User's Manual

Table Of Contents
A5E32337685 SITRANS LR260 (PROFIBUS PA) – OPERATING INSTRUCTIONS Page 117
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F: Profile structure
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 LTB values. (Units of the Process
Variable scale are the same as the units used for the LTB output.) Output units
together with Process Variable range determine how the LTB output is converted to
whatever units the customer wants.
2. The scaling output is applied.
For example:
3. This value is filtered using a first order filter based on a time constant provided by
the user.
4. The status of the Process Variable (input value) is checked. If the status is Bad, a
Fail-safe condition occurs. The output is determined by the Fail-safe Mode of the
block.
5. The target mode parameter allows the entire AI block to be overridden by a Manual
Out value.
6. The value is checked against the user parameterized warning and alarm limits.
(There is an upper and lower warning limit and an upper and lower alarm limit. The
unit of the limits corresponds to the unit of the output range. A hysteresis parameter
prevents toggling in the Status field of the OUT value.)
7. The OUT VALUE parameter is the value for the cyclic data transfer.
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.
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