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59
The sequence of the IO-Link communication is shown in the following diagram. Exchange alter-
nates between the input buffer and the output buffer. As soon as current data is pending in one
of the buffers, it is exchanged on the next input or output data cycle. The problem arises here
that the transmission times can vary greatly. If data is updated shortly before the start of the
respective exchange cycle, the transfer lasts just over 1 x cycle time. If, however, data is updated
shortly after the start of an exchange cycle, it lasts a maximum of 2 x cycle time.
The processing sequence of a command is shown on the next page using a read job of 9…16
bytes (2 x input buffer for read data) as an example.
Temporal relationship between primary bus system, IO-Link transmission and trans-
mission time
Assumption:
– Cycle time of bus system 4 ms (t1)
– Cycle time of IO-Link 8 ms (t2)
– Data transmission from the controller to the IO-Link device
Best case:
New data
4 ms
8 ms
IN
OUT
OUT
IN
Bus system
IO-Link
Transmission time ≈ t
1
+ 1/2 t
2
Worst case:
New data
4 ms
8 ms
IN
OUT
IN
OUT
IN
OUT
Bus system
IO-Link
Transmission time ≈ t
1
+ 1.5 t
2
There is an offset between the bus system and IO-Link because the bus system and IO-Link
operate independent of one another (not synchronous).
9.6 Data
Transmission
Timing
9
Device Function
BIS M-4 _ _ IO-Link Device
Read/Write Device
Содержание BIS M-4 045 0 07-S4 Series
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Страница 3: ...Technische Beschreibung Betriebsanleitung deutsch BIS M 4_ _ 045 _0_ 07 S4 BIS M 4_ _ 072 _0_ 07 S4...
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Страница 69: ...Technical Description Operating Manual english BIS M 4_ _ 045 _0_ 07 S4 BIS M 4_ _ 072 _0_ 07 S4...
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Страница 138: ...4 BIS M 4_ _ IO Link 7 43 7 1 43 7 2 44 7 3 45 8 46 9 47 9 1 47 9 2 48 9 3 52 9 4 53 9 5 58 9 6 59 62 62 62 ASCII 63...
Страница 139: ...www balluff com 5 8 UL 3TLJ E227256 IC RSS 1 2 FCC FCC 15 1 2 BIS M 4_ _ IO Link 1 1 1 2 1 BIS M 4_ _ IO Link...
Страница 141: ...www balluff com 7 1 BIS CRC DPP EMC LSB MSB PC SIO IO SPDU PLC TCP 1 6 1 7 BIS M 4_ _ IO Link...
Страница 142: ...8 BIS M 4xx_ _ BIS M EMC A IO Link BIS M 4_ _ 24 A 2 1 2 2 2 3 2 BIS M 4_ _ IO Link...
Страница 152: ...18 3 IO Link M12 A 1 24 V 2 3 GND 4 C Q 2 2 2 IO Link IO Link RC 3 2 BIS M 4_ _ IO Link...
Страница 153: ...www balluff com 19 BIS M BIS M IO Link 16 1 IO Link 2 3 4 IO Link IO Link PC PLC 4 1 4 BIS M 4_ _ IO Link...
Страница 156: ...22 4 CRC_16 CRC_16 CRC_16 CRC_16 CRC 23 CRC_16 44 7 2 8 BIS M 4_ _ 045 30 BIS M 4_ _ 072 4 5 4 6 BIS M 4_ _ IO Link...
Страница 180: ...46 IO Link BIS M IO Link 10 BIS M 4_ _ 045 00_ 07 S4 32 BIS M 4_ _ 072 00_ 07 S4 8 BIS M 4_ _ IO Link...
Страница 192: ...58 01hex 02hex 03hex 04hex 05hex 07hex AV 00hex 0Ehex CRC CRC 0Fhex 48 20hex 21hex AV 9 5 9 BIS M 4_ _ IO Link...
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