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Logic (8 Input) Block; Parameters; Schematic - Siemens FEC920 User Manual

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6.13

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
Number of Inputs

6.13.1 Parameters

Operation
Number of inputs
Invert
Invert Output
Input 1
Inputs 2 to N
Output
INPUT INVERSION
1.
Use the down arrow key to highlight the 'Invert' field and operate the scroll key to enter edit mode.
2.
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).
3.
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).
4.
Repeat for any further inputs, then operate the page key to confirm the changes and to quit edit mode.

6.13.2 Schematic

September 18
FEC920: USER GUIDE
Logic (8 input).1
Operation
OR
2
Invert
Invert Output
0
Input 1
Input 2
Output
Off
Figure 93 Eight input logic block configuration
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 1
Invert 1
Input 2
Invert 2
Input 3
Invert 4
Input 4
Invert 8
Input 5
Invert 16
Input 6
Invert 32
Input 7
Invert 64
Input 8
Invert 128
Figure 94 Logic (8 input) block schematic
A5E45696052A Rev-AA
Input2)
Input3)
Input4).
The number of invert 'boxes'
matches the 'Number of inputs'
value (2 in this example)
OutInvert
Output
Page 105

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