The Multi-Task System
Operating Manual XCA 1100 / XCA 1200
●
Version 12/17
125
No.
Name
Event
Actions
SPG 17
CPU_OVERLOAD
Is executed if a CPU overload
occurs
User tasks are deactivated
All outputs are updated
The close function of the I/O driver is
executed
PLC switches to STOP
SPG 18
INITIODRV_ERR
Is executed if an error occurs
in I/O driver initialization during
a cold or warm start
PLC does not start
SPG 19
BOUNDS_ERR
Is executed if the limits of an
array or a structure are
exceeded. Is only executed if
the “Index-Prüfung” [“Index
check”] or “Feldbegrenzungs-
Prüfung” [“Array limit check”]
checkbox in the “Ressource ...
einrichten” [Resource ... Set
up] dialog in MULTIPROG was
activated.
User tasks are deactivated
All outputs are updated
The close function of the I/O driver is
executed
PLC switches to STOP
SPG 20
BUS_ERR
Is executed if variables with a
data type
2 bytes and
uneven addresses were used
or an internal error has
occurred in MULTIPROG. Only
on Motorola platforms.
User tasks are deactivated
All outputs are updated
The close function of the I/O driver is
executed
PLC switches to STOP
SPG 21
STRING_ERR
Is executed if an error has
occurred in a character string
operation, e.g. if one character
string is to be replaced by
another, but cannot be found.
The behaviour of a character string
exception has changed! In the standard
setting SPG 21 is called after a character
string exception has occurred. An entry
with the module number and line number
is also made in the error catalogue. The
PLC remains in “RUN” status.
Table 39: The Multi-Tasking system, system tasks
Note
System tasks are not monitored by the watchdog.