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 6GK7243-5DX30-0XE0 CM 1243-5 is a SIMATIC S7-1200 communication module that connects the CPU to PROFIBUS as a DP master, supporting up to 32 DP devices and DPV1 service. It operates from a 24 V DC supply, draws 0.1 A typical, and dissipates 2.4 W.
The 32-device DP master capacity and 512-byte total input/output address range size this module for a full-scale PROFIBUS segment feeding an S7-1200, rather than a handful of drives - for a single VFD or simple slave device, PROFIBUS wiring overhead may not be worth it versus PROFINET. Up to 3 CM 1243-5 modules can be added per CPU, useful when migrating an existing PROFIBUS plant floor onto an S7-1200 without re-cabling every DP slave to Ethernet. The RS485 Sub-D interface and DPV1 support match standard third-party PROFIBUS DP slave devices without protocol conversion.
Used to integrate an S7-1200 CPU into an existing PROFIBUS DP network as master, connecting legacy drives, remote I/O, or third-party DP slave devices during brownfield migrations.
| product type designation | CM 1243-5 communications module CM 1243-5 for connection of SIMATIC S7-1200 to PROFIBUS as DP Master module; PG/OP communication; 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 |
| number of electrical connections: for power supply | 1 |
| type of electrical connection: at the 1st interface / according to PROFIBUS | 9-pin Sub-D socket (RS485) |
| type of electrical connection: for power supply | 3-pole terminal block |
| Part number | 6GK7243-5DX30-0XE0 |
|---|---|
| Type designation | CM 1243-5 communications module CM 1243-5 for connection of SIMATIC S7-1200 to PROFIBUS as DP Master module; PG/OP communication; S7 communication. |
| Brand | Siemens |
| Condition | New, factory sealed |
| Source | Siemens and its authorised distributors |
| Warranty | Manufacturer warranty |
| Lifecycle status | Phase-out announced by the manufacturer |
| EAN | 4019169211215 |
| ETIM class | EC001423 |
| eCl@ss | 27242208 |
| type of voltage / of the supply voltage | DC |
|---|---|
| supply voltage / external | 24 V |
| supply voltage / external / at DC / rated value | 24 V |
| relative positive tolerance / at DC / at 24 V | 20 % |
| relative negative tolerance / at DC / at 24 V | 20 % |
| consumed current: from external supply voltage / at DC / at 24 V / typical | 0.1 A |
| power loss [W] | 2.4 W |
| ambient temperature: for vertical installation / during operation | 0 ... 45 °C |
|---|---|
| ambient temperature: for horizontally arranged busbars / during operation | 0 ... 55 °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 S7-1200 single width |
|---|---|
| width | 30 mm |
| height | 100 mm |
| depth | 75 mm |
| fastening method: 35 mm DIN-rail mounting | Yes |
| fastening method: S7-300 rail mounting | No |
| fastening method: wall mounting | Yes |
| number of units: per CPU / maximum | 3 |
|---|
| service / as DP master: DPV1 | Yes |
|---|---|
| number of DP devices: on DP master / operable | 32 |
| data volume: of the address range of the inputs / as DP master / total | 512 byte |
| data volume: of the address range of the outputs / as DP master / total | 512 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 |
| data volume: of the address range of the diagnostic data / per DP device | 240 byte |
| service / as DP device: DPV0 | No |
| service / as DP device: DPV1 | No |
| number of possible connections / for S7 communication: maximum | 8; max. 4 connections to other S7 stations |
|---|---|
| number of possible connections / for S7 communication: with PG connections / maximum | 1 |
| number of active connections / with multi-protocol mode: without DP / maximum | 8 |
|---|---|
| number of active connections / with multi-protocol mode: with DP / maximum | 8 |
| protocol / is supported: TCP/IP | No |
|---|
| configuration software: required | STEP 7 Basic/Professional |
|---|---|
| product function / is supported / identification link | Yes; acc. to IEC 61406-1:2022 |
| certificate of suitability / CE marking | Yes |
|---|---|
| certificate of suitability / UKCA marking | 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 / 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 / Det Norske Veritas (DNV) | Yes |
| Marine classification association / Lloyds Register of Shipping | Yes |
| Marine classification association / Nippon Kaiji Kyokai (NK) | Yes |
|---|---|
| Marine classification association / Royal Institution of Naval | Yes |
| Environmental Product Declaration | Yes |
|---|---|
| global warming potential [CO2 eq]: total | 89.58 kg |
| global warming potential [CO2 eq]: during manufacturing | 14.29 kg |
| global warming potential [CO2 eq]: during operation | 75.11 kg |
| global warming potential [CO2 eq]: after end of life | 0.18 kg |
| Net weight | 0.193 kg |
|---|---|
| Package dimensions | 120 × 80 × 125 mm |
| Country of origin | DE |
| Shipping weight | 0.693 kg |
| Ships from | Türkiye |
| Dispatch | 11 Nov |
| Stock | In stock |
Source: manufacturer data · Last verified: 01 Nov 2026
No documents are on file for this part yet.
Ask us for the datasheetThe rated current of CM 1243-5 communications module CM 1243-5 for connection of SIMATIC S7-1200 to PROFIBUS as DP Master module; PG/OP communication; S7 communication. is 0.1 A.
The tariff (HS) code on file for CM 1243-5 communications module CM 1243-5 for connection of SIMATIC S7-1200 to PROFIBUS as DP Master module; PG/OP communication; S7 communication. is 85176200.
The EAN (GTIN) of CM 1243-5 communications module CM 1243-5 for connection of SIMATIC S7-1200 to PROFIBUS as DP Master module; PG/OP communication; S7 communication. is 4019169211215.
CM 1243-5 communications module CM 1243-5 for connection of SIMATIC S7-1200 to PROFIBUS as DP Master module; PG/OP communication; 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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