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Reference Manual
00809-0100-4530, Rev BA
July 2009
5-37
Rosemount 5300 Series
FOUNDATION Fieldbus
Block Operation
Function blocks within the fieldbus device perform the various functions
required for process control. Function blocks perform process control
functions, such as analog input (AI) functions, as well as proportional-integral
derivative (PID) functions. The standard function blocks provide a common
structure for defining function block inputs, outputs, control parameters,
events, alarms, and modes, and combining them into a process that can be
implemented within a single device or over the fieldbus network. This
simplifies the identification of characteristics that are common to function
blocks.
In addition to function blocks, fieldbus devices contain two other block types
to support the function blocks. These are the Resource block and the
Transducer block.
Resource blocks contain the hardware specific characteristics associated with
a device; they have no input or output parameters. The algorithm within a
resource block monitors and controls the general operation of the physical
device hardware. There is only one resource block defined for a device.
Transducer blocks connect function blocks to local input/output functions.
They read sensor hardware and write to effector (actuator) hardware.
Level Transducer Block
The Level Transducer block contains transmitter information including
diagnostics and the ability to configure, set to factory defaults and restarting
the transmitter.
Register Transducer Block
The Register Transducer Block allows a service engineer to access all
database registers in the device.
Advanced Configuration Transducer Block
The Advanced Configuration Transducer Block contains functions such as
amplitude threshold settings for filtering of disturbing echoes and noise,
simulation of measurement values, and strapping table for volume
measurements.
Resource Block
The Resource block contains diagnostic, hardware, electronics, and mode
handling information. There are no linkable inputs or outputs to the Resource
Block.