User's Manual

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Device Function
10
10.7 Data
transmission
timing
Fig. 33: Timing of data carrier recognition and data transmission
1 Data carrier in range
2 Data carrier recognized (Tag-Present LED,
Codetag-Present bit)
t1 Data read time
t2 Polling time
t3 Cycle time
In-Data: Input data
Out-Data: Output data
Process-Data-Cycle: Process data cycle
Byte a+b: Process data
x: Data required
Data read time t1:
Time until the data from a data carrier entering the read range are actually read. The read time is:
70 ms × number of parameterized data compare counts, Default = 2 (
see “Map of parameter-
izing data” on page 3
3
).
Polling time t2:
Time until it is recognized that the data carrier is no longer in the read range (polling time). The
polling time is 50 ms.
Cycle time t3:
Time between the sending of two frames. The cycle time depends on the set baud rate and the
respective Master (
see “Direct Parameter Page” on page 30)
In-Data/Out-Data:
Sending of the input data and output data. 8 frames of 2 bytes each are sent, alternating pro-
cess data and required data (x).
Process Data Cycle:
A process data cycle consists of the complete sending of the input and output data. At the
beginning of each process data cycle the current data are polled and immediately sent.
BIS L-409 IO-Link Device
Processor