Honeywell HC900 Reference Guide

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

Honeywell HC900 Specifications

General

Series	HC900
Redundancy	Optional
Programming Language	Function Block Diagram, Ladder Logic, Structured Text
Inputs	Analog, Digital
Outputs	Analog, Digital, Relay
Display	Optional
Control	PID, Advanced Control
Power Supply	24V DC or 100-240V AC
Storage Temperature	-40°C to 85°C
Humidity	5% to 95% non-condensing
Communication Protocols	Modbus, Ethernet