Chapter 13 IO-Link Communication Module AS04SIL
13-9
13.3
Functions
AS04SIL-A supports the IO-Link devices when it works as the IO-Link master. Between the master and the devices is the
point-to-point connection adopting the reliable 3-wire technology and the unshielded standard cable to connect intelligent
sensors/actuators which function as IO-Link devices. AS04SIL-A is compatible with traditional digital sensors/actuators.
The designs for circuit status and data channels are both based on the reliable 24VDC technology.
13.3.1
Basic Functions
13.3.1.1 Cyclic Communication Function
I/O data (process data) in the IO/Link devices is cyclically exchanged with the IO-Link master module which operates as
the IO-Link communication master. Meanwhile as the extension module of the upper device, AS04SIL-A can cyclically
update the device data and status of the IO-Link master to the upper device.
For example, users can use cyclic communications to check the amount of incident light for photoelectric sensors, stability
detection margins, and excessive proximity for proximity sensors, etc. as well as detect the amount of performance
deterioration in devices and changes in usage conditions.
There are three modes for cyclic communications:
(1) Asynchronous: AS04SIL-A and IO-Link device defines the cycle time for each port and uses the shortest update cycle
time.
(2) Fixed Value: the system uses what you have set for the update cycle time here. The value here should be within the
cycle time range of the connected device and the minimum value should be a number bigger than the shortest cycle
time that the connected device supports.
(3) Synchronization: AS04SIL-A defines the update cycle time for all the selected communication ports synchronously.
(You need to select at least two ports.) Since different device supports different update cycle time, the system uses
the biggest time among all the shortest cycle times to have every device covered.
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