Rockwell Automation 1771-IFF/A,D17716.5.116 FAST ANALOG INPUT MODULE - Manual (Page 53)

6-3
Publication 1771Ć6.5.116 - June 1996
Input Voltage and Current Ranges for the Fast Analog Input Module
Nominal Voltage or
Current Range
Corresponding 4ĆDigit BCD
Output Range
Corresponding 12ĆBit
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 1.22mV
Ć5 to +5V Ć4095 to +4095 Ć4095 to +4095 1.22mV
Ć10 to +10V Ć4095 to +4095 Ć4095 to +4095 2.44mV
0 to +20mA 0000 to +4095 0000 to +4095 .0049mA
+4 to +20mA 0000 to +4095 0000 to +4095 .0039mA
Ć20 to +20mA Ć4095 to +4095 Ć4095 to +4095 .0049mA
Note: Voltage and current input ranges are selectable on a per channel basis.
Select single-ended or differential inputs using the designated bit in
the configuration file. Inputs to a particular module must be all
single-ended or all differential. Set BTW word 3, bit 08 (bit 10 octal)
as shown below.
Selecting SingleĆended or Differential Inputs
Decimal Bit 8 (Octal Bit 10) Input type
1 differential inputs
0 singleĆended inputs
Dec. Bits 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Description
Octal Bits 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00
Description
Write Word 3 Real Time Sampling
Data
Format
Input
Type
Digital Filter
Real time sampling, data format, input
type and digital filter
You must indicate what format will be used to read data from your
module. Typically, you select BCD with PLC-2 processors, and 2’s
complement binary with PLC-3 and PLC-5 processors. See
Appendix C for details on data format. You use BTW word 3, bits
09-10 (11-12 octal) to set the data format.
Selecting the Data Format
Decimal Bit 10
(Octal Bit 12)
Decimal Bit 09
(Octal Bit 11)
Data Format
0 0 BCD
0 1 two's complement binary, data first
1 0 two's complement binary
1 1 signed magnitude binary
Chapter
Appendix C
Input Type
Data Format