Wcstate - Beckhoff CX B110 Series Manual

6.4

WcState

The variables under WcState (working counter state) use a working counter to indicate whether the
EtherCAT slave takes part in the cyclic process data traffic successfully and error-free.
The variable WcState of an EtherCAT slaves should therefore always be evaluated.
The variables are only displayed, if the EtherCAT slave is added via an EtherCAT master in TwinCAT.
The following table shows which values the WcState variable can assume:
Value Description
0 Valid real-time communication in the last cycle
1 Invalid real-time communication
Invalid real-time communication may affect the process data of the other EtherCAT slaves in the same
SyncUnit:
• In the event of an invalid WcState, outputs can still be switched by the PLC, in order to ensure a safe
state of the system.
• Inputs freezes and show the last valid value. This means that old values are displayed, if the WcState
assumed the value 1.
The variable InputToggle indicates whether a new valid telegram was received. The value is incremented by
one after each successful cycle.
CXxxxx-B110 Version: 1.3
Error handling and diagnostics
53