Function Blocks
4ALM Function Block
Revision 11 HC900 Hybrid Control Designer Function Block Reference Guide 73
2/07
4ALM Function Block
Description
The 4ALM label stands for the 4 Alarm with Hysteresis.
This block is part of the
Alarm/Monitor Blocks category.
Function
This block monitors four analog input values (SP1, SP2, SP3, SP4) and performs up to four alarm
comparisons against the PV input. Configurable Alarm types are Disabled, Low, High. The associated
output pins, AL1 through AL4, will turn ON if the configured HIGH or LOW alarm condition is present.
The individual hysteresis settings for each alarm are used to prevent output cycling.
Inputs
PV
= Process variable
SP1 = Analog value
SP2 = Analog value
SP3 = Analog value
SP4 = Analog value
Outputs
AL1
= Alarm output
AL2 = Alarm output
AL3 = Alarm output
AL4 = Alarm output
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