Omron NJ Series User Manual

5-45
5 Designing Tasks
NJ-series CPU Unit Software User’s Manual (W501)
5-2 Task System
5
5-2-17 Errors Related to Tasks
This section describes the following errors.
• Task Period Exceeded Error
• Motion Control Period Exceeded Error
• Task Execution Timeout Error
• I/O Refreshing Timeout Error
• Insufficient System Service Time Error
A Task Period Exceeded Error occurs if the task execution time exceeds the specified task period.
This is a minor fault level Controller error. Operation continues even when this error occurs.
It can occur for the primary periodic task and periodic tasks.
You can also disable the Task Period Exceeded Errors with a setting. Use the Task Period Exceeded
Detection setting in the Task Settings of the Sysmac Studio. The default setting is to detect the error.
Even if detection of Task Period Exceeded Errors is disabled, information will be output to the following
system-defined variables if task processing is not completed within the period: Task Period Exceeded
Flag (_TaskName_Exceeded), Task Period Exceeded Count (_TaskName_ExceedCount), Controller
Error Status (_ErrSta), and the event log.
I/O is refreshed as follows according to what the I/O is for if task processing is not completed within the
task period.
*1 This includes NX Units on EtherCAT Slave Terminals.
Precautions for Correct UsePrecautions for Correct Use
If the Task Period Exceeded Error occurs, shorten the programs to fit in the task period or
increase the setting of the task period.
5-2-17 Errors Related to Tasks
Task Period Exceeded Error
Error name Error level Correction
Task Period Exceeded
Error
Minor fault Review the task settings and programs and download the
project again.
Reset the error from the Sysmac Studio.
I/O is for
I/O refresh operation if task processing is not completed within the task
period
EtherCAT slave
*1
Outputs: The values from the previous period are output.
Inputs: Inputs are refreshed, but the input data is not updated in the executed user
program.
CJ-series Unit I/O is not refreshed until execution of the task is completed.
IO
UPG MC
UPG
MC
IO
IO
IO
UPG MC
Task period
Task Period Exceeded
Error occurred.
Task period
Task period
Task period
Primary
periodic task

Omron NJ Series Specifications

General

Brand	Omron
Model	NJ Series
Category	Controller
Language	English