Ll_ - Lead/Lag; Lmt_ - Limit - Siemens Moore 353 User Manual

Function Blocks

3.2.55 LL_ - Lead/Lag

LL_ function blocks provide both lead and lag functions.
The block can function as lag only by setting the TLEAD
time to 0.0. The lag function is always active and has a
minimum setting of 0.01 minutes.
Input E asserted high (1) will enable the Lead/Lag
function. When asserted low (0), the Lead/Lag function
will be bypassed and the output will be set equal to the
input. If input E is not configured, the block will be
enabled.
t
+ 1
Lead
A
t
+ 1
Analog Input
Lag
E
Enable
BLOCK DIAGRAM

3.2.56 LMT_ - Limit

LMT_ function blocks are used to limit a real signal.
Input A will normally pass through the function block to
the output O1. If the input exceeds one of the limits, the
block will output the limit value.
If the HI LIMIT is set lower than the LO LIMIT, the block
will output the high limit value. The output statuses will
be high (1) when the block is in a limit condition.
A
HI SELECTOR
.
LO LIMIT
BLOCK DIAGRAM
3-58
POWER UP - During a warm or cold start, the dynamic
O1
Output 1 elements and the output will be initialized to the value of
the current input on the first scan.
LO SELECTOR O1
Output 1
HS
High limit Status
.
LS
Low limit Status
HI LIMIT
LEAD/LAG
LL_ ESN = 000
Analog Input A
LEAD/LAG
Enable E
L G
T A
Time - LAG (min)
T L E A D
Time - LEAD (min)
N P U A
I T
INPUT A ..........
(H)
P
I N U T E
INPUT E ...........
(H)
E S N
Exec. Seq. No.
(H)
LIMIT
LMT_ ESN = 000
A
Input A LIMIT
H I L I M I T
HIgh LIMIT ........................... Real (100.00)
(S)
L O L I M I T
LOw LIMIT ........................... Real
(S)
I N T A
P U
.....
INPUT A
(H)
E S N
Exec. Seq. No.
UM353-1
O1
Output 1
....... 0.01 - 10000.0 (0.10)
(S)
..... 0.00 - 10000.0 (0.00)
(S)
loop tag.block tag.output (null)
loop tag.block tag.output (null
)
................. 001 to 250
O1 Output 1
HS
High Status
LS
Low Status
(0.00)
loop tag.block tag.output (null)
............ 001 to 250
(H)
March 2003