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Preface, Converting analog output data – Rockwell Automation 1761 MicroLogix 1000 Programmable Controllers User Manual

Page 98

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Preface

MicroLogix 1000 Programmable Controllers User Manual

5–6

input value

=

input voltage(V)

10.5V

32,767

The Input Value is the decimal value of the word in the

input image for the corresponding analog input.

For example, if an input value of 16,021 is in the input image,
the calculated value is:

10.5V

32,767

16,201

=

5.1915(V)

It should be noted that the actual value may vary within the
accuracy limitations of the module.

To determine an approximate current that an input value represents, you can use the
following equation:

input value

=

input current (mA)

21 mA

32,767

The Input Value is the decimal value of the word in the

input image for the corresponding analog input.

For example, if an input value of 4096 is in the input image,
the calculated value is:

4096

=

2.625 (mA)

It should be noted that the actual value may vary within
the accuracy limitations of the module.

21 mA

32,767

Converting Analog Output Data

Use the following equation to determine the decimal value for the current output:

[Desired Current Output (mA) – 4 mA] = Output Decimal Value

For example, if an output value of 8 mA is desired, the value to be put in the
corresponding word in the output image can be calculated as follows:

(8 mA – 4 mA)

=

8192

32,767

16 mA

32,767

16 mA

U

se the following equation to determine the decimal value for the voltage output:

32,767

Desired Voltage Output (V dc) = Output Decimal Value

For example, if an output value of 1V dc is desired, the value to be put in the
corresponding word in the output image can be calculated as follows:

1V dc

=

3277

32,767
10V dc

10V dc