Rockwell Automation 1771-IE,D17716.5.7 ANAL.INPUT MOD. - Manual (Page 8)

Overview of the Analog Input Module
Chapter 2
2Ć4
each input scan for formatting data, and cannot accept block transfers
during this time.
Figure 2.3
Input Conversion and Formatting
0001 0010 1001
(1) (2) (9)
Converted to
a BCD value
17 16 - 14 13 - 0
Over/
Under
flow
Channel
number
Analog
value
(BCD)
(129)
Stored in memory
129
Measurement of analog
voltage or current value
1 0 0 0 0 0 0 1
(129)
Converted to a
binary value
Status added by the module
14159
Input data is transferred to the processor in 12-bit 3-digit BCD format
with a range of 0-255.
The processor stores the data in 16-bit input words (Figure 2.4). The 16
bits are used as follows:
Input Data Format