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COMBICONTROL
6.4
System variables
The following system variables are available in the PLC program:
SYSAXISMODE
Displays the axes control mode adjusted via the function block 'tSetModes'.
SYSERRORAXIS
Displays the failed monitored or cyclic/synchronous operated axes. In case of failure of an
axis the red error LED at the operating unit is switched on and the event "excpt_axis_error"
is released (if this event is activated). Then the control program can evaluate the defective
axes in SYSERRORAXIS. Additionally this condition is displayed in parameter ru.03.
SYSCYCLETIME
Displays the axes control mode adjusted via the function block 'tSetModes'. Value 0 means
that NO cycle time monitoring takes place and the PLC program is running free with a mini-
mum of 1 ms. The cycle time determines the fixed time interval the PLC program needs for
one cycle and into which the process data are exchanged with the axes during cyclic/syn-
chronous operation.
SYSERRORCYCLETIME
The red error LED at the operating unit is switched on, when exceeding the adjusted cycle
time. Event "excpt_cycle time_overflow" is released (if this Event is activated) and the system
variable SYSERRORCYCLETIME is set on TRUE. Additionally this condition is displayed in
parameter ru.00.
SYSWATCHDOGMAX
Determines the max. watchdog time in n*44ms. Standard value is 3, that means the program
watchdog is adjusted to 132ms.
SYSERRORWATCHDOG
If a cycle of the PLC program needs longer than the maximum watchdog time (e.g. by a
endless loop), then the system variable SYSERRORWATCHDOG is set to TRUE and the
program is interrupted (PLC is on stop then). Additionally this condition is displayed in para-
meter ru.00.
SYSFIELDBUSSTATE
Displays the link state of the optional field bus module.
Profibus DP
GB - 30
0 h
no connection
20 h
Connection OK, data transfer runs
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