Prevent Data Loss in Industrial Systems with OPC Bridge

In industrial environments, failures are not a matter of if—they’re a matter of when. A server goes down. A VM reboots. A network switch drops traffic. And suddenly, the data your control system depends on is gone.

When that happens, production doesn’t politely wait.

OPC Bridge, built into OPC Expert, is designed specifically to prevent those moments from turning into downtime. It keeps data flowing—even during hardware or software failures—by automatically switching to standby sources and maintaining continuity across OPC DA and OPC UA systems.

Let’s walk through how that works in practical terms.

OPC servers cannot initiate communication on their own. They only respond to requests. That means if a primary source disappears, nothing automatically fills the gap.

OPC Bridge solves this by acting as an intelligent intermediary. It reads from a source server and writes to a destination server, handling the communication and monitoring in between.

More importantly, it actively monitors connections and automatically manages failover.

When configuring a bridge, the process is visual and straightforward.

Above, you can see the left-hand tree connected to a Siemens OPC server and the right-hand tree connected to a Rockwell OPC server. Items like Turbidity, Flow, and Level are available in their respective structures.

Bridging is done by dragging a source item and dropping it onto a destination item. Once published, OPC Expert connects to both servers and begins transferring data dynamically.

This works across:

• OPC DA → OPC DA
• OPC DA → OPC UA
• OPC UA → OPC UA
• OPC UA → OPC DA

No middleware. No scripting.

Failures are visible immediately.

In the image above, the log shows:

• Lost connection to Siemens OPC server
• Error codes indicating communication problems

In a traditional setup, that’s the moment your data flow stops.

With OPC Bridge, monitoring is built in. The system:

• Detects the connection loss
• Attempts to reconnect automatically
• Maintains communication with other servers

Multi-threaded operation ensures that if one server fails, it does not drag down other connections.

Redundancy is where OPC Bridge becomes critical infrastructure—not just a convenience feature.

Built-in redundancy allows OPC Expert to automatically fail over to a standby data source when the primary source becomes unavailable.

That means:

• If the primary OPC server crashes
• If the computer hosting it reboots
• If a VM host fails
• If a network segment drops

OPC Bridge can switch to a configured standby server and continue writing data to the destination without manual intervention.

From the perspective of your SCADA system, historian, or PLC target, the data stream remains intact.

No operator action required.

Above, you can see active subscriptions with updated values after reconnection:

• Turbidity
• Flow
• Instrument → Level

The log confirms subscriptions and resumed communication.

This demonstrates a key point: failover isn’t theoretical. It’s observable and verifiable in real-time within OPC Expert.

And because monitoring runs in separate threads, reconnection attempts don’t block other communications.

Redundancy is meaningless if the application itself stops running.

In the image below, OPC Expert is configured to run as a Windows service. This means:

• It starts when Windows starts
• It runs even if no user logs in
• Data transfer continues during user logoff

The Bridge Server process continues operating independently of the UI.

For plants running 24/7, this is non-negotiable.

Hardware failure isn’t the only risk. Firewalls and security devices sometimes block asynchronous callbacks.

OPC Bridge automatically compensates by switching communication modes from asynchronous polling to synchronous polling if needed.
Most applications fail when callbacks are blocked.

OPC Bridge adapts.

If you’re designing for reliability, here’s a practical approach:

1. Configure a primary OPC source.
2. Configure a standby OPC source (on a separate machine or VM).
3. Set up redundant bridging.
4. Run OPC Expert as a Windows service.
5. Validate failover by simulating a primary shutdown.
6. Monitor logs for automatic switching.

Because OPC Expert does not require installation or registry changes, it can be tested safely in production environments.

That lowers risk during commissioning.

Built-in redundancy is not a “nice-to-have” feature. It’s essential in:

• Manufacturing lines
• Utilities and water treatment
• Power generation
• Oil & gas
• Remote pumping stations
• SCADA-to-historian integrations

Anywhere that data loss means production loss.

OPC Bridge is not just about moving data between OPC servers.

It’s about ensuring that data keeps moving—even when infrastructure fails.

Through:

• Automatic fault detection
• Multi-threaded communication
• Redundant failover to standby sources
• Windows service operation
• Security barrier compensation

OPC Bridge protects industrial systems from avoidable downtime.

For automation engineers and system integrators, that translates directly into improved uptime, reduced troubleshooting, and more resilient architectures.

If your plant depends on OPC data and most do failover should not be optional.

It should be built in.