2
0
1
7
-0
7
15
IO-Link RFID Reader, HF
Frame length: Contains the number of valid bytes of data read in the input frame.
Bytes 2 and 3 are not used and are allocated zero, because some controls such as the
Rockwell Collins controls operate on four bytes.
Read data:
Bytes 4 to 31 contain the data in hexadecimal form, which is read by the
read/write head from the read/write tag using the configured write command.
Error code:
If an error occurs (failure = true), byte 4 contains an error code.
Error string:
If an error occurs (failure = true), bytes 5 to 31 contain a human-readable
error message in ASCII format.
6.3.3
Timing
Easy mode does not support a handshake. Instead, a simple counter is implemented. The IO-
Link cycle time of the read/write head is 4 ms. The input frame is updated at least every ten
cycles. You cannot change the number of cycles for the update. Therefore, new process data
is available every 40 ms.
The image shows the basic, temporal reading behavior of the read/write head. The read bit in
the output frame is true, meaning that the read/write head reads permanently. If read/write tag
A now enters the detection range of the read/write head, the read valid bit changes from 0 to
1. Because the read/write tag leaves the detection range straight away, the read valid bit
changes after 10 cycles, i.e., after 40 ms, from 1 back to 0. Read/write tag B now enters the
detection range of the read/write head. Accordingly, its UID is read and after a further 40 ms is
available in the input frame. Since the read/write tag remains in the detection range for longer,
the read valid bit is still at 1 after 40 ms, since no change has occurred. Once read/write tag B
has left the detection range, the read valid bit changes from 1 back to 0. Read/write tag C is in
the detection range for only a very brief time. After a further 40 ms, its data becomes available
in the input frame.
6.3.4
Application Example: Easy Mode with PACTware
In this section, you will learn how to use the read/write head with IO-Link Master02-USB.
Connect the read/write head to the IO-Link master and then connect it to a PC using a USB
