Alstom MiCOM P546 - Page 937

Symbols and Glossary P54x/EN SG/La4
MiCOM P543, P544, P545 & P546 (SG) 14-9
Logic gates
Symbol Truth Table Symbol Truth Table Symbol Truth Table
&
A
B
Y
&
A
B
Y
&
A
B
Y
IN
111
100
010
010
010
OUT IN
110
100
011
000
ABY
OUT IN
110
101
011
001
ABY
OUT
AND GATE
Symbol Truth Table Symbol Truth Table Symbol Truth Table
2
A
B
Y
2
A
B
Y
2
A
B
Y
IN
111
100
010
000
ABY
OUT IN
110
100
011
000
ABY
OUT IN
110
101
011
001
ABY
OUT
MULTI INPUT GATE
Symbol Truth Table
NOT GATE
AY
Inverter (NOT)
IN
10
01
AY
OUT
Symbol Truth Table Symbol Truth Table Symbol Truth Table
IN
110
101
011
000
ABY
OUT IN
111
100
010
001
ABY
OUT IN
111
100
010
001
ABY
OUT
EXCLUSIVE OR GATE
XOR
A
B
Y
XOR
A
B
Y
XOR
A
B
Y
Symbol Truth Table Symbol Truth Table Symbol Truth Table
1
A
B
Y
1
A
B
Y
1
A
B
Y
IN
111
101
011
000
ABY
OUT IN
111
100
011
001
ABY
OUT IN
110
100
010
001
ABY
OUT
OR GATE
Y
A
B
Q
S
R
Symbol Truth Table Symbol Truth Table Symbol Truth Table
R - S FLIP-FLOP
QN
0
AB QN+
Active
Mode
0
Hold
Mode
Hold
Mode
0
Reset
10
01
Set
10
Hold
Mode
1
01
Inhibit
Mode
00--
Y
A
B
Q
S
R
Y
A
B
Q
S
RD
* RD = Reset
Dominant
QNAB QN+
Active
Mode
Hold
Mode
0
Reset
00
01
Hold
Mode
10
Inhibit
Mode
01--
Set
10
Hold
Mode
10
1
QNAB QN+
Active
Mode
Hold
Mode
0
00
10
Set
10
Hold
Mode
01
1
011
SG