Rockwell Automation 1771-IFE ANALOG INPUT MODULE User Manual
Page 39
4–7
Configuring Your Module
Publication 1771Ć6.5.115 - February 1999
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. Table 4.F shows the required BTW and
BTR file lengths.
Table 4.F
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
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.