WAGO-I/O-SYSTEM 750
Programming the PFC using WAGO-I/O-PRO 151
750-880, 750-880/025-000 ETHERNET Programmable Fieldbus Controller
Manual
Version 1.0.1
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To cyclic tasks applies:
Note
Cyclic tasks with > 30 min. call intervals not possible!
Cyclic tasks with a call interval of more than 30 minutes are not possible.
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9.4.1
IEC Task Sequence
1.
Determine the system time (tStart).
2.
If no full internal bus cycle has run since the last time the outputs were
written:
Wait until the next internal bus cycle is completed.
3.
Reading of inputs and reading back of the outputs from the process image.
4.
If the application program has been started.
Execute the program codes for this task.
5.
Writing of the outputs to the process image.
6.
Determine the system time (tEnd).
tEnd - tStart = runtime for the IEC task
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9.4.2
Overview of Most Important Task Priorities
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Table 45: Task processing
Task
Importance of the execution
Internal bus task, fieldbus task
of priority before all others
Normal task
after the internal bus and fieldbus tasks
PLC-Comm task
after the normal tasks
Background task
after the PLC-Comm tasks
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I/O Bus Task / Fieldbus Task (Internal)
The I/O Bus task is an internal task, which updates the I/O module data from the
process image. Fieldbus tasks are triggered by fieldbus events (communications);
therefore, they only use processing time when the fieldbus is active
(MODBUS/Ethernet/IP).
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Normal task (IEC tasks 1-10)
IEC tasks with this priority may be interrupted by the internal bus tasks.
Therefore, configuration for the connected modules and communication via
fieldbus with the watchdog activated for the task call interval must be taken into
account here.