General
The auxiliary tasks are intended for slower processing tasks. These are the least priority tasks.
It is possible to program up to four auxiliary tasks (AUX0, AUX1, AUX2 or AUX3) on the Premium TSX P57 5•• and Quantum 140 CPU 6•••• PLCs.
It is possible to program up to two auxiliary tasks (AUX0, AUX1) on the Modicon M580 BME P58 •••• PLCs.
Auxiliary tasks are not available for Modicon M340 PLCs.
Structure
The auxiliary tasks (AUX) are made up of Program Units and/or sections and subroutines.
Each section of the auxiliary task is programmed in one of the following languages: LD, FBD, IL or ST.
The SFC language is not usable in the sections of an auxiliary task.
A maximum of 64 subroutines can be programmed in the LD, FBD, IL or ST language. These are called in the task sections.
Execution
The execution of auxiliary tasks is periodic.
They are the least priority.
The auxiliary task period can be fixed from 10 ms to 2550 ms.
Control
The auxiliary tasks can be controlled by program by system bits and words:
System objects |
Description |
|---|---|
%SW2 |
Period of auxiliary task 0 |
%SW3 |
Period of auxiliary task 1 |
%SW4 |
Period of auxiliary task 2 |
%SW5 |
Period of auxiliary task 3 |
%S32 |
Activation of auxiliary task 0 |
%S33 |
Activation of auxiliary task 1 |
%S34 |
Activation of auxiliary task 2 |
%S35 |
Activation of auxiliary task 3 |
%S11 |
Watchdog error |
%S19 |
Period overrun. |
%SW36 |
Execution time (in ms) of the last cycle of auxiliary task 0 |
%SW39 |
Execution time (in ms) of the last cycle of auxiliary task 1 |
%SW42 |
Execution time (in ms) of the last cycle of auxiliary task 2 |
%SW45 |
Execution time (in ms) of the last cycle of auxiliary task 3 |
%SW37 |
Execution time (in ms) of the longest cycle of auxiliary task 0 |
%SW40 |
Execution time (in ms) of the longest cycle of auxiliary task 1 |
%SW43 |
Execution time (in ms) of the longest cycle of auxiliary task 2 |
%SW46 |
Execution time (in ms) of the longest cycle of auxiliary task 3 |
%SW38 |
Execution time (in ms) of the shortest cycle of auxiliary task 0 |
%SW41 |
Execution time (in ms) of the shortest cycle of auxiliary task 1 |
%SW44 |
Execution time (in ms) of the shortest cycle of auxiliary task 2 |
%SW47 |
Execution time (in ms) of the shortest cycle of auxiliary task 3 |