Siemens 353 User Manual

Function Blocks UM353-1B
April 2012
3-88
PRIORITIES - The priority assigned to SL PRIOR will affect the operation as follows (the outputs HS and LS will
go high with all priority assignments, including 0, when event is active):
1. Bargraphs, event LEDs, and condition will flash. ACK button must be used to stop flashing.
2. Bargraphs, event LEDs, and condition will flash. Flashing will stop if ACK or if event clears.
3. Event LEDs and condition will flash. ACK button must be used to stop flashing.
4. Event LEDs and condition will flash. Flashing will stop if ACK or event clears.
5. Event LEDs and condition will turn on when event is active and off when the event clears.
0. No display action occurs when event is active. The HL and LL status bits are always set to 0.
3.2.85 SRF_ - SR Flip-Flop
SRF_ function blocks perform a set dominant flip-flop
function as detailed in the truth table. An unused R input
will be set high (1) and an unused S input will be set low
(0).
POWER UP - During a warm start, when PU LAST is set
to YES, the block will initialize at the input/output states
at the instant power down occurred. A cold start will
initialize the input/output states to 0.
3.2.86 SRT_ - Square Root
SRT_ function blocks compute the square root of input
signal A. The input has a built-in low limit that will limit
the signal to the square root computation to 0.0.
BLOCK DIAGRAM
S
O1
R
SR FLIP-FLOP TRUTH TABLE
SRLO O1
1
0
0
0
XX
X
1
1
10
000
0
1
S - SET
Input
R - RESET
Input O1 - O
utput
LO -
Last
O
utput
O
utput
1
S
et
R
eset
X (don't care)
.
.
BLOCK DIAGRAM
O1
O
utput
1
LO Limit
0.0
A
A
nalog Input
.
.
S
et
SR FLIP-FLOP
O1
O
utput
1
SR FLIP-FLOP
SRF_
ESN =
000
S
E
E
xec.
S
eq.
N
o.
(H)
................. 001 to 250
R
T
U
P
N
I
INPUT R
(H)
..........
loop tag.block tag.output (null)
R
eset
R
S
T
U
P
N
I
SN
INPUT S
(H)
..........
loop tag.block tag.output (null)
LPU TSA
P
ower
U
p
LAST
(S)
.................. NO/YES (YES)
SQUARE ROOT
O1
O
utput
1
SQUARE ROOT
SRT_
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
A
nalog Input
A
P
N

Siemens 353 Specifications

General

Brand	Siemens
Model	353
Category	Controller
Language	English