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Function Blocks

3/99 Function Block Reference Guide 129

2.46 2OR Function Block,

continued

Example

Figure 2-43 shows a Function Block Diagram using a 2OR function block.

LS 1

LS 2

SOL 1

Coil

This is a basic series-parallel circuit. If Limit Switch 1

(LS1) is ON and Limit Switch 2 (LS2) is ON, or

if pushbutton PB1 is ON, then Solenoid 1 is turned ON,

otherwise it is OFF. Note “power flow” can be delivered

in either of two paths to the solenoid.

PB1

Equivalent Boolean Logic Expression

UMC 800 Logic

A = LS1, B = LS2

D = Output

(A * B) + C = D

AND

Symbol

C = PB1,

Symbol

DOR

This uses a basic 2 Input AND block

and a 2 Input OR block.

6 Function blocks are used.

AND

Figure 2-43

2OR Function Block Example

Honeywell UMC800 Reference Guide

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