WAGO I/O SYSTEM 750 XTR Run-time System CODESYS 2.3 257
750-8202/040-000 PFC200 2ETH RS XTR
Manual
Version 1.2.0, valid from FW Version 03.01.07(13)
8.4.1 Cyclic Tasks
You can assign a priority for each task in order to establish the task processing
sequence.
Figure 75: Cyclic Task
Order of Task Processing
The priorities given below do not specifiy the order of task processing. The tasks
start in an arbitrary order.
Priority 0 … 5:
Important arithmetic operations and synchronized access to I/O module process
images are to be carried out as tasks with the highest priorities 0 … 5. These
tasks are processed fully according to priority and correspond to Linux
®
RT
priorities
-79 through -74.
Priority 6 … 20:
Real-time access, such as access to ETHERNET and the file system, to fieldbus
data and to the RS-232 interface (when available) are to be carried out as tasks
with average priorities 6 … 20. These tasks are processed fully according to
priority and correspond to Linux
®
RT priorities -40 through -26.
Priority 21 … 31:
Applications such as long-lasting arithmetic operations and non-real-time-
relevant access to ETHERNET and the file system, to fieldbus data and the RS-
232 interface (when provided) are to be carried out as tasks with the lowest
priorities 21 … 31. No prioritiy distinction is made between tasks of priorities 21
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