg |
|---|---|
| Package dimensions | 129 × 35 × 142 mm |
| Country of origin | DE |
| Shipping weight | 1.333 kg |
| Ships from | Türkiye |
| Dispatch | 13 Nov |
| Stock | Low stock |
Source: manufacturer data · Last verified: 01 Nov 2026
No documents are on file for this part yet.
Ask us for the datasheetThe tariff (HS) code on file for CP 443-1 Communications processor CP 443-1; 2x 10/100 Mbit/s (IE switch); RJ45 ports; ISO; TCP; UDP; PROFINET IO controller; S7 communication; Open communication (SEND/ RECEIVE); S7 routing; IP configuration via DHCP/ Block; IP Access control list; time-of-day synchronization; extended web diagnostics; Fast Startup; Support for PROFIenergy is 85176200.
The EAN (GTIN) of CP 443-1 Communications processor CP 443-1; 2x 10/100 Mbit/s (IE switch); RJ45 ports; ISO; TCP; UDP; PROFINET IO controller; S7 communication; Open communication (SEND/ RECEIVE); S7 routing; IP configuration via DHCP/ Block; IP Access control list; time-of-day synchronization; extended web diagnostics; Fast Startup; Support for PROFIenergy is 4019169206709.
CP 443-1 Communications processor CP 443-1; 2x 10/100 Mbit/s (IE switch); RJ45 ports; ISO; TCP; UDP; PROFINET IO controller; S7 communication; Open communication (SEND/ RECEIVE); S7 routing; IP configuration via DHCP/ Block; IP Access control list; time-of-day synchronization; extended web diagnostics; Fast Startup; Support for PROFIenergy ships from Türkiye. Shipping calculated at checkout · import duties and taxes paid on arrival. Stock items are dispatched within 1–2 business days.
A step-by-step guide to matching PLC output type, coil voltage and current, contact rating, and socket style when selecting an interface relay.
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