Preface
MicroLogix 1000 Programmable Controllers User Manual
5–2
I/O Image
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 they 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.
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