Iec 61131-3 Second edition 2003-01 Programmable controllers – Part 3: Programming languages

Table 50 - Task features
No.
Description/Examples
1a
Textual declaration of periodic TASK (feature 5a of table 49)
1b
Textual declaration of non-periodic TASK (feature 5b of table 49)
Graphical representation of TASKs (general form)
TASKNAME
+---------+
| TASK |
BOOL---|SINGLE |
TIME---|INTERVAL |
UINT---|PRIORITY |
+---------+
2a
Graphical representation of periodic TASKs
SLOW_1 FAST_1
+---------+ +---------+
| TASK | | TASK |
|SINGLE | |SINGLE |
t#20ms---|INTERVAL | t#10ms---|INTERVAL |
2---|PRIORITY | 1---|PRIORITY |
+---------+ +---------+
2b
Graphical representation of non-periodic TASK
INT_2
+---------+
| TASK |
%IX2---|SINGLE |
|INTERVAL |
1---|PRIORITY |
+---------+
3a
Textual association with PROGRAMs (feature 6a of table 49)
3b
Textual association with function blocks (feature 6b of table 49)
4a
Graphical association with PROGRAMs
RESOURCE STATION_2
P1 P4
+-------+ +-------+
| F | | H |
| | | |
| | | |
+-------+ +-------+
| PER_2 | | INT_2 |
+-------+ +-------+
END_RESOURCE
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61131-3 
 IEC:2003(E)
– 117 –
Table 50 - Task features
No.
Description/Examples
4b
Graphical association with function blocks within PROGRAMs
RESOURCE STATION_1
P2
+---------------------------------------------------+
| G |
| |
| FB1 FB2 |
| +------+ +------+ |
| | A | | B | |
| | | | | |
| | | | | |
| +------+ +------+ |
| |SLOW_1| |FAST_1| |
| +------+ +------+ |
+---------------------------------------------------+
END_RESOURCE