Fig. 29 Twincat 2.9 - Mc Tab - Beckhoff FC3102 Documentation

FC310x as master
Clear-Mode: It is possible to specify here whether the master enters (or stays in) the "Clear" state as long as
either at least one MC slave (the "Only MC-Slaves" setting) or any slave (the "All Slaves" setting) does not
respond correctly (has a DpState [} 25] other than 0) (see the Error Reactions [} 16] chapter).
Windows watchdog: Here a watchdog can be activated, which, in case of a PC crash, will cause the
FC310x to enter the STOP state and terminate the data exchange with all configured slaves (see Error
Reactions [} 16]). The time is important in redundancy mode [} 38] of the primary master.
Set WD individually for each slave: Here you can select whether the WD should be set individually for
each slave (on the Profibus [} 58] tab of the box)
DP-Watchdog-Time: If the checkbox "Set WD individually for each slave" is not ticked, the DP watchdog
can be set here to a uniform value for all slaves.
Calculate DP-Slave Watchdog Time: This is used to set the DP watchdog time for all DP slaves to a
sensible value.
3.8.2.4 MC tab
Fig. 29: TwinCAT 2.9 - MC tab
Task-Access-Time (Shift-Time): This time must be greater than the maximum TwinCAT jitter plus the
maximum mapping time (see chapter PROFIBUS MC [} 25])
Task access time/task cycle time: This ratio makes sense if you want to avoid manually adjusting the task
access time when using the Calculate MC-Times button.
PLL-Sync-Time: Only relevant for Sync-Mode Disabled, sets the PLL window on the FC310x
Task Cycle Time: Displays the cycle time of the corresponding highest priority task
Estimated DP-Cycle Time: Displays the expected PROFIBUS cycle time.
Estimated Mapping Time: Indicates the expected mapping time.
Set To on Box: The To-time can be set individually for each slave on the Prm data (text) [} 62] tab of the
box
Set Ti on Box: The Ti-time can be set individually for each slave on the Prm data (text) [} 62] tab of the box
52 Version: 3.0 FC3101 and FC3102