Siemens SITRANS FEC920, Руководство пользователя

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FEC920: USER GUIDE
Page 105 September 18
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
†
Input2)
†
Input3)
†
Input4).
Figure 93 Eight input logic block configuration
6.13.1 Parameters
Operation AND, OR or XOR
Number of inputs The number of inputs to the logic operator
Invert Allows the user to invert individual inputs, as described below.
Invert Output ‘Yes’ inverts the output status
Input 1 The status of input 1, ignoring the Invert status. Cross = off; Tick = on.
Inputs 2 to N As for input 1, where N = the value of the ‘Number of Inputs’ parameter.
Output On or Off. Includes the effect of ‘Invert Output’ status.
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
Figure 94 Logic (8 input) block schematic
OR
2
0
Off
Operation
Number of Inputs
Invert
Invert Output
Input 1
Input 2
Output
Logic (8 input).1
The number of invert ‘boxes’
matches the ‘Number of inputs’
value (2 in this example)
Invert 1
Invert 2
Invert 4
Invert 8
Invert 16
Invert 32
Invert 64
Invert 128
Input 1
Input 2
Input 3
Input 4
Input 5
Input 6
Input 7
Input 8
OutInvert
Output
A5E45696052A Rev-AA