IIoT Edge Gateway | Products — SGT Systems Limited

Overview

IIoT Edge Gateway is a DIN-rail industrial computer that bridges your existing PLCs, drives, sensors, and meters to MQTT brokers, REST APIs, and cloud platforms — without replacing a single existing controller. It talks Modbus TCP/RTU, Profinet, EtherNet/IP, S7, OPC UA, BACnet, DNP3, and IEC-104 on the south side; MQTT, REST, AMQP, Kafka, and OPC UA on the north side; and runs Node-RED, custom Python, or container workloads at the edge.

Built for plants where legacy controllers refuse to die but the management team wants real-time KPIs in the cloud. Store-and-forward buffering keeps data safe through WAN outages, OTA updates roll out new firmware safely with rollback, and TLS + X.509 certificates secure every northbound connection.

40+ protocol drivers south — PLCs, drives, meters, RTUs, sensors
MQTT / REST / Kafka / OPC UA north — cloud or on-prem
Edge analytics — Node-RED, Python, Docker containers, rules engine
OTA + delta updates — signed, rollback-safe, fleet-wide

How It Works

Each southbound driver polls or subscribes to its protocol on its own schedule, normalises the values into a unified tag model, and pushes them through an edge pipeline. Rules can fire local alarms or trigger writes back to the PLC; messages flow north with QoS guarantees and a 7-day store-and-forward buffer if the WAN goes down.

Southbound poll — multi-protocol drivers, parallel, per-device cycle times
Normalise — engineering-unit scaling, deadband, quality flags, tag metadata
Edge process — rules engine, anomaly detection, aggregation, ML inference
Northbound publish — MQTT QoS 0/1/2, REST batch, Kafka, OPC UA Server
Store & forward — up to 7 days of compressed history when WAN is unreachable

Features

40+ protocols — one box replaces a stack of gateways
Container runtime — Docker / Podman with resource limits per workload
Node-RED low-code — drag-and-drop edge flows for non-developers
Fleet management — central console for hundreds of gateways
Secure by default — TLS 1.3, X.509 mutual auth, secure boot, signed firmware
Cellular failover — built-in LTE Cat-4 with carrier-grade SIM management
OPC UA Server — expose any southbound tag as an OPC UA node to SCADA
Edge ML — run TensorFlow Lite / ONNX models on incoming streams

Use Cases

Legacy PLC modernisation — lift data from S7-300, ControlLogix, Mitsubishi Q without touching the program
Energy & sub-metering — aggregate dozens of Modbus RTU meters into one MQTT stream
Predictive maintenance — vibration / current trend from drives uploaded to cloud ML
Remote pumping stations — cellular gateway with local rules and store-forward
Multi-site SCADA consolidation — one OPC UA aggregator per plant feeding HQ
Smart building integration — bridge BACnet HVAC to cloud analytics

Specifications

CPU: Quad-core ARM Cortex-A72 1.8 GHz / optional Intel x86-64 Atom
Memory: 2 GB / 4 GB / 8 GB RAM, 16 GB / 32 GB / 64 GB eMMC + microSD slot
Ports: 2–4× Gigabit Ethernet, 2× RS-485, 1× RS-232, 1× CAN, 2× USB
Wireless: Wi-Fi 802.11ac, BT 5, LTE Cat-4 / Cat-M1 / NB-IoT options
Power: 9–36 VDC, 8 W typical, optional PoE-PD
Environment: −30 to +70 °C, IP30, 5–95 % RH, DIN-rail mount
Security: Secure boot, TPM 2.0, TLS 1.3, X.509 mutual auth, signed OTA
Certifications: CE, FCC, UL 508, EN 61131-2 IIoT, optional ATEX Zone 2