EHMI
Human-machine Interface – IoT Gateway
Human-machine interface and IoT gateway for integrating Modbus RTU sensors, displaying measurements and connecting devices to remote monitoring.
Description
The EHMI – IOT is an advanced, flexible monitoring solution that integrates industrial equipment and substations into an IoT ecosystem. Its storage capacity, remote communication and compatibility with industry-standard protocols provide comprehensive, efficient monitoring, improving operational safety and optimizing predictive maintenance.
The EHMI – IOT communicates with up to 32 sensors using the Modbus RTU protocol. It processes the received quantities, allowing mathematical formulas to be applied and units of measurement to be defined before presenting them on its OLED display. The display organizes information from up to 32 devices into structured pages, making it easy to view and track monitored data.
The EHMI – IOT has an integrated WiFi modem with a built-in 3 dBi antenna and an Ethernet port with an RJ45 connector. When enabled, this feature allows Internet connectivity and immediate transmission of collected and measured data to an MQTT broker server. Data can be accessed through the MONITRAFO.com platform, enabling remote monitoring of equipment and substations.
The EHMI uses the MQTT protocol and integrates advanced tools such as Artificial Intelligence, Machine Learning, Databases, Programmable Functions, Automatic Calculations and Notifications. If the connection is lost, data is stored locally and sent to the server later.
With the MONITRAFO platform, users can configure custom projects, track measurements in real time and access detailed reports on monitored quantities, actuations, alarms and predictive maintenance. Monitoring is available through a web browser or the MONITRAFO app for Android and iOS.
When integrated with the MONITRAFO platform, the EHMI – IOT provides a complete ecosystem for monitoring and managing electrical assets, significantly expanding its functionality:
• Efficient Monitoring: Access to advanced monitoring, diagnostic and failure prevention tools directly from the cloud, providing flexibility and operation from anywhere with Internet access.
• Real-time Alerts: Immediate failure and alarm notifications via SMS, WhatsApp and email, ensuring fast responses to critical events.
• Artificial Intelligence Reports: Generation of detailed reports with precise diagnostics, supporting preventive maintenance and identification of potential problems before they become critical.
• Interactive Dashboards: Custom project views in modes such as Dashboard, Overview and Map, making it easy to identify active events and efficiently manage monitored assets.
• Event Annunciator: Real-time notifications to the entire team about substation events, promoting effective collaboration and ongoing equipment maintenance.
• Maintenance Schedule: Periodic maintenance recommendations generated by IEDs and artificial intelligence, ensuring optimal performance and extending the service life of sensors and electrical assets.
• Team Communication: Easy integration and communication among team members through platform notifications and chat, optimizing maintenance management and maintaining an action history.
• API and Integrations: Support for multiple programming languages and integration with ERP systems and IoT platforms such as SAP, Oracle, Totvs, AWS, Google Cloud, Azure and IBM Watson, providing flexibility and versatility to meet specific user needs.
Technical data
Dimensions and Power Supply
• 98 mm square device with a depth of 54 mm;
• Universal 24–275 VDC / VAC power supply;
Human-machine Interface (HMI)
• High-visibility OLED display:
• Resolution: 128 x 64 pixels
• Contrast adjustment and color inversion
• Information from up to 32 devices organized into pages
• IPD (Intelligent Presence Detector): automatically activates the display when a user is detected at 1.5 m
• High-reliability internal clock:
• HMS indication (hours, minutes, seconds)
• Supercapacitor power backup (withstands high temperatures, no replacement required)
Communication Protocols
• Modbus RTU Protocol: Enables efficient integration and communication with up to 32 sensors or devices, ensuring real-time data collection and processing.
• Protocol Gateway: Variables received through the RS485 Modbus Master port are transparently made available to the RS485 Slave port and the Ethernet (RJ45) port and can be sent to the SCADA system using the Modbus RTU and/or DNP3 protocols native to the EHMI.
Communication Ports
• 2 RS-485 ports:
o ANSI/TIA/EIA-485-A standard
o Half duplex, multipoint, up to 32 devices
o Maximum distance: 1,200 meters
o Speed from 1,200 to 57,600 bps
o SLAVE: Modbus RTU, DNP3 Level 2, retransmission of received data
– MASTER: Configurable Modbus RTU, with variable processing and mathematical formulas
– Capacity for up to 32 sensors
– Processing of received variables using mathematical formulas and configurable units of measurement
– Intelligent organization on the OLED display
– Programmable relays for actuation based on RS-485 events
• WiFi modem:
o Connection via 802.11 b/g/n/e/i
o WPA/WPA2/WPA-Enterprise security protocol
o AES/RSA/ECC/SHA encryption
o Transmission up to 150 Mbps with a built-in 3 dBi antenna
• Ethernet TCP/IP (RJ-45):
o Support for Modbus TCP, Modbus RTU and MQTT
o Integration with servers and remote monitoring systems
• USB Type-C:
o Version 2.0, 480 Mbps transfer rate
o Compatible with Use Easy software for parameter configuration
Applications
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