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8.4 Programming

KV-300 Series Only

KV-300

KV-10/80

Chapter 8 KV-AN6 Analog I/O Module

1-321

Full scale and resolution of each range

(12-bit BIN data)

Negative input data is treated as a 2’s complement.

• Maximum value (+10 V, +5 V, 20 mA)

• Minimum value (-10 V, -5 V, 0 mA)

(4 mA)

8.4.2 Calculating Input Data (A/D)

The KV-AN6 converts analog input signals to 16-bit digital values and writes them

into data memory. (The effective bits are the 12 bits starting from the most signifi-

cant digit.)

This section describes how to convert the data stored in data memory into digital

data (in decimal) according to the input range.

• Full scale and resolution of each range

The following table shows the full scale and resolution of each range.

• Since the effective bits that are written into data memory are the 12 bits starting

from the most significant digit, resolution is 1/4000 of the full-scale value.

To calculate the input voltage value or input current value from the data written

into data memory, use the following expressions:

Input voltage = DM value/16 x Resolution of the input range

Input current = (32000 + DM value)/16 x Resolution of the input range

To convert a 16-bit DM value to an effective 12-bit value, divide the 16-bit value

by 16.

Example 1

When 19200 (in decimal) is written into DM addresses in the ±10 V range

19200/16 x 5 mV = 6000 mV = 6 V

The KV-AN6 receives input of +6 V.

Example 2

When 12800 (in decimal) is written into DM addresses in the ±5 V range

12800/16 x 2.5 mV = 2000 mV = 2 V

The KV-AN6 receives input of 2 V.

Example 3

When 16000 (in decimal) is stored in DM addresses in the 0-to-20 mA range

(32000 + 16000)/16 x 5 µA = 15000 µA = 15 mA

The KV-AN6 receives input of +15 mA.

D15 D14 D13 D12 D11 D10 D09 D08 D07 D06 D05 D04 D03 D02 D01 D00

0000

Sign bit

0: Positive

1: Negative

Hexadecimal

Undefined

Data memory

addresses

Undefined

D15 D14 D13 D12 D11 D10 D09 D08 D07 D06 D05 D04 D03 D02 D01 D00

011111010000XXXX

7D0

Undefined

D15 D14 D13 D12 D11 D10 D09 D08 D07 D06 D05 D04 D03 D02 D01 D00

100000110000XXXX

830

Range Full scale Resolution

±10 V 20 V 5 mV

±5 V 10 V 2.5 mV

0 to 20 mA 20 mA 5 µA

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