11.3 XOR operator
The XOR function is used when both sources must be either high
(1) or low (0) for the output signal to be low (0). If just one of the
sources is high (1), the output signal is high (1).
When the input signal to the two sources has different
status, the output signal is high.
See the figure below.
1st source
2nd source
Output signal
0
1
1
1
0
1
1
1
0
0
0
0
1
2
3
4
5
6
≤1
TM046715
Logical XOR function
Pos.
Description
1
1st source
2
2nd source
3
1st source
4
2nd source
5
Output signal
6
Output signal
11.4 Set/reset flip-flop
The "Set/reset flip-flop" function (SR-FF) is used when the 1st
source has to be used to set an alarm or just to change the output
signal to high (1). The output signal remains high (1) even if the 1st
source changes to status low (0).
The output signal can only be changed to status low (0) when the
2nd source changes status to high (1). The output signal remains
low (0) even if the 2nd source changes to status low (0).
If both 1st source and 2nd source have status high (1), the 1st
source (set signal) has the highest priority.
See the figure below.
1st source/set
2nd source/
reset
Action
Output signal
0
1
Reset
0
1
0
Set
1
1
1
Set
1
0
0
No change
Unchanged
signal
1
2
6
7
8
3
4
5
S
R
Q
TM046716
Logical Set/reset flip-flop function
Pos.
Description
1
1st source
2
2nd source
3
1st source
4
2nd source
5
Output signal
6
Output signal
7
Set
8
Reset
Related information
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