WAGO-I/O-SYSTEM 750
Run-time System CODESYS 2.3 257
750-8207 PFC200 CS 2ETH RS 3G
Manual
Draft version 1.2.1 from 2017-09-13, valid from FW Version 02.06.20(09)
8.9.2
Case 2: CODESYS Task Interval Smaller than Twice the
Internal Data Bus Cycle
Execution of the internal data bus is synchronized with the set CODESYS task
interval.
At the end of the CODESYS task, the internal bus cycle starts, which is
processed synchronously with the fastest CODESYS task. This ensures that
when starting each CODESYS Task, current input data are available from the
internal data bus and the output values of each CODESYS task are also output
to the I/O modules.
Figure 93: I/O Module Synchronization 02
CTI: CODESYS Task Interval
CT: CODESYS Task that accesses the I/O module of the internal data bus
KBZ: Internal Data Bus Cycle
Example:
CODESYS task interval (CTI): 2500 µs
Internal data bus cycle (KBZ): 2000 µs
Result:
Execution of the internal data bus cycle every 2500 µs.
