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Contact Logic |
  
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Contact Logic |
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AND LOGIC – Contact in Series
Figure 1: Contacts in Series
The figure above performs an AND Logic between the two last elements charged on the STACK, lowers a level of the STACK, and places the result on top of the STACK. That means that the following Boolean operation is performed: top of the STACK = BIT1.BIT2.
In IL (Instruction List) language it becomes like this:
LD BIT1 (* loads the value of variable BIT1 to the STACK *)
LD BIT2 (* loads the value of variable BIT2 to the STACK *)
AND (* Performs AND Logic between BIT1 and BIT2 through the STACK *)
Truth Table
BIT1 |
BIT2 |
STACK |
0 |
0 |
0 |
0 |
1 |
0 |
1 |
0 |
0 |
1 |
1 |
1 |
OR LOGIC – Contact in Parallel
Figure 2: Contacts in Parallel
The figure above performs an OR Logic between the two last elements charged on the STACK, lowers a level of the STACK, and places the result on top of the STACK. That means that the following Boolean operation is performed: top of the STACK = BIT1 + BIT2.
In IL (Instruction List) language it becomes like this:
LD BIT1 (* loads the value of variable BIT1 to the STACK *)
LD BIT2 (* loads the value of variable BIT2 to the STACK *)
OR (* Performs OR logic between BIT1 and BIT2 through the STACK *)
Truth Table
BIT1 |
BIT2 |
STACK |
0 |
0 |
0 |
0 |
1 |
1 |
1 |
0 |
1 |
1 |
1 |
1 |