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1.2
Analog Input Operation
Signal Translation
Analog Signal for
PPX:505–6108A
1-4
Product Overview
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The Analog Input module operates asynchronously with the controller. That
is, the controller and module do not update at the same time. Instead, the
module translates all analog inputs in one module update and stores the
translated words in buffer memory. When the controller I/O scan starts, it
retrieves the words from the buffer memory of the module.
The PPX:505–6108A analog signal is translated into a 12-bit digital word.
Since the controller requires a 16-bit word for inputs, the 12-bit value from
the converter is placed into a 16-bit word for transmittal to the controller.
As shown in Figure 1-2, of the four bits not used for the converter
magnitude, one is used to show the sign of the value, one is used to note
overrange values, and the remaining two are not used and are set to zero.
MSB
1
2
3
4
Digital word converted from analog input
Sign bit
1 = negative
0 = positive
Figure 1-2 Output from the PPX:505–6108A Module to the Controller
5
6
7
8
9
10 11 12 13 14 15 16
Not used
Set to zero
Series 505 Analog I/O Modules User Manual
LSB
Overrange
if set to 1.
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