12-4 Message Service Transmission Delay - Omron NX Series User Manual

12-4 Message Service Transmission Delay

This section describes delay time in the service processing of a CIP communications instruction.
Instruction executed.
OI UPG MC
Controller#1
Transmission path
Controller#2
Transmission
delay
Maximum transmission delay time = Send delay + System service execution time + Transmission delay + Receive delay + System service execution time
+ Variable write time + System service execution time + Transmission delay + Receive delay + System service execution time
Processes with delay time are processed within the task period of each node as shown in the above
diagram.
Delay time related to transmission lines is as below.
l Transmission Delay
The transmission delay on an Ethernet line is 50 μs or less. This delay time can be ignored.
NX-series EtherNet/IP Unit User's Manual (W627)
12 Communications Performance and Communications Load
IO UPG MC
Command generated.
System
service
Line
×
IO UPG MC
Received command interpreted.
System
service
Transmission System
Receive
System
service
delay
service delay
Line
Task period Task period
(local node) (remote node)
(Local node task period)
(Remote node task period)
OI UPG MC
System
service
×
Line
IO UPG MC
Variable written.
Response generated.
System
service
System Transmission
Variable Receive
service
delay
written. delay
Line
Task period Task period
(remote node) (local node)
Instruction completed.
OI UPG MC
Received response interpreted.
System
service
(Remote node task period)
(Local node task period)
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