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 6GK7545-1GX00-0XE0 CP 1545-1 is a communications processor that connects a SIMATIC S7-1500 CPU to Industrial Ethernet through a single RJ45 port running from 10 to 1000 Mbit/s. It adds TCP/IP, S7 communication, and MQTT cloud connectivity to the CPU, plus a stateful firewall with IPSec VPN for up to 16 secured connections, and up to eight modules can run per CPU depending on CPU type.
The 16-connection IPSec VPN and stateful firewall make the CP 1545-1 the module to add when an S7-1500 station needs a protected remote-access or cloud path rather than plain Ethernet exposure through the CPU's integrated port. Its MQTT client and 500-data-point limit fit periodic telemetry to a cloud broker, not high-frequency process data acquisition. Because up to eight modules can share one CPU (the exact count depends on CPU type), a station that needs several isolated network segments - for example a plant network plus a separate maintenance VPN - can add a second or third CP 1545-1 instead of routing everything through one interface.
| product type designation | CP 1545-1 communications processor CP 1545-1 for connection of SIMATIC S7-1500 to Industrial Ethernet; TCP/IP, UDP, S7 communication, security (VPN, firewall), SNMPv1/v3, DHCP, FTP client/server, email, IPv4/IPv6, time-of-day synchronization via NTP, connection to cloud systems via MQTT, 1x RJ45 (10/100/1000 Mbps). |
|---|---|
| product brand name | SIMATIC NET |
| transfer rate: at the 1st interface | 10 ... 1000 Mbit/s |
|---|
| number of interfaces / according to Industrial Ethernet | 1 |
|---|---|
| number of electrical connections: at the 1st interface / according to Industrial Ethernet | 1 |
| type of electrical connection: at the 1st interface / according to Industrial Ethernet | RJ45 port |
| Part number | 6GK7545-1GX00-0XE0 |
|---|---|
| Type designation | CP 1545-1 communications processor CP 1545-1 for connection of SIMATIC S7-1500 to Industrial Ethernet; TCP/IP, UDP, S7 communication, security (VPN, firewall), SNMPv1/v3, DHCP, FTP client/server, email, IPv4/IPv6, time-of-day synchronization via NTP, connection to cloud systems via MQTT, 1x RJ45 (10/100/1000 Mbps). |
| Brand | Siemens |
| Condition | New, factory sealed |
| Source | Siemens and its authorised distributors |
| Warranty | Manufacturer warranty |
| Lifecycle status | Discontinued by the manufacturer |
| EAN | 4047622526293 |
| 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 | 0.3 A |
| power loss [W] | 4.5 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 |
| product features, product functions, product components / general number of units: per CPU / maximum | 8 |
| protocol / is supported: Message Queuing Telemetry Transport (MQTT) | Yes |
|---|---|
| protocol / is supported: Advanced Message Queuing Protocol (AMQP) | No |
| product function / for cloud connectivity: trigger management | Yes |
| product function / for cloud connectivity: time stamping | Yes |
| product feature / for cloud connectivity / buffered message frame memory | No |
| number of data points per device / maximum | 500 |
| number of possible connections / for open communication: by means of T blocks / maximum | 118; depending on the system upper limit |
|---|---|
| data volume: as user data per ISO on TCP connection / for open communication / by means of T blocks / maximum | 65536 byte |
| number of Multicast stations | 118 |
| number of possible connections / for S7 communication: maximum | 118; depending on the system upper limit |
|---|
| number of active connections / with multi-protocol mode | 118 |
|---|
| number of possible connections: as client / by means of FTP / maximum | 32 |
|---|---|
| number of possible connections: as server / by means of FTP / maximum | 16 |
| number of possible connections: as server / by means of HTTP / maximum | 4 |
| number of possible connections: as email client / maximum | 1 |
