Task_Isactive - Omron NJ501-1500 Reference Manual

Task_IsActive

The Task_IsActive instruction determines if the specified task is currently in execution.
Instruction
Task_IsActive Determine Task
Status
Variables
Name Meaning
TaskName Task name
Out Judgement
Bit strings
TaskName
Out OK
Function
The Task_IsActive instruction determines if the task specified with TaskName is currently in execution
or on standby. "On standby" means that a high-priority task was started after this task was started, so
processing has been interrupted.
If it is being executed or on standby, the value of judgment Out is TRUE. If it is not being executed, the
value of Out is FALSE.
Precautions for Correct Use
• You cannot use a variable to which a text string was assigned for TaskName. Directly specify a text
string.
• If this instruction is used in a ladder diagram, the value of Out changes to FALSE if an error occurs in
the previous instruction on the rung.
• An error occurs in the following case. The value of Out does not change.
• The task specified with TaskName does not exist.
NJ-series Instructions Reference Manual (W502)
Name FB/FUN
FUN
I/O Description
Input Task name
Output TRUE: Task is in execution
or on standby.
FALSE: Not active
Graphic expression
(@)Task_IsActive
EN Out
TaskName
Valid range
63 bytes max. (62 sin-
gle-byte alphanumeric
characters plus the final
NULL character)
Depends on data type.
Integers
2 Instruction Descriptions
ST expression
Out:=Task_IsActive(
TaskName);
Unit Default
''
---
--- ---
Times, durations,
dates, and text strings
2
OK
2-873