Skip to main content

IO-Link Protocol

Geoffrey Hunter Author


The IO-Link protocol is a point-to-point serial communication protocol which is commonly used for sensor and actuator communication in an industrial environment.

Packet Types

Process Data

Process data is sent every communication cycle (typically 2ms).

Service Data

Service data is used to send large amounts of non-periodic data at the request of the recipient.


Events are unsolicited messages that convey information such as alarm status or info.