WAGO-I/O-SYSTEM 750
Run-time System CODESYS 2.3 259
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)
8.9.4
Case 4: CODESYS Task Interval Greater than 10 ms
Synchronization takes place as in case 3; however, the output modules would be
reset to their default state after 150 ms without an internal data bus cycle. This
reliably prevents the execution of an internal data bus cycle after at least every
10 ms.
The I/O data from the internal data bus are refreshed once before the CODESYS
task and once after the CODESYS task and an additional internal data bus cycle
is also executed every 10 ms.
Figure 95: Internal Data Bus Synchronization 04
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): 150000 µs
Internal data bus cycle (KBZ): 2000 µs
Result:
Execution of the internal data bus cycle 2000 µs prior to the CODESYS
task, once directly after the CODESYS task and 10 ms after the previous internal
data bus cycle.
