50
4 Set-up
Enter the F address of the F-PLC under F_Source_Add.
Under F_Dest_Add enter the F address of the SFB-PN
set at the 3 rotary coding switches.
INFORMATION
If the F_Dest_Add is not identical to the F address set in the SFB-PN,
a System Failure SF is generated.
Enter the required F monitoring time under F_WD_Time.
The F_WD_Time parameter defines the monitoring time for the PROFIsafe
communication between the F control system and the SFB-PN.
The module returns to the safe state if no valid F telegram is received within the
F_WD_Time. This ensures that communication problems or failures transfer the
F-PLC or the F device to a safe state.
INFORMATION
Set the F_WD_Time to a value, which allows toleration of communication delays.
In the event of erros, however, the response time should not be too high.
The minimum F watch dog time F_WD_Time, can be calculated as follows:
Acknowledgement time SFB-PN (DAT):
≤
25 ms
Cycle time F runtime group F-PLC (HAT):
+ ___ ms
Double cycle time PROFINET (BUS):
+ ___ ms
Minimum F_WD_Time:
= ___ ms
Definitions of terms from the DIN EN IEC 61784-3-3
DAT
Maximum acknowledgement time of the F module
(Device Acknowledgement Time)
HAT
Configured cycle time of F runtime group (Host Acknowledgement Time)
BUS
Configured PROFINET Bus cycle time multiplied by factor 2
INFORMATION
The module only starts correctly if the polling cycle of the PLC safety program
is significantly shorter than the F_WD_Time.
(e.g. polling cycle 20 ms, F_WD_Time
≥
80 ms)
