A device for controlling and monitoring a yarn processing system, which comprises
an electronic main control unit and at least one yarn feeding unit, and inside
of which a serial communications field bus system is provided with at least one
field bus for carrying out communication. At least one bi-directional event line
is provided outside the field bus system in order to transmit a time critical and/or
time-specific, digital and anonymous event signal for carrying out and/or confirming
events. For at least one communication participant connected to the field bus system,
an event specific characteristic feature of respective event signal can be defined
by the software side configuration inside the field bus system.