Omron SYSMAC CJ1W-EIP21, Operation Manuals

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12-25
12 Communications Performance and Communications Load
CJ-series EtherNet/IP Units Operation Manual for NJ-series CPU Unit (W495)
12-3 I
/O R
espo
n
se T
ime in
T
a
g
Data Lin
ks
12
12-3-4 Ma
xim
u
m T
ag Da
ta
Lin
k
I/O Response Time
You can find the maximum I/O response time from the total of (1) to (6) in the following figure.
Additional Information
• With unit version 1.03 or later, processing for tag data links is executed in the tag data link ser-
vice.
• With unit version 1.01 to 1.02, processing for tag data links is executed in the system services.
If a tag data link timeout occurs, reconsider the execution time for system services.
(1) Input ON Response Time
This is the delay time for the external input device from when the input occurs until the switch actu-
ally 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 of each device for the input switch delay time. Also, one task period is
required until the data is stored in the memory area of the CPU Unit. Therefore, the input ON
response time is obtained as shown below.
Input ON response time = Input device delay time + Task period
12-3-4 Maximum Tag Data Link I/O Response Time
(1)
(2) (3)
O
u
tp
u
t
de
v
ice
Inp
u
t de
v
ice
Transmission
path
Controller
#1
Controller
#2
Input
Output
(1) Input ON
response time
Tag data link I/O response time
(2) Send data
processing time
(5) Receive data processing time
(6) Output ON
response time
(3) RPI
(4) Network transmission delay time
Controller #2 processing
Task period
Task period
System Common Processing 2
I/O refreshing (data link processing)
User program execution
Motion control
Task periods for the number of data transfers
I/O refreshing time
Example: Data is transferred in three task processing periods.
I/O refreshing
time
Tag data link
refresh period
OI UP
G
MC OI UP
G
MC OI UP
G
MC OI UP
G
MC
OI UP
G
MC OI UP
G
MC OI UP
G
MC OI UP
G
MC OI UP
G
MC
MC
OI
UPG
Controller #1 processing
Task periods for the number of data transfers
Tag data link service
Tag data link service