Omron Sysmac NX1P2-10 1 Series, User Manual

Page: 485 / 578

15-4 Message Service Transmission Delay
This section describes delay time in the service processing of a CIP communications instruction (CIP-
Write).
OI UPG M C IO UPG M C
IO UPG M C IO UPG M C
System
service System
service
System
service System
service
Line Line
Command generated.
Received command interpreted.
Response generated.
Variable written.
Received response interpreted.
Instruction (CIPWrite) executed. Instruction completed.
OI UPG M C OI UPG M C
×
×
Controller#1
Controller#2
Transmission path
Transmission
delay
Receive
delay
System
service
Receive
delay
System
service
Variable
written.
System
service
System
service
Transmission
delay Transmission
delay
Task period
(local node) Task period
(remote node) Task period
(local node) Task period
(remote node)
Line Line
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
(Local node task period)
(Local node task period)
(Remote node task period)
(Remote node task period)
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.

Transmission Delay
The transmission delay on an Ethernet line is 50 μs or less. This delay time can be ignored.
15 Communications Performance and Communications Load
15-29
NJ/NX-series CPU Unit Built-in EtherNet/IP Port User’s Manual (W506)
15-4 Message Service T
ransmission Delay
15