Figure 2-43 2Or Function Block Example - Honeywell UMC800 Reference Manual

2.46 2OR Function Block,
Example
Figure 2-43 shows a Function Block Diagram using a 2OR function block.
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.
Equivalent Boolean Logic Expression
A = LS1, B = LS2
D = Output
C = PB1,
UMC 800 Logic
This uses a basic 2 Input AND block
and a 2 Input OR block.
6 Function blocks are used.
3/99
continued
A
AND
B
C

Figure 2-43 2OR Function Block Example

Function Block Reference Guide
LS 1
PB1
AND Symbol
OR D
(A * B) + C = D
Function Blocks
LS 2
SOL 1
Coil
OR Symbol
129