Signal Processing In The Analogue Input Function Block - Endress+Hauser iTEMP TMT 165 FOUNDATION Fieldbus Betriebsanleitung

FOUNDATION Fieldbus temperature transmitter
Endress+Hauser

11.6.1 Signal processing in the Analogue Input Function Block

The figure shows the internal structure of the Analogue Input Function Blocks:
Fig. 11-2: Construction of the analogue function blocks
The Analogue Input Function Block receives its input value from the Transducer Block.
The parameter CHANNEL (see page 130) is used to select which input value is to be
processed by the Analogue Input Function Block.
The parameter group SIMULATE (see page 135) allows you to replace the input value
with a simulation value and to activate simulation. By specifying the status and the
simulation value the reaction of the complete Analogue Input Function Block can be
tested.
In the parameter PV_FTIME (see page 134) a filter time can be specified for filtering the
converted primary value (PV). If a time of 0 seconds is specified then no filtration takes
place.
The parameter group MODE_BLK (see page 134) is used to select the operating mode
of the Analogue Input Function Block. If the operating mode MAN (manual) is selected
then the output value OUT (see page 134) can be specified directly.
The output value OUT is compared with warning and alarm limits (e.g. HI_LIM,
LO_LO_LIM etc.) that can be entered via various parameters. If one of these limit values
is violated then a limit value process alarm (e.g. HI_ALM, LO_LO_ALM etc.) is triggered.
The major functions and parameters of the Analogue Input Function Block are listed
below; you will find an overview of all the available parameters starting on page 127.
11 Appendix
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