OpcVue: OPC-UA & Modbus HMI

OpcVue is a native Android HMI and SCADA client designed for commissioning engineers, plant technicians, and automation developers. It connects directly to industrial PLCs, PACs, and IoT gateways over OPC-UA and Modbus TCP, giving you a responsive real-time dashboard on your phone or tablet without requiring a cloud middleman.

Whether you are troubleshooting a machine on the factory floor, verifying I/O during commissioning, or monitoring a remote pump station, OpcVue gives you direct access to live process tags.


KEY FEATURES

• Multi-Protocol Support: Connect simultaneously to OPC-UA servers (IEC 62541) and Modbus TCP devices.
• Real-Time Widgets: Radial & bar gauges, live trend charts, setpoint sliders, toggle switches, momentary push buttons, and 16-bit alarm word annunciators.
• OPC-UA Node Browser: Interactive address space tree browser with live search and multi-node selection.
• Modbus Address Support: Full support for Holding Registers (4x), Input Registers (3x), Coils (0x), and Discrete Inputs (1x) with multi-drop Slave ID routing (1–255).
• Data Types & Byte Orders: Supports Boolean, Int16, Int32, UInt16, UInt32, and IEEE 754 Float32 with standard and byte/word-swapped (CDAB) formats.
• Industrial Safety Controls: Hold-to-activate and slide-to-confirm interlocks for critical write operations, plus configurable watchdog heartbeat loops.
• Automatic Local Backup: All connection profiles and dashboard layouts are continuously backed up to local JSON storage for instant disaster recovery.
• Offline Profile Sharing: Export and import complete dashboard configurations via encrypted JSON files.


COMMUNICATION & COMPATIBILITY

• OPC-UA Security: Supports None, Basic256, and Basic256Sha256 with on-device X.509 RSA certificates and User/Password authentication.
• Direct TCP Socket Connections: Connects directly to PLC IP addresses on ports 4840, 502, or custom ports over Wi-Fi, VPN, or cellular routing.
• Compatible Hardware: Tested with Siemens S7-1200/1500, Beckhoff TwinCAT, Schneider Electric M241/M251, ABB, Omron, WAGO, Rockwell/Allen-Bradley (via Modbus gateway), Arduino Opta, ESP32, Node-RED, and Codesys runtimes.


PRIVACY & LOCAL SECURITY

OpcVue is built with a strict on-device data model:
• Zero Cloud Telemetry: Sensor values, process data, and register states are processed purely in local memory and are never sent to external servers.
• Hardware-Backed Security: Passwords and private keys are encrypted locally using Android KeyStore.
• Direct Connection: All network traffic stays strictly between your mobile device and your PLC.