Endress+Hauser PROFIBUS-DP, Руководство по эксплуатации, Страница: 16 / 52

SmarTec S CLD 132 PROFIBUS-PA/-DP Operation
16 EHauser
Analog Input Block (function block)
In the Analog Input function block, the process variables (conductivity and temperature)
coming from the Transducer Block are prepared, in terms of instrumentation and
control, for the subsequent automation functions, (e.g. scaling and limit value
processing). There are two Analog Input function blocks available for the SmarTec S
PROFIBUS transmitter.
Signal processing
The diagram shows a schematic of the internal structure of an Analog Input function
block:
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The Analog Input function block receives its input value from the Analyser Transducer
Block. The input values are permanently assigned to each Analog Input function block:
•
Main measured value (Main Process Value) – Analog Input function block 1 (AI 1)
•
Temperature measured value (temperature) – Analog Input function block 2 (AI 2)
SIMULATE
In the SIMULATE parameter group you can replace the input value with a simulation
value and activate simulation. By specifying the status and the simulation value, you can
test the reaction of the automation system.
PV_FTIME
In the PV_FTIME parameter you can dampen the converted input value (primary value
= PV) by specifying a filter time. If a time of 0 seconds is specified, the input value is not
dampened.
MODE_BLK
The MODE_BLK parameter group is used to select the operating mode of the Analog
Input function block. By selecting the MAN (manual) operating mode, you can directly
specify the OUT output value and the OUT status.
The most important functions and parameters of the Analog Input Block are listed
below.
A table displaying the functions of the Analog Input Block can be found on Page 33.
HI_HI_ALM HI_ALM LO_ALM LO_LO_ALM
Transducer
Block
ACTUAL_MODE
1
1
1
0
PV
OUT
0
PV_SCALE PV_SCALE_MIN PV_SCALE_MAX OUT_SCALE OUT_SCALE_UNIT OUT_SCALE_MIN OUT_SCALE_MAX HI_HI_LIM HI_LIM LO_LIM LO_LO_LIM ALARM_HYS
HI_HI_ALM HI_ALM LO_ALM LO_LO_ALM
SIMULA
TION
V
ALUE
ST
A
TUS
ON_OFF LIN_TYPE CHANNEL NORMAL_MODE PERMITTED_MODE
ACTUAL_MODE
FSAFE_TYPE FSAFE_V
ALUE
MODE_BLK MAN
MAN
PV_TIME
1
t
FAIL
SAFE OUT
MODE/
STATUS
AUTO
O/S