Rockwell Automation 1761-HHP-B30 MicroLogix 1000 with Hand-Held Programmer (HHP) - Manual (Page 115)

7 Chapter
7–1
Using Analog
This chapter describes the operation of the MicroLogix 1000 analog
controllers. Topics include:
•
I/O Image
•
I/O Configuration
•
Input Filter and Update Times
•
Converting Analog Data
The input and output image files of the MicroLogix 1000 analog controllers
have the following format:
Address Input Image Output Image Address
I:0.0 Discrete Input Word 0 Discrete Output Word 0 O:0.0
I:0.1 Discrete Input Word 1 Reserved O:0.1
I:0.2 Reserved Reserved O:0.2
I:0.3 Reserved Reserved O:0.3
I:0.4 Analog Input 0 (Voltage)
Analog Output 0 (Voltage or
Current)
O:0.4
I:0.5 Analog Input 1 (Voltage)
I:0.6 Analog Input 2 (Current)
I:0.7 Analog Input 3 (Current)
Input words 0 and 1 contain discrete input data. Unused inputs in the
discrete inputs image space are reset during each input scan. Input words 2
and 3 are reserved and are not updated by the controller. These inputs have
no direct effect on controller operation, but can be modified like other data
bits.
Input words 4–7 contain the status of the four analog input channels
respectively. Analog input image words are cleared at Going To Run (GTR).
For enabled channels, the analog input image is updated on a cyclical basis.
Output word 0 contains discrete output data. Output words 1–3 are reserved
output image space. Unused outputs in both the discrete output image space
and the reserved output image space have no direct effect on controller
operation. But these outputs can be modified like other data bits. Output
word 4 holds the value of the analog output channel.
I/O Image