Table 16 Analog Alarm Configuration Parameters - Honeywell HC900 Reference Manual

ATTENTION
Local Setpoint is set in the Hybrid Control Designer unless "Use RSP Input" is enabled. Use
an Analog Variable connected to one RSP input (use RSP Input Enabled) if you want to
change alarm setpoint at the operator interface via the Variable Edit Display.
Parameter Index
#
N/A
Block Order
N/A
Alarm
Setpoint
Type
4
Hysteresis
0
Local
Setpoint
1
Use RSP Input
3
Output Latch
6
On Delay
Examples
F igure 10/Example 1 shows an ALM function block being used for Band Deviation Alarm—a control loop
H
process variable is compared to the loops working setpoint. A variable is used as the setpoint value to allow
Revision 11
2/07

Table 16 Analog alarm configuration parameters

Parameter Description
Execution Order for Block
Alarm Action Type
Hysteresis in engineering units can
be set from 0 to the input span
monitored variable.
Local Setpoint value in engineering
units or a calculation from another
function block via RSP (see "Use
RSP Input").
Remote Setpoint selection
ON latches the alarm output until
acknowledged.
To acknowledge an alarm, it must
be tagged and entered into an
alarm group. This will provide for
the acknowledgment from the
operator interface.
Number of seconds the alarm is
active before activating OUT.
HC900 Hybrid Control Designer Function Block Reference Guide
ALM Alarm Function Block
Value or Selection
Read Only. To change block order,
right-click on a Function Block and
select Execution Order.
PV>SP = High Process Variable/Local
Setpoint
PV>CV = High Process Variable
/Compare Value
PV<SP = Low Process Variable/Local
Setpoint
PV<CV = Low Process Variable
/Compare Value
(PV-CV)>SP = High Deviation Alarm
(CV-PV)>SP= Low Deviation Alarm
IPV-CVI>SP = Band Absolute
Deviation Alarm
0 to 99999.9 in Engineering Units
0 to 99999.9 in Engineering Units
Click on box to use Remote Setpoint
(RSP).
Click on Box to select.
0 to 240 seconds
Function Blocks
51