Srf_ - Sr Flip-Flop; Srt_ - Square Root - Siemens 353 User Manual

Function Blocks
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).
SR FLIP-FLOP TRUTH TABLE
S R
S
1 X
Set
R 0 1
. Reset
0 0
0 0
S - SET Input
R - RESET Input
X (don't care)
BLOCK DIAGRAM

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.
LO Limit
A
0.0
.
Analog Input
BLOCK DIAGRAM
3-88
LO O1
X 1
O1
Output 1
X 0
1 1
.
0 0
LO - Last Output
O1 - Output
Output 1
SR FLIP-FLOP
S
Set
R
Reset
P U L A S T
I N P U T S
I P U R
N T
E
S N
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.
SQUARE ROOT
A
Analog Input
O1
I N P U T A
.
E S N
UM353-1B
ESN = 000
SRF_
SR FLIP-FLOP O1
Output 1
Power Up LAST .................. NO/YES
(S)
INPUT S .......... loop tag.block tag.output
(H)
INPUT R ..........
(H) loop tag.block tag.output
Exec. Seq. No. ................. 001 to 250
(H)
ESN = 000
SRT_
SQUARE ROOT
O1 Output 1
INPUT A ...........
loop tag.block tag.output
(H)
E xec. S eq. N o. ................ 001 to 250
(H)
April 2012
(YES)
(null)
(null)
(null)