Rockwell-automation 1771-IFF/A INSTL.INSTR FAST ANALOG INPUT Manual de usuario descargar pdf (Pagina 14)

Publication 1771-IN046B-EN-P - December 2003

14 Fast Analog Input Module

Configure the Module

You must configure the module to conform to the analog device and specific

application that you have chosen. Use the configuration information below to

configure your module to your specifications.

Dec. Bits 15 14 13

08 07 06 05 04 03 02 01 00

Octal Bits 17 16 15

11 10 07 06 05 04 03 02 01 00

Word 1 8 7 6 5 4 3 2 1 Range Selection - Channels 1 - 8

2 16 15 14 13 12 11 10 9

Range Selection - Channels 9-16

Input range selections allow the

Bit 01 Bit 00 Voltage or Current Input

user to configure the inputs for

any of 7 input voltage or current

0 0 1 to 5V dc, 4 to 20mA (default)

any

input

voltage

current

ranges. Two bits are required for

1 0 to 5V dc, 0 to 20mA

channel 1, bits 02 and 03 for

0 -5 to +5V dc, -20 to +20mA

channel 2, etc.

1 -10 to +10V dc, 0 to 10V dc

3 Real Time Sampling

Data

Format

Input

Type

Digital Filter

Real time sampling, data format,

input type and digital filter

Digital filter reduces ef fect of noise on input. (Default is no filter.)

Input type, set bit for differential mode on all channels.

Reset (0) = single-ended inputs (default)

Set (1) = differential inputs

Real time sampling - Default is no RTS

Data format - set to

match your processor .

2' s Complement, data first

Two' s complement binary

Signed magnitude binary

Minimum sign bits , when set, designate negative minimum scaling values for the

corresponding input channels. Bit 00 corresponds to channel 1, bit 01 corresponds to

channel 2, etc.

Sign Bits, minimum scaling

values

Maximum sign bits, when set, designate maximum scaling values that are negative.

Maximum scaling value must be greater than minimum on any particular channel. Bit 00

corresponds to channel 1, bit 01 corresponds to channel 2, etc.

Sign Bits, maximum scaling

values

6, 8, 10, 12,

14, 16, 18,

20, 22, 24,

26, 28, 30,

32, 34, 36

Minimum scaling values for each channel. Enter in BCD format. Channel 1 - minimum scaling

7, 9, 1 1, 13,

15, 17, 19,

21, 23, 25,

27, 29, 31,

33, 35, 37

Maximum scaling values for each channel. Enter in BCD format. Channel 1 - maximum scaling

Offset calibration - Each bit represents a channel (bit 00 to channel 1, bit 02 to channel 2,

etc.). When the bit is set, and a BTW has been sent, the module will read the channels and

adjust the offset to analog ground potential. In differential mode, bits 08 thru 15 (10 thru 17

in octal) are ignored. In current mode, apply 0mA.

Of fset Calibration

Gain calibration - Each bit represents a channel (bit 00 to channel 1, bit 02 to channel 2, etc).

When the bit is set, and a BTW has been sent, the module will read the channels and adjust

the gain correction values. If used on +, 0 to 5, or 1 to 5V ranges, a value of 5V is expected.

If used on +10V range, 10V is expected. In dif ferential mode, bits 08 thru 15 (10 thru 17 in

octal) are ignored. In current mode, apply 20mA.

Gain Calibration

14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Channel Sampling Disable

41 BCD or binary , 0-256 (2

only), 0 = default (8X oversample) Oversampling

Bit 10 Bit 09

(12)

(11)

BCD (default)

for each channel. Bits 00 and 01 for

Description

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 20

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