Io-Link Protocol; Configuration In The Fieldbus; Io-Link And Your Step 7 Program - Siemens SIMATIC S7-1200 Manual

IO-Link is easy

12.4 IO-Link protocol

12.4 IO-Link protocol
The IO-Link system can exchange three types of data:
● Cyclic process data (process data inputs, outputs) → Cyclic data
● Device parameters (on-request data objects) → Acyclic data
● Events → Acyclic data
The IO-Link device only sends data after being requested by the IO-Link master to do so.
Process data is sent after the IDLE frame of the master, and the master explicitly requests
device parameter data and events.
12.5

Configuration in the fieldbus

The IO-Link master appears on the fieldbus as a normal fieldbus node and is integrated via
the appropriate device description in the relevant network configurator. These files describe
the communication properties and other properties of the IO-Link master, such as the
number of ports. They do not indicate which IO-Link devices are connected.
However, the IO-Link Device Description (IODD) has been defined for full transparent
representation of the system architecture up to the IO-Link device. With the help of the IODD
and the IO-Link configuration tool S7-PCT, you can configure which IO-Link device is
connected to which port of your IO-Link master.
See the S7-PCT help system and the S7-1200 System Manual for detailed configuration
information.
12.6

IO-Link and your STEP 7 program

The IO-Link master programs acyclic communication with an IO-Link device using the
IOL_CALL function block (FB) in your STEP 7 S7-1200 controller program. The IOL_CALL
FB indicates the IO-Link master your program uses, and which ports the master uses for
data exchange.
Visit the Siemens Industry Online Support website (http://support.automation.siemens.com)
for details on working with the IOL_CALL FB. Enter "IO-Link" in the website's search box to
access information about IO-Link products and their use.
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Manual, 03/2014, A5E02486774-AF