Asn_ - Arcsine; Atd_ - Analog Trend Display - Siemens Moore 353 User Manual

Function Blocks

3.2.18 ASN_ - ARCSINE

ASN__ function blocks, in firmware 1.30 and higher, accept an input
between -1.0 and 1.0 and provide an output signal in radians of
which the input is the sine.
X
.
Input X

3.2.19 ATD_ - Analog Trend Display

ATD_ blocks, in firmware 1.30 and higher, can be used as
needed in loops (up to a maximum of 5 per loop) to trend an
analog variable connected to input A. The block can store
up to 170 data points depending upon the use of the
enable/disable function (see below). A trend can be
displayed using Modbus commands. Data can be retrieved
and displayed by a remote operator station that can retrieve,
interpret, and display data packets from the station. A PC or
i|station running i|ware PC operator interface software can
display trend data on a Loop Detail screen or Analog Detail
screen.
Parameter TRND TYP allows data to be stored in one of
two formats: the average over each sample time or the
peak/peak values of the data over each sample time. All
data is stored in a normalized form based on the value of the
RG PTR (range pointer) input. The range information will
be part of the data packet when retrieved over the network
communications. When this input is unconfigured, a range
of 0.0 - 100.0 will be used.
Several inputs can control the operation of the ATD function block. Input E (enable) can be used to enable the trend
function when high (1) or unconfigured. Trend action can be disabled by setting E low (0). Each time the function
block is enabled a new trend packet will be created.
The block also includes parameter OVERWRIT that, when set to YES, will cause the block to overwrite old data
(i.e. circular file). When the parameter is set to NO, the block will stop trending when full and retain the data until
reset. When the full state is reached, output TF (Trend Full) will go high (1). This function can be used to enable a
second ATD block.
3-28
O1
ASIN (X)
Output 1
BLOCK DIAGRAM
ARCSINE
ASN
Input X X
O
I N P U T X
INPUT X ..............
E
S N
Exec. Seq. No. ..................... 000 to 250
.
ANALOG TREND DISPLAY
ATD
ANALOG TREND
R
A
E
R G P T R
RanGe PoinTeR .........
S M P T I M E
SaMPle TIME ....... 0.01 to 480.00 min. (0.10)
T R N D T Y P
TReND TYPe ..
O V E R W R I T
OVERWRITe ......................... YES/NO (YES)
I N P U T A
INPUT A ............
I N P U T E
INPUT E ............
E S N
Exec. Seq. No. ................... 000 to 250
UM353-1
ESN = 000
O1 Output 1
= ASIN (X)
1
loop tag.block tag.output (null)
(000)
Trend Full
TF
loop tag.block tag (null)
(A)
P-P(peak/peak)/A(average)
loop tag.block tag.output (null)
loop tag.block tag.output (null)
(000)
March 2003