OI
UP
G
MC
OI
UP
G
MC
OI
UP
G
MC
OI
UP
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MC
OI UP
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MC OI UP
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MC OI UP
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MC OI UP
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MC
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UPG
RPI
RPI
Tag data link I/O response time
Data link processing (system
common processing 2)
Motion control
User program execution
I/O refreshing
Output
device
Input device
Transmission
path
CPU Unit #1CPU Unit #2
EtherNet/IP
Unit #1
EtherNet/IP
Unit #2
(3) Network transmission delay time
(1) Input ON response time
(5) Output ON
response time
(4) Receive data processing time
(2) Send data processing time
Task period
Input
Example: Primary periodic task
CPU Unit #1 processing
CPU Unit #2 processing
Task period
Output
1.
Input ON Response Time
The input ON response time contains the delay time for the external input device from when the
input occurs until the switch actually changes to ON and the time until the input data is stored in
the memory area of the CPU Unit. Refer to the input delay information of the device for input
switch delay time.
One task period is required until the input data is stored in the memory area of the CPU Unit. Ac-
cordingly, the input ON response time is calculated as below
.
Input ON response time = Input device delay time + Task period
2.
Send Data Processing Time
This is the time required to transfer a variable from the CPU Unit to the EtherNet/IP port on the NX-
series EtherNet/IP Unit.
12 Communications Performance and Communications Load
12-24
NX-series EtherNet/IP Unit User's Manual (W627)