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Modbus TCP EtherNet IP to MQTT IoT Gateway

Modbus TCP EtherNet IP to MQTT IoT Gateway


MQT-805 supports Modbus bus protocol, Modbus TCP protocol (dual network port), Ethernet/IP protocol (dual network port) and transparent transmission (serial port), supports GPS positioning and 4G/3G/2G (full Netcom) wireless data communication network A remote monitoring terminal, mainly for industrial monitoring sites that require unattended and remote monitoring, can be used for Modbus, Modbus TCP master/slave equipment (industrial intelligent instrumentation, Schneider PLC, SCADA software, etc.), EtherNet/IP Scanner Equipment (OMRON, AB PLC, etc.), DI/DO equipment transmit data through 4G wireless network, support MQTT/MQTTS protocol to connect to major cloud platforms (Alibaba Cloud IoT, Baidu Tiangong, EMQ, AWS, etc.), widely used in water quality Monitoring, environmental testing, smart buildings, smart agriculture, energy, electricity and other fields that require remote monitoring of equipment


How to realize the automatic conversion of modbus RTU to AB Ethernet/IP protocol


PLC directly reads RS 485 modbus RTU instrument, need to add 1761-NET-AIC module, and then write the communication program.


If there are multiple instruments, the polling method is adopted. If there are dozens of instruments, the polling time is very long, and a large number of instructions need to be written. It will take a lot of time and energy to debug the communication. This is not what we want.


In this way, we can realize the automatic conversion of modbus RTU to AB Ethernet/IP protocol through GRM300 protocol gateway. In this way, the PLC does not need to write communication instructions, but only needs to create tags to receive the data sent by the gateway through the Ethernet/IP protocol.


The modbus protocol of the gateway reading instrument is also encapsulated, no need to write instructions, the configuration is the same as the configuration or the touch screen reading and writing instrument, just create a variable, corresponding to the register address of the instrument.


The first step is wiring. GRM300 has up to 5 isolated serial ports to collect frequency converters and instruments in parallel. Each RS485 channel is fully isolated and adopts 485 bus wiring mode. The PLC and gateway of AB 1756 are connected by network cable through the network port.


The second step is to configure the communication with the modbus instrument. The register address association between variables and instruments is established within GRM300.


All the communication protocol configuration is done automatically by the gateway. It is only necessary to define the association between variables and instruments and specific register addresses. This is a selection operation.


The third step is to configure the communication variable of AB 1756 and associate it with the label of AB. This is also a selection configuration without writing code.


The fourth step is to assign the value of the corresponding variable of the modbus meter to the corresponding variable of ABplc, which is to do an equation exchange


The data of the Modbus instrument is configured in just a few steps, and it is converted to the AB protocol through the gateway. All operations do not need to write any codes and commands, and add data variables, which can be edited in batches with tools such as EXCEL, and word, and imported, copied, etc. For a quick copy, the configuration of dozens of meters can be completed in one or two hours.


Moreover, the protocol gateway has multiple 485 communication ports, which can evenly distribute the instruments to different 485 ports, which will greatly improve the polling speed and realize rapid data collection.


Premier Cable is a leading cable connector factory in China with more than 400 workers 


We make a lot of cables as below :


modbus RTU RJ45 Ethernet Cable

Modbus TCP RJ45 EtherNet Gateway Cable

RS485 serial port to Ethernet RJ45 MODBUS Cable

RS485 USB Converter Modbus Profibus PLC Arduino

Communication Box RS485 interface Modbus USB Cable

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