System variables and status information
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8.5 IEC-61131 runtime system
There is a separate group of system variables for the IEC 61131 runtime system.
Table 8-5 System variables for the IEC 61131 runtime system
System variable Type Meaning
PLCMODE_ON BOOL PLC status ON:
The runtime system on the controller is operational.
PLCMODE_LOADING BOOL PLC status LOADING:
The application program is loading.
PLCMODE_RUN BOOL PLC status RUN:
The application program is running.
PLCMODE_STOP BOOL PLC status STOP:
The application program is currently not running.
PLCMODE_HALT BOOL PLC status HALT:
The application program was stopped at an unspecified point.
PLCDEBUG_BPSET BOOL Breakpoint set:
At least one breakpoint has been set in the application program.
PLCDEBUG_FORCE BOOL Variable(s) forced:
At least one variable is being continuously overwritten (forced).
PLCDEBUG_POWERFLOW BOOL In “Powerflow” mode, you can see which parts of your applica-
tion program are being processed.
0: Powerflow disabled/off
1: Powerflow enabled/on
PLC_TICKS_PER_SEC INT System ticks per second:
The number of pulses the system clock of the controller delivers
per second.
PLC_SYS_TICK_CNT DINT Number of system ticks:
The total number of pulses delivered by the system clock since
the last startup.
PLC_TASK_AVAILABLE INT Number of available PLC tasks
PLC_SYSTASK_AVAILABLE INT Number of available system tasks
PLC_MAX_ERRORS DINT Maximum number of “errors, warnings, and logging events”.
If the maximum number is reached, the controller is stopped.
PLC_ERRORS DINT Number of “errors, warnings, and logging events” currently en-
tered.
PLC_TASK_DEFINED INT Number of tasks used
PLC_TASK_1 RECORD Information regarding task 1
:::
PLC_TASK_8 RECORD Information regarding task 8
CLOCK_PULSE_1S BOOL 1 s clock pulse
CLOCK_PULSE_2S BOOL 2 s clock pulse
CLOCK_PULSE_5S BOOL 5 s clock pulse
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