Honeywell HC900 - OR Function Block; Figure 124 XOR Function Block Example

Function Blocks
XOR Function Block
438 HC900 Hybrid Control Designer Function Block Reference Guide Revision 11
2/07
XOR Function Block
Description
The XOR label stands for the Exclusive OR Boolean operation.
This block is part of the
Logic and Fast Logic categories.
Function
Turns a digital output signal (OUT) ON if only one of two digital input signals (X, Y) is ON. Otherwise,
the output is OFF.
• If X = OFF and Y = ON, then: OUT = ON.
• If X = ON and Y = OFF, then: OUT = ON.
• If X = ON and Y = ON, or X = OFF and Y = OFF, then OUT = OFF.
Input
X
= First Digital Signal
Y = Second Digital Signal
Output
OUT
= resultant digital signal
Block properties
Double click on the function block to access the function block properties dialog box.
Example
HFigure 124 shows a Function Block Diagram using a XOR function block. In the example, if pressure input
1 or 2 is high or low, flow is disabled. If only one pressure input is ON, flow is enabled.
Figure 124 XOR function block example