270 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)
8.9.2
Case 2: CODESYS Task Interval Smaller than Twice the
Local Bus Cycle
Execution of the local bus is synchronized with the set CODESYS task interval.
At the end of the CODESYS task, the local 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 local bus and the
output values of each CODESYS task are also output to the I/O modules.
Figure 87: Local Bus Synchronization (Case 2)
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): 2500 µs
Local bus cycle (LBZ): 2000 µs
Result:
Execution of the local bus cycle every 2500 µs.