| data volume / as user data for email / maximum | 64 Kibyte |
| 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 | STEP 7 Professional V15.1 (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 / is supported / identification link | Yes; acc. to IEC 61406-1:2022 |
| product function / web-based diagnostics | Yes; via S7-1500 CPU |
|---|
| service / routing / note | IP routing up to 1 Mbps |
|---|---|
| product function: static IP routing | Yes |
| product function: static IP routing IPv6 | No |
| product function: dynamic IP routing | No |
| product function: dynamic IP routing IPv6 | No |
| protocol / is supported: RIP v1 | No |
| protocol / is supported: RIPv2 | No |
| protocol / is supported: RIPnG for IPv6 | No |
| protocol / is supported: OSPFv2 | No |
| protocol / is supported: OSPFv3 for IPv6 | No |
| protocol / is supported: VRRP | No |
| protocol / is supported: VRRP for IPv6 | No |
| protocol / is supported: BGP | No |
| protocol / is supported: PPP | No |
| protocol / is supported: PPoE via DSL | No |
| firewall version | stateful inspection |
|---|---|
| product function / with VPN connection | IPSec |
| type of encryption algorithms / with VPN connection | AES-256, AES-192, AES-128, 3DES-168, DES-56 |
| type of authentication procedure / with VPN connection | Preshared key (PSK), X.509v3 certificates |
| type of hashing algorithms / with VPN connection | MD5, SHA-1, SHA-256, SHA-384, SHA-512 |
| number of possible connections / with VPN connection | 16 |
| product function: password protection for Web applications | No |
| product function: ACL - IP-based | No |
| 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 | No |
| product function: log file for unauthorized access | Yes |
| product function / SICLOCK support | No |
|---|---|
| product function / pass on time synchronization | Yes |
| protocol / is supported: NTP | 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 |
| Environmental Product Declaration | Yes |
|---|---|
| global warming potential [CO2 eq]: total | 162.49 kg |
| global warming potential [CO2 eq]: during manufacturing | 21.24 kg |
| global warming potential [CO2 eq]: during operation | 140.9 kg |
| global warming potential [CO2 eq]: after end of life | 0.35 kg |
| Net weight | 0.1 kg |
|---|---|
| Package dimensions | 129 × 35 × 142 mm |
| Country of origin | DE |
| Shipping weight | 0.6 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 rated current of CP 1545-1 communications processor CP 1545-1 for connection of SIMATIC S7-1500 to Industrial Ethernet; TCP/IP, UDP, S7 communication, security (VPN, firewall), SNMPv1/v3, DHCP, FTP client/server, email, IPv4/IPv6, time-of-day synchronization via NTP, connection to cloud systems via MQTT, 1x RJ45 (10/100/1000 Mbps). is 0.3 A.
The tariff (HS) code on file for CP 1545-1 communications processor CP 1545-1 for connection of SIMATIC S7-1500 to Industrial Ethernet; TCP/IP, UDP, S7 communication, security (VPN, firewall), SNMPv1/v3, DHCP, FTP client/server, email, IPv4/IPv6, time-of-day synchronization via NTP, connection to cloud systems via MQTT, 1x RJ45 (10/100/1000 Mbps). is 85176200.
The EAN (GTIN) of CP 1545-1 communications processor CP 1545-1 for connection of SIMATIC S7-1500 to Industrial Ethernet; TCP/IP, UDP, S7 communication, security (VPN, firewall), SNMPv1/v3, DHCP, FTP client/server, email, IPv4/IPv6, time-of-day synchronization via NTP, connection to cloud systems via MQTT, 1x RJ45 (10/100/1000 Mbps). is 4047622526293.
CP 1545-1 communications processor CP 1545-1 for connection of SIMATIC S7-1500 to Industrial Ethernet; TCP/IP, UDP, S7 communication, security (VPN, firewall), SNMPv1/v3, DHCP, FTP client/server, email, IPv4/IPv6, time-of-day synchronization via NTP, connection to cloud systems via MQTT, 1x RJ45 (10/100/1000 Mbps). 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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