Specifications

sigmadue - IEC 61131-3 Function Block Library
6
1-3-3 ALARM_BAND MODULE
FB Prototype ALARM_BND
Input parameters
Output parameters
Description This function block generates only independent BAND inside or outside alarms.
Alarm description
Default values
Label Type Description
VALUE REAL Input value
REF REAL Reference value
SP_BND REAL Band Alarm
HY_BND REAL Hysteresis Band Alarm
Label Type Description
BND_O BOOL Band Out Alarm
BND_I BOOL Band In Alarm
VALUE
REF
SP_BND
HY_BND
REAL
REAL
REAL
REAL
¡
¡
¡
¡
BOOL
BOOL
BND_O
BND_I
¡
¡
Alarm Type Description
Band Out
The output BND_O is active if it is TRUE the conditions:
VALUE > (REF + SP_BND / 2 + HY_BND)
or
VALUE < (REF - SP_BND / 2 + HY_BND)
Band In
The output BND_I is active if it is TRUE the conditions:
VALUE > (REF - SP_BND / 2 - HY_BND)
and
VALUE < (REF + SP_BND / 2 - HY_BND)
Input Default value
VALUE 0.0
REF 0.0
SP_BND 0.0
HY_BND 1.0
Output Default value
BND_O FALSE
BND_I FALSE