BECKHOFF BK3xx0 - Manual (Page 72)

Notes on the Documentation
70 Fieldbus Components
Reaction to PROFIBUS Error
A PROFIBUS error (failure of the master, withdrawal of the PROFIBUS plug etc.) is detected after the DP watchdog
has elapsed (usually in the region of 100 ms, unless this has been deactivated in the master) or by bus timeout (the
baud rate supervision time is set to 10 s).
The reaction at the output data of the coupler can be set in the UserPrmData:
Byte Bit Value Description
00
bin
Reaction to PROFIBUS error: K-Bus cycle is abandoned (default, digital outputs become
0, complex outputs are set to a planned substitute value)
01
bin
Reaction to PROFIBUS error: K-Bus outputs become 0
10 0-
1
10
bin
Reaction to PROFIBUS error: K-Bus outputs remain unchanged