
Appendix B: Implementation Details
118 (136)
B
Implementation Details
B.1
SUP-bit Definition
The supervised bit (SUP) indicates that the network participation is supervised by another net-
work device. In the case of EtherCAT, this functionality is mapped to the SyncManager watch-
dog, which can be used to detect loss of communication with the master. The SyncManager
watchdog is enabled by the master.
EtherCAT-specific interpretation:
SUP-bit
Interpretation
0
SyncManager Watchdog is disabled or not running.
1
SyncManager Watchdog is enabled and running.
The watchdog and supervised bit (SUP) will not be available if the Read Process Data size is
zero.
B.2
Anybus State Machine
The table below describes how the Anybus State Machine relates to the EtherCAT network
status.
Anybus State
Corresponding EtherCAT State
WAIT_PROCESS
INIT, BOOTSTRAP or PRE-OPERATIONAL
ERROR
(‘Error Ind’-bit in ‘AL-Status’ is set)
PROCESS_ACTIVE
OPERATIONAL
IDLE
SAFE-OPERATIONAL
EXCEPTION
(EtherCAT interface is forced to INIT state, and the master is informed that a power
cycle is required to resume communication)
B.3
Application Watchdog Timeout Handling
The Anybus CompactCom 40 EtherCAT module will enter the EXCEPTION state if the applica-
tion watchdog times out.
Anybus
®
CompactCom
™
40 EtherCAT
®
Network Guide
SCM-1202-034 1.1
Содержание CompactCom 40 EtherCAT
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