Connectivity to Modbus-enabled controllers and instruments
Connect Modbus Equipment to Modern OPC UA Applications
Bring data from Modbus-enabled PLCs, meters, drives, controllers, and field devices into OPC UA-based SCADA, HMI, MES, historian, analytics, and IIoT applications.
ModbusDevice Connectivity
OPC UAStandard Data Publishing
Tag-LevelMapping & Scaling
Modbus OPC UA Server
The MayilVeera Modbus OPC UA Server provides a structured connection between Modbus field equipment and OPC UA client applications. It reads operational data from configured Modbus devices, converts registers and coils into meaningful tags, and presents them through an OPC UA address space.
The product can be used in brownfield modernisation, protocol migration, machine connectivity, energy monitoring, and OT-to-IT integration projects where existing Modbus equipment must remain in service.
Logical Architecture
A website-level view of how the product connects sources, processing layers, diagnostics, and destination systems.
Modbus Field Devices
PLCsDrivesEnergy MetersControllersSensors
01
Modbus Communication
RTU / TCP / ASCII — as supported
02
Modbus Device Configuration
Device AddressRegister MapPolling Groups
03
Data Conversion and Mapping
Data TypesByte OrderScalingRead/Write Rules
04
OPC UA Server Layer
Address SpaceSessionsSecurityDiagnostics
OPC UA Clients
SCADAHMIMESHistorianAnalyticsIIoT Platform
Key Capabilities
Configurable register, coil, device, and tag mapping
OPC UA address-space generation
Data-type conversion and byte-order configuration
Scaling and engineering-unit conversion
Read and write configuration at tag level
Device polling and communication-status monitoring
Reconnection and exception handling
Tag-quality and timestamp handling
Diagnostic logs for Modbus and OPC UA communication
How It Works
The document flow is presented as an implementation-style process so visitors can understand the operating path quickly.
- 01
Modbus devices and their communication settings are configured.
- 02
Register or coil addresses are mapped to descriptive tags.
- 03
The server polls the configured devices according to the selected intervals.
- 04
Raw values are converted using the configured data type, byte order, scaling, and engineering units.
- 05
The converted information is published through the OPC UA server.
- 06
OPC UA applications browse, read, subscribe to, or—where enabled—write values.
- 07
Communication errors and device health are exposed through diagnostics.
Applications
Where It Fits
Connecting legacy Modbus devices to OPC UA systems
Integrating energy meters with monitoring platforms
Machine and production-data acquisition
SCADA and HMI modernisation
Connecting PLC data to historians and analytics applications
Multi-vendor equipment integration
Brownfield plant connectivity
Utility and infrastructure monitoring
Building-management data integration
Test-bench and laboratory data acquisition
Benefits
Practical Benefits
Retains existing Modbus equipment while enabling modern data access
Reduces the need for application-specific Modbus drivers
Presents raw register information as structured operational tags
Centralises device and tag configuration
Provides a common interface to multiple OPC UA consumers
Supports phased plant modernisation
Integration and Deployment
Deployment begins with a Modbus device survey covering communication type, addressing, baud rate or network settings, register maps, data types, polling requirements, and read/write permissions. OPC UA namespace design and client-security requirements are then agreed before commissioning.
The server may be positioned close to the equipment at the edge or installed on an industrial computer or server, subject to the supported operating environment.
Reliability and Security
Communication timeout and retry handling
Automatic reconnection behaviour
Per-device communication-health indication
Invalid-value and tag-quality handling
Controlled access to writable tags
OPC UA certificate and identity management, where supported
Configuration backup and restore
Event and diagnostic logging
Need Help Selecting the Right Product?
Equipment and controller make or model
Required interfaces, protocols, channels, or tag count
Operating environment and target platform
Update rate, cycle time, delivery schedule, and custom engineering needs
Do not publish price, availability, certification, warranty, protocol, electrical rating, capacity, performance, or compatibility statements until they are linked to the exact shipping SKU or software version.
Frequently Asked Questions
Can it connect Modbus equipment to an OPC UA SCADA system?
Yes, when the device’s Modbus variant, register map, data types, and required OPC UA client profile are supported.
Does it support writing from OPC UA to Modbus?
Write support should be enabled only for mapped writable points and must be confirmed in the product’s supported-function matrix.
Can it communicate with different brands of equipment?
It is intended for standards-based Modbus integration, but compatibility must be checked using the device register map and an integration test.
Modernise Your Modbus Connectivity
Share the Modbus variant, device list, register map, expected tag count, polling requirement, operating environment, and OPC UA client details. MayilVeera can assess the appropriate product configuration and integration scope.
Start Your Product Discussion