6
6-19GFK-0787B Chapter 6 Configuration
The voted analog references start at %AI0001. The size of the voted
analog input area is determined by the number of voted analog inputs
including spares.
Physical input data from analog block groups is located at the end of the
Analog Input Table, in the areas labelled A, B, and C in the preceding
illustration. Each of these areas is equal in length to the number of voted
inputs at the beginning of the table.
Unused portions of the Analog Input Table may be used for simplex
inputs.
Example
The following illustration shows an example Analog Input memory
configuration for a system with multiple GMR busses. There are a total
of 30 input groups having 6 inputs each, and 19 input groups having 4
inputs each. So the total number of voted inputs is:
( 6inputs X 30 groups) + ( 4 inputs X 19 groups)=256 voted inputs
The simplex inputs could then begin at %AI0257.
Voted Inputs
Simplex Inputs
A inputs
B inputs
C inputs
%AI0001
%AI0256
%AI0257
%AI7424
%AI7525
%AI7680
%AI7681
%I7936
%AI7937
%AI8192
Data from an analog block occupies either 4 or 6 input words,
depending upon the number of analog input channels on the block.
%R Size: In addition to any other specific %R memory required for the
application program, there must be %R memory available to the GMR
software for bus controller data and communications data.
To configure the correct amount of %R memory for the application, use
this worksheet:
_________ %R Initialization Data
+ _________ %M Initialization Data (number of 16-bit words)
+ _________ %R data needed for the application
+ _________ %R spare
+ 320 words Global Data
+ _________ (Number of GMR Bus Controllers in CPU x 66 registers)*
= _________ Total Words of Register Data
Configure the next higher 1K increment.
*For more information, please see chapter 7.
Exiting the Window
When you have completed this screen, select OK to return to the System screen. When
you select OK, your entries are saved and the window disappears. If you want to exit the
window and reset all fields to their previous content, select Close or Cancel instead.