Description Of Tasks - Omron CJ - PROGRAMMING MANUAL 12-2009 Programming Manual

Description of Tasks

1-6

Description of Tasks

1,2,3...
• A card that is activated will remain activated and will be read in subse-
quent sequences. A card that is deactivated will remain deactivated and
will be skipped until it is reactivated by another card.
Earlier program:
Like a scroll
Tasks are broadly grouped into the following types:
1. Cyclic tasks (32 max.)
Tasks that will be executed once per cycle if executable. Execution can
also be disabled for cyclic tasks if required.
2. Interrupt tasks (256 max.)
Tasks that are executed when the interrupt occurs whether or not a cyclic
task is being executed. There are 5 kinds of interrupt tasks, as described
below:
Note The CS1G/H-CPU@@ (-V1) and CJ1v-CPU@@ CPU Units do not
support extra cyclic tasks, so they have only 4 kinds of interrupt
tasks.
a) Power OFF interrupt task (Not supported by CS1D CPU Units for Du-
plex-CPU Systems):
Executed when power is interrupted. (1 max.)
b) Scheduled interrupt task (Not supported by CS1D CPU Units for Du-
plex-CPU Systems):
Executed at specified intervals. (2 max.).
c) I/O interrupt task (Not supported by CJ1 or CS1D CPU Units for Du-
plex-CPU Systems):
Executed when an Interrupt Input Unit input turns ON (32 max.).
d) External interrupt task (Not supported by CJ1 or CS1D CPU Units for
Duplex-CPU Systems):
Executed (256 max.) when requested by an Special I/O Unit, CPU Bus
Unit, or Inner Board (CS Series only).
e) Extra cyclic tasks (Not supported by CS1G/H-CPU@@@(-V1) and
CJ1@-CPU@@@ CPU Units):
Interrupt tasks that are treated as cyclic tasks. Extra cyclic tasks are
executed once every cycle as long as they are in an executable condi-
tion.
Section 1-6
CS/CJ-series program:
Like a series of cards that can be activated
or deactivated by other cards.
Activated Deactivated
15