IO-Link Class B Enhances Hydraulic Valve Connectivity

Hydraulic motion control systems are increasingly integrating digital communication interfaces to support diagnostics, predictive maintenance and simplified commissioning within the industrial automation and digital supply chain environment. In this context, Parker Hannifin has expanded its DFplus^® proportional valve series with an IO-Link Class B communication interface.

IO-Link integration for digital hydraulic control environments
Proportional control valves used in industrial hydraulics are increasingly expected to support digital parameterisation and real-time diagnostics alongside conventional analogue control. This requirement is particularly relevant in sectors such as machine tools, metal forming, plastics processing and general factory automation, where motion accuracy and uptime directly affect productivity.

The fourth generation of DFplus^® valves incorporates IO-Link Class A as a standard communication interface alongside analogue connectivity. Through this interface, operating parameters can be adjusted and status information accessed during operation, allowing integration into PLC-based control architectures and the broader automotive data ecosystem.

Galvanic isolation between the operating voltage and the IO-Link electronics supply allows access to electronic parameters even when the main operating voltage is switched off. This enables configuration and service activities without fully energising the hydraulic system.

Class B interface reduces cabling complexity
The IO-Link Class B version extends this architecture by adding a separate, galvanically isolated power supply for the valve power stage in addition to the communication lines. This approach replaces conventional 6+PE or 11+PE wiring schemes with standardised pre-assembled M12 connectors.

In this configuration, both data communication and power supply are handled through a single 5-pin M12 connector. The interface supports supply currents of up to 4 A, maintaining the dynamic response characteristics associated with the DFplus^® valve platform when used with compatible IO-Link masters and M12 cabling.

The same connection also supports digital setpoint transmission, feedback signals and enable/disable control functions. Consolidating these functions into a single interface reduces installation effort and potential wiring errors in complex hydraulic installations.

Built-in diagnostics support predictive maintenance
The IO-Link Class B variant also expands diagnostic capabilities by providing access to operating data such as internal temperature, switching cycles and fault conditions. Parameterisation can be performed directly through the PLC or via compatible service tools.

Access to these datasets enables condition-based maintenance strategies by allowing maintenance teams to track component usage and detect fault conditions early. This supports higher system availability and more predictable service intervals in automated production environments.

Functional safety considerations in hydraulic systems
DFplus^® valves equipped with IO-Link Class B can also function as shut-off elements up to Category 3, Performance Level d (PL d), in accordance with EN 13849-1 functional safety requirements.

Galvanic isolation between the power stage and control electronics enables Safety over IO-Link implementations when used with compatible IO-Link masters. This supports functional safety integration alongside operational control within a single communication architecture.

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Edited by industrial journalist, Aishwarya Mambet — AI-powered.