Siemens 353 - Page 81

UM353-1B Function Blocks
April 2012
3-51
3.2.52 NOR_ - NOR Logic
NOR_ function blocks perform a logical NOR on the three
inputs. Any unused input will be set low (0).
3.2.53 NOT_ - NOT Logic
NOT_ function blocks perform a logical NOT on input
A. Any unused input will be set low (0).
BLOCK DIAGRAM
A
O1
B
C
NOR TRUTH TABLE
ABCO
utput
1
00 0
00
0
0
0
00
0
0
1
1
11
1
1
1
1
1
1
11
NOR
1
0
0
0
0
0
0
0
.
.
NOT
O1
O
utput
1
NOT
NOT_
ESN =
000
E
S
N
E
xec.
S
eq.
N
o.
(H)
................ 001 to 250
A
INPUT A
(H)
...........
loop tag.block tag.output (null)
ITU
Input
A
A
P
N
BLOCK DIAGRAM
O1
O
utput
1
A
Input
A
.
.
Input
A
NOR
O1
O
utput
1
NOR
NOR_
ESN =
000
A
ESN
E
xec.
S
eq.
N
o.
(H)
................ 001 to 250
C
TU
P
N
I
INPUT B
(H)
..........
loop tag.block tag.output (null)
Input
B
B
B
TU
P
N
I
INPUT C
(H)
..........
loop tag.block tag.output (null)
Input
C
C
A
TU
P
N
I
INPUT A
(H)
..........
loop tag.block tag.output (null)