
Distributed Clocks
I-58 Slave Controller – Technology
9.1.6 Reference between DC Registers/Functions and Clocks
Table 30: Reference between DC Registers/Functions and Clocks
Receive Time ECAT
Processing Unit
ECAT:
Local copy of System Time when frame
passed Reference Clock
(t
Local time
+ t
Offset
– t
Propagation delay
)
PDI:
Local copy of System Time (t
Local time
+ t
Offset
)
Local copy of System Time (t
Local time
+ t
Offset
)
Local copy of System Time (t
Local time
+ t
Offset
)
Latch0 Time Positive Edge
Local copy of System Time (t
Local time
+ t
Offset
)
Latch0 Time Negative Edge
Local copy of System Time (t
Local time
+ t
Offset
)
Latch1 Time Positive Edge
Local copy of System Time (t
Local time
+ t
Offset
)
Latch1 Time Negative Edge
Local copy of System Time (t
Local time
+ t
Offset
)
EtherCAT Buffer Change
Event Time
PDI Buffer Start Event Time
PDI Buffer Change Event
Time
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