Ainu_ - Analog Inputs, Universal - Siemens Moore 353 User Manual

UM353-1

3.2.10 AINU_ - Analog Inputs, Universal

AINU_ function blocks are available on the optional I/O
Expander Board. These function blocks convert sensor inputs
such as T/C (thermocouple), RTD (resistance temperature
detector), millivolt, ohm, and slidewire sources into block
outputs. Current inputs (i.e. 4-20 mA) are accommodated by
using the WMV type and connecting a 3.75Ω resistor across
the input. An output bias can be used to nullify any known
offset in the sensor circuit and a digital filter (time constant)
is included, to dampen process noise. Output QS indicates the
quality status of the output signal O1 and will go high (1)
when the output is of bad quality. Bad quality indicates an
A/D conversion failure or an open circuit T/C, or an out of
range process variable.
The scaling function is used to establish an output range, in
engineering units, for the selected sensor range (e.g. 0-10 mv
or 50.0-150.0 amperes). Direct Temperature Measurements
(i.e. T/C and RTD) bypass sensor and range scaling and the
block output units are selected from Table 3.4. When
selected, the proper read only ASCII characters
corresponding to the type units selected will automatically be
placed in the ENG UNITS parameter. When OHMs or MVs are selected, the ENG UNITS parameter can be
configured to correspond to the process engineering units. The default SEN MIN and MIN SCALE are set to the
minimum operating value and the SEN MAX & MAX SCALE are set to the maximum operating value. SEN MIN
& SEN MAX always indicate the sensor range limits in degrees C. However, it is important to enter the actual
intended operating range in the MINSCALE, MAXSCALE, and DPP parameters so that other function blocks, such
as the controller, operator faceplate, and workstation interface, can point to this block for range and display
informationBlock names (IDs). Input terminations (terminal numbers) are listed in Section 8.4.
All input types are factory calibrated and do not require field calibration. However, for those cases where outputs
must be adjusted to meet a local standard, a field calibration feature is available to override the factory calibration
for the input type selected. The factory calibration is retained so that the input can be returned to the factory
calibration at any time by storing 'FAC' in the calibration selection. Table 3.5 provides the input values that are
used to perform a field calibration. A verify mode is available during calibration to view the sensor input over the
full range. The signal that is viewed, in the calibration verify mode, is in the basic units of measure (e.g. °C for
temperature, mv for millivolts) and is not affected by the temperature units conversion, digital filter, scaling, or the
output bias adjustment. The full block output with these parameters applied can be viewed in the VIEW mode
within loop configuration. During a hot, a warm or a cold start, the function block will temporarily by-pass the
digital filter to enable the output to initialize at the actual hardware input signal. Note that the field calibration is
erased when the SENsor TYPE is changed.
SLIDE WIRE OHM
b -----
a -----
.
d -----
c -----
Models 353 Models 353
and 354 only and 354 only
March 2003
MV RTD
T/C
+
T/C
+
Universal
MV Converter Converter
_
RJ
_
BLOCK DIAGRAM
ANALOG INPUT- UNIVERSAL_
AINU_
AINU_a
ANALOG INPUT
AINU_b
UNIVERSAL
AINU_c
T/C, RTD, MV, OHMS
SLIDEWIRE
AINU_d
S E N T P E
Y
SENsor TYPE
(H)
S E N M I N
SENsor MINimum
S E N M A X
SENsor MAXimum
D I G F I L T
DIGital FILTer
(S)
O U T B I A S
OUTput BIAS
(S)
M I N S C A L E
MINimum SCALE
M A X S C A L E
MAXimum SCALE
D P P
D P P
ecimal t. osition (preferred) (S) ..... 0.0.0.0.0.0
D T M U N I T S
D T M UNITS
ir. emp. eas.
E N G U N I T S
ENGineering UNITS
C A L T Y P E
CAL TYPE . (
(C) Sen Min/Max Table _ FLD/FAC)
C A L Z E R O ZERO field calibration
C A L F U L L FULL scale field cal
C A L I E W
V
VIEW input - verify cal
ENG UNITS
Digital Range
D/A
Filter Scaling
Bias
Quality Test
Function Blocks
Output Range
OR
Output 1
O1
Quality Status
QS
(Rev. 3)
.. (15)
Cal. Input Values Table
. ..
Sen Min/Max Table (15)
(H)
...
Sen Min/Max Table (75)
(H)
............... 0 to 180 sec (0 sec)
............................ Real (0.0)
...
Sen Min/Max Table (-185)
(H)
..
Sen Min/Max Table (1100)
(H)
0.00
(S) .. Input Types Table (1)
.... Input Types Table (1)
(H)
(FAC)
.
Cal. Input Values Table
(C)
.....
Cal. Input Values Table
(C)
.............. Real
(C)
+
O1
+
.
QS
3-19