Rockwell Automation 1771-IFF/A,D17716.5.116 FAST ANALOG INPUT MODULE User Manual
Page 57
6-7
Publication 1771Ć6.5.116 - June 1996
Important: Scaling values must always be entered in BCD
format, even if the data format chosen is binary. If
scaling is selected for any channel, all channels must be
scaled. If scaling is not required on certain channels,
set those to the default input range: 0 to 4095 for 0 to +
voltage or current ranges, and -4095 to +4095 for - to +
voltage or current ranges.
If scaling is not selected, the module requires specific minimum
BTR file lengths for the number of channels used. The BTW file
length can be set to 3 words. The following table shows the required
BTW and BTR file lengths when using scaling.
Block Transfer Read and Write File Lengths
Channels Used
BTR File
Length
BTW File
Length
1
5
7
2
6
9
3
7
11
4
8
13
5
9
15
6
10
17
7
11
19
8
12
21
9
13
23
10
14
25
11
15
27
12
16
29
13
17
31
14
18
33
15
19
35
16
20
37
Calibration
21
38
Words
22
39
Oversampling
23
40
Sampling Disable
24
41
Important: Use decimally addressed bit locations for PLC-5
processors.
The module will return values outside the scaling range. For
example, if a module is in the 0–5V dc mode, scaled for 0 to 5000,
and has –2V dc applied, it will return –2000.