DOC-0017-07-EN: AC20 Series - EtherCAT Option
46 (58) DOC-0017-07-EN-B 04.04.2023
10 Lost Communication Trip
Supervised Parameter:
The 0777 Comms Supervised parameter indicates that the EtherCAT network participation is supervised
by another EtherCAT device.
The Supervised parameter value is set to TRUE when either:
The heartbeat consumer and Heartbeat producer is enabled and error free.
Node guarding is enabled and error free.
Note that the watchdog will not be available if the Read Process data size is zero, in which case the
Supervised parameter will be FALSE.
Comms Break Trip
The drive will trip when there is a loss of communications between the master and the drive.
A COMMS BREAK trip will occur if the 0777 Comms Supervised parameter transitions from TRUE to
FALSE and the drive is in the operational state.
The trip may be disabled by clearing the respective bit in the parameter 0870 Enable Trips Lo. The
parameter Enable Trip Lo is a 32-bit word, the bit number 27 is used to disable or to enable the trip.
Comms state
The parameter 0774 Comms State indicates ‘PROCESS_ACTIVE’ when the EtherCAT communication is
active. The table below describes how the comms state relates to the EtherCAT network:
INIT, BOOTSTRAP or PRE-Operational
Operational: the network process data channel is active
(Error Ind’-bit in ‘AL-Status’ is set)
EtherCAT interface is forced to INIT state, and the master is informed that a power
cycle is required to resume communication
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