272 Run-time System CODESYS 2.3
WAGO I/O SYSTEM 750 XTR
750-8202/040-001 PFC200 2ETH RS TELE XTR
Manual
Version 1.2.0, valid from FW Version 03.01.07(13)
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 100 ms without a local bus cycle. This reliably
prevents the execution of a local bus cycle after at least every 10 ms.
The I/O data from the local bus are refreshed once before the CODESYS task
and once after the CODESYS task and an additional local bus cycle is also
executed every 10 ms.
Figure 89: Local Bus Synchronization (Case 4)
CTI:
CODESYS Task Interval
CT:
CODESYS task that accesses the I/O modules via the local bus
LBZ:
Local bus cycle
Example:
CODESYS task interval (CTI): 150000 µs
Local bus cycle (LBZ): 2000 µs
Result:
Execution of the local bus cycle 2000 µs prior to the CODESYS task,
once directly after the CODESYS task and 10 ms after the previous local bus
cycle.
