Rockwell Automation PLC-5 Fieldbus Solutions for Integrated Architecture User Manual - Manual (Page 77)

Publication 1757-UM006A-EN-P - May 2002
Integrating Fieldbus into Rockwell Automation Logix System 2-33
Fieldbus Alarm Conditions
Fieldbus devices provide both process and device related alarms. The
fieldbus devices themselves own their alarm data; generates and clears
the alarms and events. The process alarms are associated with process
variable conditions and they are reported as process alarms into
ProcessLogix.
The device alarms are associated with actual device conditions or
processes within the block as indicated by BLOCK_ERR and
XD_ERROR bitstring alarms. These alarms are reported as device or
system alarms into the ProcessLogix notification system. Table 2.K
summarizes the possible fieldbus alarm enumerations and lists the
alarm/event type identification to be used in the alarm summary and
event summary displays in Station.
TIP
Fieldbus alarm functions do not support rate of
change (ROC) alarms. ROC alarms can only be
generated in applications that use ProcessLogix data
acquisition blocks for input signal conditioning.
Table 2.K Fieldbus alarm enumerations and alarm/event type identification
Enumeration Description Alarm/Event Type
UNDEF Undefended Alarm No Action
LO Low Limit Alarm PVLO
HI High Limit Alarm PVHI
LO LO Critical Low Limit Alarm PVLOLO
HI HI Critical High Limit Alarm PVHIHI
DV LO Deviation Low Alarm DEVLO
DV HI Deviation High Alarm DEVHI
DISC Standard Discrete Alarm OFFNORM
DISC Standard Discrete Alarm CHNGOFST
DISC DevCtl Fail Alarm FBDCFAIL
DISC DevCtl Accept Alarm FBDCACC
DISC DevCtl Ignore Alarm FBDCIGN
BLOCK BLOCK_ERR: 0 (Other (LSB) FFOTHER
BLOCK BLOCK_ERR: 1 (Block Configuration Error) FFBLKCFG
BLOCK BLOCK_ERR: 2 (Link Configuration Error) FFLNKCFG
BLOCK BLOCK_ERR: 3 (Simulate Active) FFSIMACT
BLOCK BLOCK_ERR: 4 (Local Override) FFLO