Honeywell HC900 Reference Manual page 259

4OR Function Block
Description
The 4OR label stands for the inclusive OR (4 Inputs) Boolean logic function .
This block is part of the Logic and Fast Logic categories.
Function
Turns digital output (OUT) OFF when inputs X1 through X4 are OFF . Thus,
If input X1 o r X2 or X3 or X4 is ON , then: OUT = ON .
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If all inputs are OFF, then: OUT = OFF .
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Input
X1 = First digital signal
X2 = Second digital signal
X3 = Third digital signal
X4 = Fourth digital signal
Output
OUT = Digital signal controlled by status of input signals
Block properties
Double click on the function block to access the function block properties dialog box.
Revision 11
2/07
HC900 Hybrid Control Designer Function Block Reference Guide
Function Blocks
4OR Function Block
245