5 Programming HIMax System
HI 801 001 E Rev. 4.01 Page 70 of 122
Parameter Description Configurable for
Max. Duration
for Each Cycle
[µs]
Time permitted for executing the user program
within a CPU cycle.
User program, Multitask-
ing Editor
Program ID
ID for identifying the program when displayed in
SILworX
User program, Multitask-
ing Editor
Watchdog
Time
Resource Watchdog Time Resource
Target Cycle
Time [ms]
Required or maximum cycle time Resource
Use of the execution duration unneeded by the
user program, e. g., the difference between ac-
tual execution duration in one CPU cycle and the
defined Max. Duration for Each Cycle [µs].
Mode 1
The duration of a CPU cycle is based
on the required execution time of all
user programs.
Mode 2
The processor provides user programs
with a higher priority the execution time
not needed by user programs with a
lower priority. Operation mode for high
availability.
Multitasking
Mode
Mode 3
The processor waits for the unneeded
execution time of user programs to ex-
pire and thus increases the cycle.
Resource, Multitasking
Editor
Target Cycle
Mode
Use of Target Cycle Time [ms] Resource
Priority Importance of a user program; highest priority: 0. Multitasking Editor
Maximum
Number of Cy-
cles
Maximum number of CPU cycle required to
process one user program cycle.
Multitasking Editor
Table 23: Parameters Configurable for Multitasking
Observe the following rules when setting the parameters:
If Max. Duration for Each Cycle [µs] is set to 0, the execution time of the user program is
not limited, e.g., it is always processed completely. Therefore, the number of cycles may
be set to 1 in this case.
The sum of the Max. Duration for Each Cycle [µs] parameters in all user programs must
not exceed the resource watchdog time. Make sure that sufficient reserve is planned for
processing the remaining system tasks.
The sum of the Max. Duration for Each Cycle [µs] parameters in all user programs must
be large enough to ensure that sufficient reserve is available to maintain the target cycle
time.
The Program IDs of all user programs must be unique.
During verification and code generation, SILworX monitors that these rules are observed.
These rules must also be observed when modifying the parameters online.
SILworX uses these parameters to calculate the user program watchdog time:
User program watchdog time = watchdog time * maximum number of cycles
i
The sequence control for executing the user programs is run in cycles of 250 µs. For this
reason, the values set for Max. Duration For Each Cycle [µs] can be exceeded or under-run
by up to 250 µs.
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