13 Communications Performance and Communications Load
13-22
NY-series Industrial Panel PC / Industrial Box PC Built-in EtherNet/IP Port User’s Manual (W563)
This section describes the data processing time required to transfer data between the built-in Ether-
Net/IP port and the Controller.
The time required for data processing consists of the following three elements.
1. Variable Access Time
First, calculate the time required to transfer tag data (or the time required to access variables).
This calculation is performed for each task. Therefore, if the same refreshing task is set for multiple
tag sets, calculate the total time required for all tags in the tag sets.
Use the following equation to calculate the variable access time.
Variable access time [
μ
s] = Total size of variables [bytes]
×
a + Number of variables
×
b
+ Number of accesses
×
c + d
Number of accesses: Number of tag sets
a to d: Constant values as given below
2. Number of Data Transfers
Tag data is transferred as a part of task processing.
If the time required to process the data transfer is greater than the "variable access time"
*2
, the data
cannot be sent entirely in one task period and is sent separately instead.
Number of data transfers = "Time required to send the data entirely"
*1
÷ "Variable access time"
*2
set for the task
*1 This is the variable access time as calculated in step 1 above.
*2 The "variable access time" refers to the maximum processing time for accessing variables. Set the time for
each task on the Task Setup Display, which is displayed by selecting
Configurations and Setup
-
Task Setup
in the Sysmac Studio.
Precautions for Correct Use
Precautions for Correct Use
The maximum number of tag data link words that can be transferred through the built-in Ether-
Net/IP port is 92,416 words. If the number of tag data link words exceeds the number of words
that can be exchanged with the Controller at one time, the data is divided and transferred in mul-
tiple data exchanges.
3. Actual Time Required for Data Transfer
You can use the task period of the refreshing task and the number of data transfers as calculated in
(2) above to calculate the actual time required to transfer the data.
Task period
×
Number of data transfers
13-3-2 Built-in EtherNet/IP Port Data Processing Time
Data Processing Time Overview
Controller model
Constant value [
μ
s]
a
b
c
d
NY5
2-
0.0006
0.100
1.40
6.6
Summary of Contents for Sysmac NY512-1300
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