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.
The Siemens CP 443-5 Extended (6GK7443-5DX05-0XE0) is a communication processor that connects a SIMATIC S7-400 CPU to PROFIBUS DP, acting as a DP master (DPV1) for up to 125 distributed I/O devices at transfer rates from 9.6 kbit/s to 12 Mbit/s over a 9-pin Sub-D RS485 port. It also supports S7 communication, open communication (SEND/RECEIVE), and dataset routing, drawing 5 V from the backplane bus at 0.6 A typical.
The 125-device DP master capacity and 4096 byte total I/O address range make this CP the choice when an S7-400 station needs PROFIBUS DP as a dedicated fieldbus alongside PROFINET handled by a separate CP 443-1 - up to 10 CP 443-5 Extended modules can operate as DP masters in one S7-400 station. Dataset routing with up to 30 connections lets engineering tools reach DP slaves through the S7-400 backplane without a direct PROFIBUS connection at the PC.
Connects PROFIBUS DP field devices - drives, remote I/O, valve islands - to an S7-400 CPU in process and machine control systems that still run PROFIBUS-based field instrumentation alongside newer PROFINET segments.
| product type designation | CP 443-5 Extended Communications processor CP 443-5 Extended for connection of SIMATIC S7-400 to PROFIBUS DP, S5-compatible, PG/OP and S7 communication. |
|---|---|
| product brand name | SIMATIC NET |
| transfer rate: at the 1st interface / according to PROFIBUS | 9.6 kbit/s ... 12 Mbit/s |
|---|
| number of interfaces / according to Industrial Ethernet | 0 |
|---|---|
| number of electrical connections: at the 1st interface / according to PROFIBUS | 1 |
| type of electrical connection: at the 1st interface / according to PROFIBUS | 9-pin Sub-D socket (RS485) |
| Part number | 6GK7443-5DX05-0XE0 |
|---|---|
| Type designation | CP 443-5 Extended Communications processor CP 443-5 Extended for connection of SIMATIC S7-400 to PROFIBUS DP, S5-compatible, PG/OP and S7 communication. |
| Brand | Siemens |
| Condition | New, factory sealed |
| Source | Siemens and its authorised distributors |
| Warranty | Manufacturer warranty |
| Lifecycle status | Active, in production |
| EAN | 4019169212090 |
| 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 | 0.6 A |
| power loss [W] | 3 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 | The number of CPs that can be operated as DP masters depends on the number of CP 443-1 Advanced processors operating in the S7-400 station as PROFINET IO controllers. Up to 10 CPs can be operated in total: up to 4 as PROFINET IO controllers (CP 443-1 Advanced); up to 10 as DP masters (CP 443-5 Extended) |
| number of possible connections / for open communication / by means of SEND/RECEIVE blocks / maximum | 32 |
|---|---|
| data volume: as user data per connection / for open communication / by means of SEND/RECEIVE blocks / maximum | 240 byte |
| service / as DP master: DPV1 | Yes |
|---|---|
| number of DP devices: on DP master / operable | 125 |
| data volume: of the address range of the inputs / as DP master / total | 4096 byte |
| data volume: of the address range of the outputs / as DP master / total | 4096 byte |
| data volume: of the address range of the inputs / per DP device | 244 byte |
| data volume: of the address range of the outputs / per DP device | 244 byte |
| number of possible connections / for S7 communication: maximum | 48 |
|---|
| number of active connections / with multi-protocol mode: without DP / maximum | 59 |
|---|---|
| number of active connections / with multi-protocol mode: with DP / maximum | 54 |
| configuration software: required | STEP 7 V5.4 SP4 or higher / STEP 7 Professional V12 (TIA Portal) or higher |
|---|---|
| product function / is supported / identification link | Yes; acc. to IEC 61406-1:2022 |
| number of possible connections / with dataset routing / maximum | 30 |
|---|
| product function / pass on time synchronization | 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 / 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 / CCC / for hazardous zone according to GB standard | Yes |
| certificate of suitability / FM registration | Yes |
| Marine classification association / American Bureau of Shipping | Yes |
|---|
| Marine classification association / French marine classification society (BV) | Yes |
|---|---|
| Marine classification association / Chinese Classification | Yes |
| Marine classification association / Det Norske Veritas (DNV) | Yes |
|---|---|
| Marine classification association / Nippon Kaiji Kyokai (NK) | Yes |
| Environmental Product Declaration | Yes |
|---|---|
| global warming potential [CO2 eq]: total | 350.22 kg |
| global warming potential [CO2 eq]: during manufacturing | 65.61 kg |
| global warming potential [CO2 eq]: during operation | 281.89 kg |
| global warming potential [CO2 eq]: after end of life | 2.72 kg |
| formity tion | For use in hazard- |
|---|---|
| General Product Approval | ous locations China RoHS |
| Net weight | 0.847 kg |
|---|---|
| Package dimensions | 74 × 60 × 117 mm |
| Country of origin | DE |
| Shipping weight | 1.347 kg |
| Ships from | Türkiye |
| Dispatch | 13 Nov |
| Stock | Low stock |
Source: manufacturer data · Last verified: 01 Nov 2026
The tariff (HS) code on file for CP 443-5 Extended Communications processor CP 443-5 Extended for connection of SIMATIC S7-400 to PROFIBUS DP, S5-compatible, PG/OP and S7 communication. is 85176200.
The EAN (GTIN) of CP 443-5 Extended Communications processor CP 443-5 Extended for connection of SIMATIC S7-400 to PROFIBUS DP, S5-compatible, PG/OP and S7 communication. is 4019169212090.
CP 443-5 Extended Communications processor CP 443-5 Extended for connection of SIMATIC S7-400 to PROFIBUS DP, S5-compatible, PG/OP and S7 communication. 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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