WAGO I/O SYSTEM 750 XTR Run-time System CODESYS 2.3 275
750-8202/040-000 PFC200 2ETH RS XTR
Manual
Version 1.2.0, valid from FW Version 03.01.07(13)
Table 208: Local Bus (KBus) Settings
Update mode
The update mode is used to configure how the local bus process
data is to be updated (refreshed).
Asynchronous
In the asynchronous update mode process data
are refreshed in cycles at a definable interval.
Synchronous
*
In the synchronous update mode the process
data are synchronized with the most rapid
CODESYS task that accesses the local bus.
KBus cycle
time
The update interval for the local bus is set by the cycle time. This
setting is effective only in the asynchronous mode.
Minimum value 1 millisecond
Default value 10 milliseconds
Maximum value 50 milliseconds
KBus thread
priority
This value indicates the priority for the local bus thread. This
setting is effective only in the asynchronous mode.
This priority is equivalent to the priority of the cyclic CODESYS
tasks (see section “Cyclic Tasks”).
behavior
Specifies the response of the local bus outputs when the PLC
application stops.
The output states are retained.
8.9.5.1 Effect of Update Mode on CODESYS Tasks
8.9.5.1.1 Asynchronous Update Mode
In the asynchronous update mode there is no direct influence on CODESYS task
behavior.
Local bus “freeze” on priority conflicts!
In the asynchronous update mode there is a risk of the local bus “freezing”, as
the local bus thread operates at the same priority as the IEC tasks. The local
bus thread must therefore use a priority higher than that of the IEC task to
prevent this from occurring.
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