Frame Types; Figure 1: Interleaved Mode - KEB COMBIVERT G6 Programming Manual

IO-Link Interface

3.3 Frame types

The IO-Link specification defines different telegram types, which differ by the size of the
process input and process output data.
For the buildup of the communication, the master must determine the communication
parameters of the device. One of the relevant informations is the length of the process
data. Based on this information, the IO-Link master decides which type of telegram for
cyclic data exchange is used.In the phase of the communication setup the master uses
the telegram type 0.
For the cyclic communication the G6 supports the frame type 1 in the "interleaved
mode":
By that it also sent on-request data between the process data. If they are not needed,
dummy commands are transmitted. Thus, a fixed process data cycle time is realized. At
first the PD-out data are transmitted, after that the PD-in data.
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Frame sequence type „Interleave"
Process data cycle n
Process data cycle n+1
t (time)
Figure 1: Interleaved mode
CMD PI x
CHK/TYPE
ON-REQ
CMD
CHK/TYPE
PI x+2
CMD
CHK/TYPE
ON-REQ ON-REQ
CMD
CHK/TYPE
PI x+y-1
CMD
CHK/TYPE
CMD ON-REQ ON-REQ
CHK/TYPE
CMD PI x
CHK/TYPE
ON-REQ ON-REQ
CMD
CHK/TYPE
PI x+1
Cycle time
ON-REQ
PI x+3
PI x+y
PI x+1