PN/MQTT Coupler

PN/MQTT Coupler
PN/MQTT Coupler

PN/MQTT Coupler

The MQTT protocol has become established in recent years as a simple transmission protocol for messages in the IoT world. MQTT stands for "Message Queue Telemetry Transport Protocol" and is an OASIS standard. The MQTT protocol always uses a central broker for communication between devices, which receives messages from, for example, a sensor and forwards them to interested devices, such as a control unit. When a sensor sends data to the broker, it is called a "publish". If a device needs data, it must subscribe to the broker ("Subscribe"). The broker delivers the data to all subscribers when new data has arrived from the publisher.

With the PN/MQTT Coupler it is possible to transfer values between a PROFINET machine (PLC) and a MQTT broker. It is possible to send values from the PLC via PROFINET to a broker ("Publish") as well as to subscribe values from a MQTT broker and receive them in the PLC via PROFINET ("Subscribe").

The integration into the PLC engineering tool is enabled by a GSDML file, an extra configuration software is not necessary. All settings for the MQTT connection can be done on the web page of the device. MQTT brokers can be connected locally in the own network ("On premise") as well as via the internet in the cloud.

Direct integration into the PLC puts full control of the data exchange with the IoT world in the hands of the programmer.

  • Supports the OASIS MQTT standards V3.1.1 and V5
  • Easy assignment of IO data via GSDML file
  • Up to 100 values can be configured for transmission simultaneously
  • Flexible configuration via web browser
  • Separate networks for PROFINET and MQTT connection
  • Connection to brokers in the local network or directly with the "cloud"
  • Authentication (password, certificate) and encryption (TLS)
  • Supports AWS IoT, Microsoft Azue, HiveMQ, Siemens Mindsphere (in preparation)
  • Very compact design for DIN rail mounting
  • Redundant power supply
  • Galvanic isolation of the networks
Download PDF datasheet
General information
Order number700-162-3MQ02
Article namePN/MQTT Coupler
Scope of deliveryPN/MQTT Coupler
Dimensions (DxWxH)32.5 x 58.5 x 76 mm (without power supply connector)
WeightApprox. 135 g
PROFINET interface
Number1 with 2 ports
ProtocolPROFINET IO as defined in IEC 61158-6-10
Transmission rate100 Mbps full duplex
I/O image sizemax. 1024 bytes of input and output data
Connection2 x RJ45
integrated switchYes
FeaturesMedia redundancy (MRP), automatic addressing, topology detection (LLDP, DCP), diagnosis alarms
MQTT interface (X2)
Number1 with 2 ports
ProtocolMQTT V3.1.1 & V5
Transmission rate10/100 Mbps, full/half duplex
Connection2x RJ45, integrated switch
Status indicator9 LEDs function status, 8 LEDs Ethernet status
Voltage supply
Voltage supply24 V DC (18 - 28 V DC)
Current drawmax. 210 mA
Ambient conditions
Ambient temperature0 °C to 60 °C
Transport and storage temperature-20 °C to 80 °C
Protection ratingIP 20
CertificationsCE, PROFINET Conformance Class B (in preparation)


PROFINET coupler - IIoT starts with the right connection

Technical Documentation

PN/MQTT Coupler, Quick Start Guide 6 1 MBPN/MQTT Coupler, Quick Start Guide
PN/MQTT Coupler, Manual 4 4 MBPN/MQTT Coupler, Manual
PN/MQTT Coupler, PROFINET-Certificate 83 KBPN/MQTT Coupler, PROFINET-Certificate


Easy connection of fieldbus networks – with Helmholz PROFINET gateways 11-2021 1 MBEasy connection of fieldbus networks – with Helmholz PROFINET gateways


PN/MQTT Coupler, GSDML file 20220402 8 KBPN/MQTT Coupler, GSDML file
PN/MQTT Coupler, Firmware V1.10.002 14 MB History
IPSet 1.04.016 23 MB History IPSet, IP Set

Planning Tools

PN/MQTT Coupler, STEP Files 13 MBPN/MQTT Coupler, STEP Files

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