Lenze DDS Target 9300 Servo PLC V8.x - Manual (Page 103)

9300 Servo PLC
System blocks
2.15 SYSTEM_FLAGS (system flags, node number 151)
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9300 Servo PLC EN 5.1
2.15 SYSTEM_FLAGS (system flags, node number 151)
System flags are global variables which are permanently integrated into the run−time system. They
include functions that facilitate programming.
2.15.1 Inputs SYSTEM_FLAGS
The following system flags are included in the DrivePLC:
Variable Data type Address Notes
SYSTEM_bClock01Hz
Bool
%IX151.0.0 0.1 Hz system clock
SYSTEM_bClock1Hz %IX151.0.8 1.0 Hz system clock
SYSTEM_bClock10Hz %IX151.1.0 10 Hz system clock
SYSTEM_bClock0100Hz %IX151.1.8 100 Hz system clock
SYSTEM_bTogCycleTask %IX151.2.0 Toggle flag cyclic task
SYSTEM_b1LoopCyclicTask %IX151.2.8 First loop cyclic task
SYSTEM_b1LoopTask2 %IX151.3.0 First loop task ID2
SYSTEM_b1LoopTask3 %IX151.3.8 First loop task ID3
SYSTEM_b1LoopTask4 %IX151.4.0 First loop task ID4
SYSTEM_b1LoopTask5 %IX151.4.8 First loop task ID5
SYSTEM_b1LoopTask6 %IX151.5.0 First loop task ID6
SYSTEM_b1LoopTask7 %IX151.5.8 First loop task ID7
SYSTEM_b1LoopTask8 %IX151.6.0 First loop task ID8
SYSTEM_b1LoopTask9 %IX151.6.8 First loop task ID9
SYSTEM_nTaskInterval
Integer
%IW151.7 Interval of current task
SYSTEM_nTaskID %IW151.8 ID−number of current task
Tip!
The system variables are not generated in simulation mode.
SYSTEM_bClockxHz
These system flags output a fixed clock pulse with an equal pulse/pause ratio.
·
The flag is toggled in real time.
·
When you use this system flag, take care with the frequency used for polling the flag (aliasing
effect). You should use at least twice the toggle frequency.
Note!
The system flags SYSTEM_bClockxHz must not be used to trigger event−controlled tasks. Use
time−controlled tasks for this.
Example:
You would like to use the system flag SYSTEM_bClock100Hz as a clock for a counter.
·
The pulse/pause ratio is 5 ms/5 ms.
·
To avoid an aliasing effect, the counter must always be polled with an INTERVAL TASK < 5 ms.