Siemens LR 460 Manual De Usuario
7ML19985JM01
SITRANS LR 460 (PROFIBUS PA) – INSTRUCTION MANUAL
Page J-103
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Output Conversion
Values transmitted by the TB have a status attached. The decision on what to do with
each value is made by the Analog Input Function Block.
each value is made by the Analog Input Function Block.
Device/ Input Simulation
The input can be a simulated value instead of a TB OUT value. This allows the AI block to
be tested independently of the characteristics of the environment.
be tested independently of the characteristics of the environment.
Fail-safe
•
If the status of the Primary Value or Simulation Value is bad, the fault logic can
output either the last usable measured value, or a given substitute value.
output either the last usable measured value, or a given substitute value.
Device / Output Simulation
One of three settings can be selected. The result is the output parameter (OUT).
AIFB execution steps:
The AIFBs can provide a linear conversion to any desired units.
1.
The input value is normalized (Scaling Input)
Process Variable range applies to any of the four TB values. (Units of the Process
Variable scale are the same as the units used for the TB output.) Output units
together with Process Variable range determine how the TB output is converted to
whatever units the customer wants.
together with Process Variable range determine how the TB output is converted to
whatever units the customer wants.
2.
The scaling output is applied.
For example:
Setting
description
Output value
AUTO
automatic
the automatically-recorded measured value
MAN
manual
a manually-set fixed simulation value
O/S
function block disabled
the preset safety value.
0
1
2
3
4
5
6
1
2
3
4
5
AIFB
2
Pr
oc
es
s V
ar
ia
bl
e r
ang
e
(typ
ic
al
In
pu
t (0
to
10
0%
)
Output range:
Out (or AIFB
2
Out)
straight to LCD
(same values displayed
on LCD as PLC)