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Sdci standard notes2/2/2024 ![]() The so-called SPDU index is used to address the corresponding parameter. TwinCAT currently only supports access via ADS. The PLC must explicitly query or, when marked as such, send these acyclic service data. Parameter data exchangeĪn intelligent IO-Link device can support parameterization through SPDUs (service protocol data units). The connected IO-Link devices have individual parameter information in the form of an IO device description (IODD), which is set with the KS2000 configuration software (see chapter KS2000 - Settings). Therefore, IO-Link is not a fieldbus, but a peer-to-peer connection (see Fig. One IO-Link device can be connected to each of them. The Beckhoff EL6224 IO-Link Master Terminal has four IO-Link ports. The IO-Link master provides the interface to the higher-level controller and controls communication with the connected IO-Link devices. The new designation SDCI will be introduced at the same time.Īs a member of the respective committee, Beckhoff supports the development of IO-Link and reflects changes to the specification in its products.Īn IO-Link system consists of an IO-Link master and one or more IO-Link devices, i.e. At the time of the preparation of this documentation, the IO-Link specification is entering the IEC standardization and will be adopted in extended form as IEC 61131-9. The development of the EL6224 was subject to the IO-Link specification 1.1. IO-Link represents a communication system for the connection of intelligent sensors and actuators to an automation system in the IEC 61131-9 standard under the designation "Single-drop digital communication interface for small sensors and actuators" (SDCI).īoth the electrical connection data and the communication protocol are standardized and summarized in the IO-Link Spec.
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