Lmon Function Block - Honeywell UMC800 Reference Manual

Function Blocks

2.30 LMON Function Block

Description
The LMON label stands for Low Monitor. This block is part of the Alarm/Monitor category. It looks like
this graphically on the Control Builder.
Function
Monitors two analog input values (X and Y), and turns ON a digital output if X is less than Y.
A hysteresis adjustment is provided to prevent output cycling.
•
If X < Y, then: OUT = ON.
• If X > or = (Y + Hysteresis), then: OUT = OFF.
• If (Y + Hysteresis) > X > Y, then: OUT = Previous State.
Input
X = Analog value.
Y = Analog value
Output
OUT = Digital signal
Block Properties
Double click on the function block to access the
function block properties dialog box.
Block Order (Read Only)
You can change the assigned execution order
number by selecting "Execution Order" in the
"Configure" menu and arrange the order to suit
your control strategy.
Configuration Parameters
You must configure the LMON function Block
parameters to the desired value or selection that
matches your operating requirements.
Table 2-28
describes the parameters and the
value or selection.
88 Function Block Reference Guide 3/99