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4.20 LOGIC (8 INPUT) BLOCK
Part of the ‘Toolkit Blocks’ option, this block allows AND, OR and cascading* XOR logic operations to be carried out on up to eight inputs.
*Cascading XOR example for inputs 1 to 4: (((Input1 ⊕ Input2) ⊕ Input3) ⊕ Input4).
Logic (8 input).1
Operation OR
Number of Inputs 2
Invert
Invert Output 0
The number of invert ‘boxes’
matches the ‘Number of inputs’
value (2 in this example)
Input 1
Input 2
Output Off
Figure 4.20 Eight input logic block configuration
4.20.1 Parameters
Operation
Number of inputs
Invert
Invert Output
Input 1
Inputs 2 to N
Output
AND, OR or XOR
The number of inputs to the logic operator
Allows the user to invert individual inputs, as described below.
‘Yes’ inverts the output status
The status of input 1, ignoring the Invert status. Cross = off; Tick = on.
As for input 1, where N = the value of the ‘Number of Inputs’ parameter.
On or Off. Includes the effect of ‘Invert Output’ status.
INPUT INVERSION
1.
2.
3.
4.
Use the down arrow key to highlight the ‘Invert’ field and operate the scroll key to enter edit mode
Use the up arrow key to highlight the first input to be inverted (the relevant input numbers appear in
the display boxes for uninverted inputs when highlighted).
Once the required input box is highlighted, use the scroll key to change the numeric character to a tick
symbol (to invert) or change the tick character to a numeric character (to remove a previous inversion).
Repeat for any further inputs, then operate the page key to confirm the changes and to quit edit mode.
4.20.2 Schematic
Input 1
Invert 1
Input 2
Invert 2
Input 3
Invert 4
Input 4
Invert 8
Input 5
Invert 16
Output
OutInvert
Input 6
Invert 32
Input 7
Invert 64
Input 8
Invert 128
Figure 4.20.2 Logic (8 input) block schematic
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HA030554
Issue 6 June 12