And_ - And Logic - Siemens Moore 353 User Manual

Function Blocks
An alarm status word is shown below.
A_=1 when the alarm is active
N_=1 when the alarm is Not acknowledged
E_=1 when the alarm is enabled (when the alarm is disabled the E, N, and A bits are set to 0)
OS=1 indicates that all alarms are identified as Out of Service which means that all alarms function normally but the
OS flag indicates to a higher level device that they can be ignored. OS cannot be set locally.
CC=1 indicates a configuration change has occurred. It can be reset by a write command.
AE=1 indicates an Active Event is present within the loop. It will clear when all the loop events clear.
NA will be set to 1 when events occur and at least one within the loop has not yet been acknowledged. It can be
reset to 0 which will acknowledge all events within the loop or when 0 will indicate all active events have been
acknowledged
BIT 15 14 13 12
1 AE NA CC OS
0

3.2.13 AND_ - AND Logic

AND_ function blocks perform a logical AND on the three
inputs. Any unused input will be set high (1).
A
B
C
.
AND TRUTH TABLE
A B
0 0
0 0
0 1
0 1
1 0
1 0
1 1
1 1
BLOCK DIAGRAM
3-24
11 10 9 8
E4 N4 A4 E3
AND
O1
.
C Output 1
0 0
1 0
0 0
1 0
0 0
1 0
0 0
1 1
7 6 5 4 3
N3 A3 E2 N2 A2
AND
AND_ ESN = 000
Input A
A
AND
Input B B
C
Input C
I N P U T A
INPUT A
(H)
I N P U T B
INPUT B
(H)
N U T
I P C
INPUT C
(H)
E S N
Exec. Seq. No.
UM353-1
2 1 0
E1 N1 A1
O1
Output 1
..........
loop tag.block tag.output (null)
..........
loop tag.block tag.output (null)
..........
loop tag.block tag.output (null)
................ 001 to 250
(H)
March 2003