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Chapter 4
Processor and Module Considerations
Input Module's
Analog Input
A/D Converter
Sensors
Bit 15
Input 0
Input Channel 0
Input 1
Input Channel 1
4-2
Monitoring Analog I/O Data
You can monitor analog input and output data in binary or decimal format with
Advanced Programming Software (APS). You select the format by its radix.
The default radix is binary. Binary data is presented in 2's-complement format
(see appendix B). Changing the radix to decimal lets you view analog I/O
data as decimal representations of integer words.
If you are using the Hand–Held Terminal (HHT) or the Data Table Access
Module (DTAM ) to monitor analog I/O data, the binary radix is the only
available option. To view analog I/O data in decimal, you must program the
movement of data to an integer file and view it there.
Addressing I/O Image Words
Each module input channel is addressed as a single word in the processor's
input image table and each module output channel is addressed as a single
word in the processor's output image table. The module use a total of 2 input
words and 2 output words (Figure 4.1).
Figure 4.1
Processor I/O Image Words Used by the Module
Word Addresses
in I/O Image File
Output Image
Bit 0
Input Image
Input
Scan
The converted input values from input channels 0 and 1 are addressed as words
0 and 1 of the slot where the module resides. The output values for the output
channels 0 and 1 are addressed as output words 0 and 1 of the slot where the
module resides.
Example – You would address the output image word for output O, word 0, in
slot 3 as: O:3.0 where delimiters : and . must be placed as shown.
Capital Letter
I = Input, or
O = Output
O:e.0
Output
O:e.1
Scan
I:e.0
I:e.1
e = module's slot number in I/O rack
module's I/O rack slot location
I/O image table word
O:e.0-4
delimiters
Analog Output
Devices
Bit 15
Bit 0
Output Channel 0
Output 0
Output Channel 1
Output 1
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