1MRK 511 434-UEN A
Section 2
SAM600 Process Bus I/O System
SAM600 Process Bus I/O System
33
Operation Manual
2.3.11
Watchdog functionality
A watchdog functionality is available on SAM600-TS. The watchdog is activated
in case of a device error on SAM600-TS or a severe error condition announced by
any module in the SAM600 system. Error conditions announced in the SAM600
system are listed in
Section 2.3.10
. The SAM600-TS module will operate the
watchdog if any one of these conditions is announced in the system or detected
locally. Once the error condition is cleared, the SAM600-TS module will
automatically reset the watchdog.
The watchdog error indication is not sticky. Once the error
condition is cleared the SAM600-TS module will reset the
watchdog automatically after ca. 20 seconds.
In case the SAM600 system bus is configured as HSR ring the behaviour of the
watchdog regarding SAM600 system bus link errors is configurable. The parameter
“
Open IRF contact on system bus single redundancy error
” controls whether the
watchdog is operated on a single link error or double link error. Default value of
the parameter is FALSE, which means the watchdog is not operated in case of a
single link failure in the SAM600 system bus. Due to the communication
redundancy of the HSR ring such a single link error has no impact on the system
functionality.
Nevertheless, the user can set the parameter value to TRUE, in which case a single
link failure in the SAM600 system bus will trigger the watchdog. Double link
failures, i.e. a module has no connection to the SAM600 system bus on either of its
two ports, will always trigger the watchdog.
The parameter “
Open IRF contact on system bus single redundancy error
” can be
configured in the Parameter Setting Tool of PCM600. The parameter is system-
wide, i.e. all SAM600-TS modules will operate their watchdog in the same way.
