IO-Link solutions

• Bidirectional digital communication between IO-Link devices (e.g., sensors/actuators) and an IO-Link master, allowing both value reading and the transfer of parameters/commands.
• Standardised device data availability, typically including:
  • Process data (what the device measures/outputs)
  • Service data (device information and settings)
  • Event data (diagnostics and notifications)
• Centralised parameter management via the IO-Link master (settings can be saved and written automatically).
• Easy device replacement (plug & play) using a shared connector for power and communication, with the master restoring parameters automatically.
• Enhanced diagnostics for maintenance, enabling continuous status monitoring to detect issues earlier.
• Simple, standard wiring using a 24 V signal, with no need for shielded cables.
• Remote access and configuration, so parameters can be adjusted from the control system (PC/PLC), helping to reduce downtime.

No, IO-Link is not an Ethernet-based protocol. It is a point-to-point communication standard used at the sensor/actuator level, connecting devices directly to an IO-Link master via standard sensor cables and a 24 V supply. The master then functions as a gateway, forwarding the gathered data to higher-level systems such as PLCs and HMIs, or to industrial networks like PROFINET or EtherNet/IP.

An IO-Link master serves as the link between IO-Link devices, such as sensors and actuators, and higher-level automation systems like PLCs or industrial networks (e.g. PROFINET or EtherNet/IP). It handles device communication, retains parameter settings, and provides access to diagnostic and monitoring capabilities.

Modbus and IO-Link fulfil different roles within industrial automation systems.

• IO-Link is intended for communication at device level, specifically with sensors and actuators. It supports bidirectional data exchange, detailed diagnostics, and device parameterisation at component level.
• Modbus is a fieldbus protocol generally used at a higher system level to exchange data between controllers, HMIs, and other automation devices.

IO-Link is well suited to smart manufacturing environments where access to real-time device data, diagnostics, and fast device replacement is essential. In contrast, Modbus is typically applied in scenarios that require more straightforward data communication between control systems.

IO-Link is a point-to-point communication standard for sensors and actuators, whereas fieldbus systems operate at the controller or network level. Rather than replacing existing PLC or fieldbus architectures, IO-Link works alongside them by adding device-level data access, parameterisation, and diagnostics.

An IO-Link hub enables multiple standard digital sensors or actuators to connect through a single IO-Link port. It is particularly useful in applications with a high number of simple ON/OFF devices, as it simplifies wiring, reduces cabinet space, and still provides centralised diagnostic capabilities.

Yes. Many SMC IO-Link devices are engineered with high ingress protection ratings, such as IP65, IP67, or IP69K. This makes them well suited for demanding conditions, including washdown zones, food processing environments, and outdoor installations.