Rockwell-automation 1771-IFE , D17716.5.90 USER MNL. ANALOG INPUT Modu Manual de usuario descargar pdf (Pagina 31)

Module Configuration

Chapter 4

4-2

You can configure the module to operate with any of five voltage or three

current ranges. You can select individual channel ranges using the

designated words of the write block transfer instruction (Table 4.A). Use

BTW word 1 for range selection of channels 1 through 8, and BTW word 2

for channels 9 through 16. Two bits are allocated for each channel. For

example, for channel 1, set word 1 bits 00-01 as shown in Table 4.A.

Table 4.A

Input

Range Selection Bits

Bit 01 Bit 00 Voltage or current input

0 0 1 to 5 V DC, 4 to 20 mA

0 1 0 to 5 V DC, 0 to 20 mA

1 0 5 to +5 V DC, 20 to +20 mA

1,2

1 1 10 to +10 V DC

, 0 to 10 V DC

Current input mode selected by configuration plug.

Configurable

using bipolar scaling.

Table 4.B shows the incremented voltage or current assigned to each bit for

the seven different input ranges. For example, if the channel 1 input range

is 0 to +5V and the actual incoming signal is at mid-range (+2.5V) the

value in the module’s data word would be 0000 1000 0000 0000 (binary)

or 2048 (decimal). The input is 2048/4096, or 1/2 of full scale.

Table 4.B

Input

oltage and Current Ranges for the Analog Input Module

Nominal Voltage or

Current Range

Corresponding 4Digit

BCD Output Range

Corresponding 12Bit

Binary Output Range

Voltage or

Current Per Bit

+1 to +5V 0000 to +4095 0000 to + 4095 0.98mV

0 to 5V 0000 to +4095 0000 to +4095 1.22 mV

5 to +5V 4095 to +4095 4095 to +4095 1.22mV

10 to +10V 4095 to +4095 4095 to +4095 2.44mV

0 to +20mA 0000 to +4095 0000 to +4095 .0049mA

+4 to +20mA 0000 to +4095 0000 to +4095 .0039mA

20 to +20mA 4095 to +4095 4095 to +4095 .0049 mA

Note: Voltage

and current input ranges are selectable on a per channel basis.

Input Range Selection

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 62 63

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Rockwell-automation 1771-IFE , D17716.5.90 USER MNL. ANALOG INPUT Modu Manual de usuario Pagina 31

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