LIM

LIM is an alarm with hysteresis on a REAL value for high and low limits. 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.
A Process alarm is an alarm that occurs when a fault is received and processed by the controller. Process-level alarms provide an alert when the module has exceeded the configured high or low limits for each channel.
Languages supported: Function block diagram, ladder diagram, and structured text.
This instruction applies to the L20E, L50E, and L70E controllers.
LIM
LIM
LIM parameters
Parameter
Parameter Type
Data Type
Description
EN
Input
BOOL
When set to true, the instruction is enabled.
  • TRUE: Execute the current computation.
  • FALSE: There is no computation.
Applies to ladder diagram programs.
H
Input
REAL
High limit value.
X
Input
REAL
Input is 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 exceeds the high limit H.
Q
Output
BOOL
Alarm output: TRUE if X is outside of limits.
QL
Output
BOOL
Low alarm: TRUE if X is below the low limit L.
ENO
Output
BOOL
Enables output. Applies to ladder diagram programs.

LIM examples

LIM timing diagram example
LIM timing diagram example
LIM function block diagram example
LIM function block diagram example
LIM ladder diagram example
LIM ladder diagram example
LIM structured text example
LIM structured text example
Results
Results
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