Honeywell VRX180 Order of evaluation, Example equation using operators and inputs, a or B and C

Programming Function Blocks and Features

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)		Input B (current)]		[Input A (previous)	Input B (previous)]	= Result
OR		AND		OR
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.

120 Video Recorder – User Manual