Configuring the ai blocks of the st100 instrument, Configuring the profile totalizer block – Fluid Components International ST100 Series PROFIBUS PA User Manual
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ST100 Series Profibus PA
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Fluid Components International LLC
Configuring the AI blocks of the ST100 Instrument
The AI blocks are the ones that make the process variables available to the cyclic DPV0 layer of the PROFIBUS protocol. They are use to configure
and set the way that the process data is presented. Each one of the AI blocks has been preset to the designated Transducer Block channel, and the
default prescribed by the profile. These block are also use to set “process alarms”. The AI blocks configurable parameters are the ones designated
by the last columns with a R/W definition in the AI block tables.
Note:
Some of the settable parameters require putting the AI block in an “Out of Service” mode. In order to set the parameter to
put the AI block in the OOS (Out of Service) mode you need to load the value of 80 in hex into the TARGET_MODE parameter.
Then to return the AI block to the AUTO mode you need to load the hex value of 08 in to the TARGET_MODE.
Configuring the Profile TOTALIZER Block
When using the Profile TOTALIZER block confirm that the instrument flow is in volumetric or mass flow. There are 4 parameters that can be used to
manipulate the operation of the Profile TOTALIZER.
SET_TOT:
This parameter is used to set the Profile TOTALIZER block into the “normal” TOTALIZE mode using a value of 0. A value of 1 resets
the TOTALIZER. A value of 2 presets the block.
MODE_TOT:
This parameter controls the behavior of the totalization.
A value of 0: puts it into the BALANCED behavior.
A value of 1: puts it into the POS_ONLY totalization.
A Value of 2: puts it into the NEG_ONLY totalization.
A value of 3: puts it into the HOLD or stop behavior.
FAIL_TOT:
This parameter sets the Fail-safe mode.
A value of 0: RUN - continue totalizing even if the input channel has a BAD status.
A value of 1: HOLD - Totalization stops when the input channel has a BAD status.
A value of 2: MEMORY - continue totalizing using last GOOD value when status is BAD.
PRESET_TOT: This parameter holds the value of the preset to be used by the PRESET mode.