OPC Connectivity

The complete OPC connectivity platform — OPC UA, OPC DA, OPC HDA, and OPC A&E in one server

KEPServerEX by Kepware is the industry’s most comprehensive OPC server, supporting every OPC standard — OPC UA, OPC DA, OPC HDA, and OPC A&E — from a single installation. With over 150 native device drivers covering virtually every PLC, RTU, and controller manufacturer, KEPServerEX is the standard choice for OPC connectivity in manufacturing and industrial automation.

All OPC standards, one platform

KEPServerEX eliminates the complexity of managing multiple OPC servers by unifying all OPC standards in one platform:

• OPC UA (Unified Architecture) — the modern, platform-independent standard with built-in security, certificate-based authentication, and firewall-friendly communication. Learn more about OPC UA connectivity →
• OPC DA (Data Access) — the widely deployed classic standard for real-time data exchange between devices and Windows-based applications. Learn more about OPC DA connectivity →
• OPC HDA (Historical Data Access) — retrieve historical values from KEPServerEX’s internal datalogger for trending and analysis.
• OPC A&E (Alarms and Events) — alarm and event subscriptions for monitoring critical process conditions.

150+ device drivers

The foundation of KEPServerEX’s value is the breadth of its device connectivity. A single KEPServerEX instance can connect to Siemens, Allen-Bradley, Modbus, Mitsubishi, Omron, GE, Yokogawa, Honeywell, and dozens of other manufacturers — then present that data through any OPC standard your applications require.

Beyond OPC: MQTT, REST, and IoT

KEPServerEX extends OPC connectivity to modern IT protocols through the IoT Gateway plug-in. Publish device data as MQTT messages (including Sparkplug B format) or expose it through REST API endpoints. This bridges the gap between the OPC world on the plant floor and cloud platforms, analytics services, and enterprise applications.

OPC server reliability features

• RedundancyMaster — configure multiple OPC servers into redundant pairs, ensuring continuous data availability even if a server fails.
• LinkMaster — link data between multiple OPC servers, acting as a universal bridge for distributed OPC architectures.
• Store-and-forward — buffer data locally during network interruptions and deliver it when connectivity resumes.
• Concurrent multi-protocol access — serve OPC UA, OPC DA, OPC HDA, and OPC A&E clients simultaneously from the same data set.

OPC connectivity across Southeast Asia

Allied Solutions Global is the authorised Kepware distributor across Singapore, Malaysia, and Vietnam. Our engineers handle OPC server architecture design, KEPServerEX licensing and deployment, DCOM and certificate configuration, integration with SCADA, historian, MES, and ERP systems, and ongoing technical support. We support both greenfield OPC UA deployments and brownfield OPC DA environments — including migration planning when the time is right.