Omron NJ Series User Manual

5-17
5 Designing Tasks
NJ-series CPU Unit Software User’s Manual (W501)
5-2 Task System
5
5-2-4 Event Task Execution Conditions
Example 2: Execution Condition for an Event Task Set to When Program1.curVal (INIT variable)  10
The event task is executed only once when the value of Program1.curVal changes from less
than 10 to 10 or higher.
Precautions for Correct UsePrecautions for Correct Use
The CPU Unit evaluates whether the condition expression is met before the programs that are
assigned to the primary periodic task are executed. Even if the specified value of the variable
matches the condition expression during execution of the program in the primary periodic task,
the condition is not evaluated until just before the next execution of the primary periodic task.
This means that the event task will be executed after the end of the execution of the primary peri-
odic task that follows the execution of the primary periodic task in which the value of the variable
meets the condition expression.
Event task
The event task is executed only once when
the value of the Program1.curVal variable
changes from less than 10 to 10 or higher.
High
Low
Execution
priority
Primary
periodic task
Primary period
Value of 9 is assigned to
Program1.curVal variable.
Condition expression
is not met.
Value of 10
is assigned.
Value of 11
is assigned.
Value of 9
is assigned.
Program1.curVal
9
9 10 110
MC IO UPG
MC IO UPG
MC IO UPG MC IO UPG
MC IO UPG
Not met.
Not met.
Met

Omron NJ Series Specifications

General

Program Capacity	Up to 128 MB
SD Card Slot	Yes
Power Supply Voltage	24 VDC
Motion Control	Yes
USB Ports	1
Operating Temperature	0°C to 55°C
Communication Interfaces	Ethernet/IP, EtherCAT, USB
Safety Function	Optional
Storage Temperature	-20°C to 75°C
Communication Ports	USB
Dimensions	Varies by model
Weight	Varies by model