13-23
13 Communications Performance and Communications Load
NY-series Industrial Panel PC / Industrial Box PC Built-in EtherNet/IP Port User’s Manual (W563)
13-3 I
/O R
espo
n
se T
im
e in T
ag
Dat
a Lin
ks
13
13-3-2 Built-in EtherNe
t/IP Port Dat
a Processing T
ime
Here we provide an example of how to perform the tag data link calculations described earlier for the
following tag data transfers.
•
Model Numbers of Controllers for Tag Data Links
NY5
2-
•
Refreshing Task
Primary periodic task
Task period: 500
μ
s (variable access time: 2%)
•
Setting Tag Sets
1
Calculate the variable access time as shown below.
[(600 + 200 + 1,000) bytes × 0.0006
μ
s] + [(8 + 4 + 10) variables × 0.100
μ
s] + 3 × 1.40
μ
s +
6.60
μ
s = 11.28
μ
s
2
Calculate the number of data transfers.
Time required for data transfer:
“Variable access time” in step 1 = 11.28
μ
s
Variable access time set for the task: 500
μ
s
×
0.02 = 10
μ
s
Number of data transfers:
11.28
μ
s
÷
10
μ
s = 1.128 times
Thus, approximately two data transfers are required.
3
Calculate the actual time required for the data transfer.
500
μ
s
×
2 times = 1,000
μ
s
Data Processing Time Calculation Example
Tag set
Refreshing task
Number of variables
Total size of variables
Tag set A
Primary periodic task
8
600 bytes
Tag set B
Primary periodic task
4
200 bytes
Tag set C
Primary periodic task
10
1,000 bytes
Summary of Contents for Sysmac NY512-1300
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