SMAR FP302, Owner'S Operation And Maintenance Manual

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FP302 - Operation, Maintenance and Instructions Manual
3.2
CALCULATION AND
CONTROL
FUNCTIONAL BLOCKS
DESCRIPTION
INTG
INTEGRATOR – Integrates a variable in relation to time. There is a second
flow input that can be used for network flow totalizing, volume/mass
variation in vessels, and flow reason accurate control.
AALM
ANALOG ALARM – This alarm block has limits of static or dynamic alarm,
hysteresis, temporary expansion of alarm limits in setpoint steps to avoid
undesirable alarms, two level of alarm limits and delay for alarm detection.
ISEL
INPUT SELECTOR – This block has four analog inputs selected by the
input parameter or according to a criterion rated for good, maximum,
minimum, medium and media.
SPG
SETPOINT RAMP GENERATOR – This block generates the setpoint in
time function. Typical applications are temperature control, batch reactor,
etc.
TIME
TEMPORIZER AND LOGICAL – This block has four discrete inputs
processed by a logical combination. The selected temporizer for the type of
process, works on the combined signal input to produce measuring, delay,
extension, pulse or debounce.
LLAG
LEAD-LAG – This block provides a dynamic compensation for a variable .
It is normally used on feedforward control.
OSDL
OUTPUT SELECTOR / DYNAMIC LIMITATOR – Has two algorithms:
Output Selector – selects the output through a discrete input.
Dynamic Limitator – this algorithm was especially developed for double
crossed limit in combustion control.
CT
CONSTANT – Provides analog and discrete output parameters with
constant values.
FUNCTIONAL BLOCK
OUTPUT
DESCRIPTION
AO
ANALOG OUTPUT – The AO block provides an analog value to generate
an analog output signal. It produces a value and rate limit, scale
conversion, failure status mechanism among other features.
Transducer Block
The transducer block isolates the function block from the I/O hardware, as sensors and actuators.
The transducer block controls the I/0 using the manufacturer’s specific implementation. This makes
possible for the transducer block to execute its tasks and obtain data from the sensors without
overloading the function block currently in use. It also isolates function blocks from some specific
factory characteristics. When accessing the hardware, the transducer block may receive I/O data or
transmit control data to it. The connection between the transducer block and the function block is
called channel.These blocks can exchange data through their interface. In addition, the interface
with functional blocks works through one or more I/O channels whatever the implementation is.
Normally, the transducer blocks execute functions like: linearization, characterization, temperature
compensation, data control and exchange with the hardware.