6 User Program System Manual Modular Systems
Page 38 of 114 HI 800 191 E Rev. 2.02
1. Multitasking Mode 1 uses the unneeded time to reduce the CPU cycle. If the user program
is completely processed, processing of the next user program begins immediately. In total,
this results in a shorter cycle.
Example: 3 user programs (Prg 1, Prg 2 and Prg 3) that allow a user program cycle to take
up to 3 CPU cycles.
First CPU cycle considered.
Second CPU cycle considered.
Third CPU cycle considered.
Max. Duration for Each Cycle [µs] of
Prg 1 has expired, Prg 2 starts.
Max. Duration for Each Cycle [µs] of
Prg 2 has expired, Prg 3 starts.
Max. Duration for Each Cycle [µs] of
Prg 3 has expired, completion of the first
CPU cycle.
Completion of the Prg 1 cycle, Prg 2 is
resumed.
Completion of the Prg 2 cycle, Prg 3 is
resumed.
Max. Duration for Each Cycle [µs] of
Prg 3 has expired, completion of the
second CPU cycle.
The next user program cycle of Prg 1
starts.
Max. Duration for Each Cycle [µs] of
Prg 1 has expired. The next user program
cycle of Prg 2 starts.
Max. Duration for Each Cycle [µs] of
Prg 2 has expired, Prg 3 starts.
Completion of the Prg 3 cycle.
Figure 5: Multitasking Mode 1
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