Sub Function Block - Honeywell UMC800 Reference Manual

Function Blocks

2.66 SUB Function Block

Description
The SUB label stands for the Subtraction mathematical operation (2 Inputs). This block is part of the
Math category. It looks like this graphically on the Control Builder.
Function
Subtracts one input (X) from another (Y) to obtain an output.
• OUT = X–Y.
Input
X = First analog value
Y = Second analog value
Output
OUT = Calculated Value
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.
Example
Figure 2-70 shows a Function Block Diagram using a SUB function block.
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Figure 2-70 SUB Function Block Example
Function Block Reference Guide 3/99