12.5 Synchronization with Distributed Clocks
12-10
Example of PDO Data Exchange Timing in DC Mode
•
DC Cycle Time = 1 ms, Input Shift Time = 500
μ
s
•
DC Cycle Time = 125
μ
s, Input Shift Time = 0
μ
s
Frame
U
S0
U
U
S0
S0
Master application task
Master application task
Master application task
S0
Calc and copy time
(62 μs)
Inputs Latch
Output delay
(125 μs)
Outputs Valid
Master
Slave
Network
Master user
shift time
Calc and copy time
(62 μs)
Cycle time (1C32 hex: 02 = 1 ms)
Cycle time
(1 ms)
Input delay
(500 μs)
Sync0 shift time
Shift time
(1C33 hex: 03 = 500 μs)
Frame
Frame
Sync0
event
Sync0
event
Sync0
event
Frame
U
S0
Frame
U
U
S0
S0
Master application task
Master application task
Master application task
S0
Calc and copy time (62 μs)
Inputs Latch
Output delay (125 μs)
Outputs Valid
Sync0
event
Sync0
event
Master user
shift time
Calc and copy time (62 μs)
Sync0
event
Cycle time (1C32 hex: 02 = 125 μs)
Cycle time (125 μs)
Sync0 shift time
Frame
Input delay (125 μs)
Master
Slave
Network