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 1542-5 (6GK7542-5FX00-0XE0) is a communications processor that connects a SIMATIC S7-1500 CPU to PROFIBUS DP at 9.6 kbit/s to 12 Mbit/s, operating as a DPV1 master for up to 32 DP devices or as a DP device itself. It supports S7 and PG/OP communication over a 9-pin Sub-D RS485 port, drawing 0.1 A typical from the backplane bus.
As a DPV1 master this CP handles up to 32 PROFIBUS DP devices with 2048 byte of input and output address space, while as a DP device it presents 240 byte each way to a higher-level master - covering both roles from one module. Choose the CP 1542-5 over the spare-part CM 1542-5 when a full published spec sheet and current TED data are needed for a new design rather than a like-for-like replacement.
Connects SIMATIC S7-1500 stations to PROFIBUS DP networks - as master for drives, remote I/O, and sensors, or as a device reporting into a plant-wide PROFIBUS master - in installations that still run PROFIBUS alongside newer PROFINET segments.
| product type designation | CP 1542-5 ********** spare part ********* communications processor CP 1542-5 for connection of SIMATIC S7-1500 to PROFIBUS DP, DPV1 master or DP device, S7 and PG/OP communication, time synchronization, diagnostics, reduced quantity structure. |
|---|---|
| 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 | 6GK7542-5FX00-0XE0 |
|---|---|
| Type designation | CP 1542-5 ********** spare part ********* communications processor CP 1542-5 for connection of SIMATIC S7-1500 to PROFIBUS DP, DPV1 master or DP device, S7 and PG/OP communication, time synchronization, diagnostics, reduced quantity structure. |
| Brand | Siemens |
| Condition | New, factory sealed |
| Source | Siemens and its authorised distributors |
| Warranty | Manufacturer warranty |
| Lifecycle status | Phase-out announced by the manufacturer |
| EAN | 4019169259958 |
| type of voltage / of the supply voltage | DC |
|---|---|
| supply voltage / 1 / from backplane bus | 15 V |
| relative symmetrical tolerance / at DC: at 15 V | 3% |
| consumed current: from backplane bus / at DC / at 15 V / typical | 0.1 A |
| power loss [W] | 1.5 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 % |
| protection class IP | IP20 |
| module format | Compact module S7-1500 single width |
|---|---|
| width | 35 mm |
| height | 142 mm |
| depth | 129 mm |
| fastening method: S7-1500 rail mounting | Yes |
| number of units: per CPU / maximum | 8 |
|---|---|
| number of units: note | depending on CPU type |
| 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 | 2048 byte |
| data volume: of the address range of the outputs / as DP master / total | 2048 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 |
| service / as DP device: DPV0 | Yes |
| service / as DP device: DPV1 | Yes |
| data volume: of the address range of the inputs / as DP device / total | 240 byte |
| data volume: of the address range of the outputs / as DP device / total | 240 byte |
| number of possible connections / for S7 communication: maximum | 16; depending on the system upper limit |
|---|
| number of active connections / with multi-protocol mode | 16 |
|---|
| protocol / is supported: TCP/IP | No |
|---|
| configuration software: required | STEP 7 Professional V12 SP1 (TIA Portal) or higher |
|---|---|
| identification & maintenance function: I&M0 - device-specific information | Yes |
| identification & maintenance function: I&M1 - higher level designation/location designation | Yes |
| product function / web-based diagnostics | Yes; via S7-1500 CPU |
|---|
| product function / pass on time synchronization | Yes |
|---|
| certificate of suitability / CCC / for hazardous zone according to GB standard | Yes |
|---|
| Environmental Product Declaration | Yes |
|---|---|
| global warming potential [CO2 eq]: total | 68.56 kg |
| global warming potential [CO2 eq]: during manufacturing | 21.24 kg |
| global warming potential [CO2 eq]: during operation | 46.97 kg |
| global warming potential [CO2 eq]: after end of life | 0.35 kg |
| Net weight | 0.339 kg |
|---|---|
| Package dimensions | 120 × 40 × 125 mm |
| Country of origin | DE |
| Shipping weight | 0.839 kg |
| Ships from | Türkiye |
| Dispatch | — |
| Stock | On request |
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 1542-5 ********** spare part ********* communications processor CP 1542-5 for connection of SIMATIC S7-1500 to PROFIBUS DP, DPV1 master or DP device, S7 and PG/OP communication, time synchronization, diagnostics, reduced quantity structure. is 85176200.
The EAN (GTIN) of CP 1542-5 ********** spare part ********* communications processor CP 1542-5 for connection of SIMATIC S7-1500 to PROFIBUS DP, DPV1 master or DP device, S7 and PG/OP communication, time synchronization, diagnostics, reduced quantity structure. is 4019169259958.
CP 1542-5 ********** spare part ********* communications processor CP 1542-5 for connection of SIMATIC S7-1500 to PROFIBUS DP, DPV1 master or DP device, S7 and PG/OP communication, time synchronization, diagnostics, reduced quantity structure. ships from Türkiye. Shipping calculated at checkout · import duties and taxes paid on arrival.
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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