Omron NJ Series

5 Designing Tasks
5-28
NJ-series CPU Unit Software User’s Manual (W501)
The execution interval and the execution time depend on the model of the CPU Unit and on the tag
data link settings. Guidelines are provided below. However, if a task with a higher execution priority
than the tag data link service is executed, the execution interval and the execution time will be longer
than the following values.
 Using the Built-in EtherNet/IP Port on the CPU Unit
 Using the CJ1W-EIP21 EtherNet/IP Unit
Execution Timing of the Tag Data Link Service
CPU Unit
Tag data link settings
Execution
interval (ms)
Execution
time (ms)
Number
of tags
Number of
connections
RPI
[ms]
NJ501- 8 1 1 1 0.02 to 0.04
4 2 1 0.02 to 0.10
32 50 1 0.02 to 0.10
NJ301- 8 1 1 1 0.03 to 0.06
4 2 1 0.03 to 0.15
32 50 1 0.03 to 0.15
CPU Unit
Tag data link settings
Execution
interval (ms)
Execution
time (ms)
Number of
tags
Number of
connections
RPI
[ms]
Send/re
ceive
NJ501- 8 1 1 Send 3 0.10
Receive 3 0.10
4 2 Send 4 0.22
Receive 4 0.13
32 50 Send 12 0.68
Receive 6 to 35 0.23 to 0.66
NJ301- 8 1 1 Send 3 0.16
Receive 3 0.16
4 2 Send 3 0.21
Receive 4 0.33
32 50 Send 15 1.05
Receive 8 to 35 0.29 to 1.85
Primary period
Task period
Execution interval of the tag data
link service
Execution interval of the
tag data link service
Task period
Interrupted.
High
Low
MC IO UPG MC IO UPG MC IO UPG MC IO UPG MC IO UPG
IO UPG
IO UPG
UPG
Execution
priority
Priority-16
periodic task
Priority-17
periodic task
Primary
periodic task
System
service
Tag data link
service