Configure the module – Rockwell Automation 1771-IFF/A INSTL.INSTR FAST ANALOG INPUT User Manual
Page 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
1
2
11
1
0
0
9
08
07
06
05
04
03
02
01
00
Octal Bits
17
16
15
1
4
13
1
2
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
V oltage or Current Input
p
g
user to configure the inputs for
any of 7 input voltage or current
0
0
1 to 5V dc, 4 to 20mA (default)
any of 7 input voltage or current
ranges. Two bits are required for
0
1
0 to 5V dc, 0 to 20mA
channel 1, bits 02 and 03 for
1
0
-5 to +5V dc, -20 to +20mA
channel 2, etc.
1
1
-10 to +10V dc, 0 to 10V dc
3
Real Time Sampling
Data
Format
Input
T ype
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
T wo' s complement binary
Signed magnitude binary
4
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
5
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
38
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
39
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
40
15
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
X
only), 0 = default (8X oversample)
Oversampling
Bit 10 Bit 09
(12)
(11)
0
0
0
1
1
0
1
1
BCD (default)
for each channel. Bits 00 and 01 for
Description