Chapter 4 Alarm instruction
58 Rockwell Automation Publication 2080-RM001D-EN-E - February 2015
LIM_ALRM is an alarm with hysteresis on a Real value for high and low limits.
LIM_ALRM operation
A hysteresis is applied on high and low limits. The hysteresis delta used for either
high or low limit is one half of the EPS parameter.
Process alarms
An alarm occurs when a fault is received and processed by the controller. Process
level alarms alert you when the module has exceeded the configured high or
configured low limits for each channel.
Arguments
Parameter
Parameter
type
Data type Description
EN Input BOOL Function block enable.
When EN = TRUE, execute current LIM_ALRM computation.
When EN = FALSE, there is no computation.
Applies only to LD programs.
H Input REAL High limit value.
X Input REAL Input: any real value.
L Input REAL Low limit value.
EPS Input REAL Hysteresis value (must be greater than zero).
QH Output BOOL High alarm: TRUE if X above high limit H.
Q Output BOOL Alarm output: TRUE if X out of limits.
QL Output BOOL Low alarm: TRUE if X below low limit L.
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