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Programming Function Blocks and Features
Video Recorder – User Manual 120
Order of evaluation
1. Parentheses ()
2. NOT
3. AND
4. OR, XOR
Example equation using operators and inputs
(A+B)*C computes the result of (A OR B) AND C.
Table 4-28 (A OR B) AND C
A B C Result
0 0 0 0
0 0 1 0
0 1 0 0
0 1 1 1
1 0 0 0
1 0 1 1
1 1 0 0
1 1 1 1
Example equation using iteration
The equation A+B*O computes the result of:
(Input A OR Input B from current machine cycle) AND (Input A OR Input B from previous machine cycle).
Table 4-29 shows some possible results of this equation.
Table 4-29 Results of Logic Equation Using Iteration
[Input A (current)
OR
Input B (current)]
AND
[Input A (previous)
OR
Input B (previous)] = Result
1 1 1 1 1
1 0 1 0 1
0 0 1 0 0
1 0 0 0 0
Inverter
The output CVn OS is the logical inverse of the input parameter.
Table 4-30 describes the Inverter prompts. See Table 4-2 for additional prompts.
Table 4-30 Inverter Prompts
Prompt Range/Selections Definition
INPUT OFF, discrete parameter, 0, 1 Input source to be inverted.