Honeywell HC900 - Page 64

Function Blocks
ALM Alarm Function Block
50 HC900 Hybrid Control Designer Function Block Reference Guide Revision 11
2/07
[(PV-CV)>SP] High Deviation Alarm
• OUT = ON If the PV input minus the CV input is greater than the Local Setpoint
• OUT = OFF If the PV input minus the CV input is less than the Local Setpoint minus Hysteresis
[(CV-PV)>SP] Low Deviation Alarm
• OUT = ON If the CV input minus the PV input is greater than the local Setpoint
• OUT = OFF If the CV input minus the PV input is less than the Local Setpoint minus Hysteresis
⏐PV-CV⏐>SP Band Deviation Alarm
• OUT = ON If the absolute value of (PV–CV) is greater than the Local Setpoint
• OUT = OFF If the absolute value of (PV–CV) is less than the Local Setpoint minus Hysteresis
Inputs
PV = Process Variable
CV = Compare Value
RSP = Remote Setpoint
DISABLE = On disables alarm action.
Output
OUT = Output
Block properties