Honeywell Experion PKS Series A, User Manual, Page: 235 / 560

5. Configuration
5.7. Block Offnet Diagnostic Alarm
R400 Experion PKS Series A Fieldbus Interface Module User's Guide 235
July 2010 Honeywell
the network, the Block Offnet Diagnostic Alarm is generated. If you set this parameter to
“False” when the Block Offnet Alarm is active, the alarm returns to normal. This
parameter can be configured before load and can be changed at runtime, even if the
device is offline.
ATTENTION
When you load the Fieldbus block, the value of the Enable Block Offnet
Diagnostic Alarm parameter is written to the Fieldbus Interface Module if;
the partial load option is selected or cleared.
the physical device is online or offnet.
It is not possible to load a CM containing a function block while the device
is offnet.
Behavior of the Block Offnet and Device Offnet System alarms in various
communication loss scenarios
The following table lists the behavior of the Block Offnet and Device Offnet System
alarms in the various communication loss scenarios.
Communication loss
scenario
Behavior of Block Offnet Alarm Behavior of Device Offnet System
Alarm
Loss of
communication
between C300 and
FIM
(This condition
occurs if both the
FTE cables are
disconnected.)
Block Offnet Alarm is not reported
for each loaded function block in
the device. Device Offnet System Alarm is not
reported for the device.
Loss of
communication
between an FF
device and FIM A high-priority Block Offnet Alarm
is reported for only those loaded
function blocks in the device,
which are configured to report the
Block Offnet Alarm. A high-priority Device Offnet
System Alarm is reported for the
device.
Communication
resumes between an
FF Device and FIM Previously reported Block Offnet
Alarms change from “Active” to
“Returned to Normal” in the Alarm The Device Offnet System Alarm
changes from “Active” to “Returned
to Normal” in the System Alarm