Beckhoff CX2100-0004 Manual page 39

Error handling and diagnostics
k_bus_request := TRUE; (* Rücksetzen des Busses, wenn Fehler beseitigt, dann startet der
Klemmbus wieder *)
....
In order for the controller and the registers to co-operate, they must be linked in the System Manager.
CX2100-0004 Version: 1.2 39