Rosemount 752, Справочное руководство, Страница: 9 / 60

Reference Manual
00809-0100-4377, Rev BA
September 2010
1-3
Rosemount 752
F
OUNDATION
FIELDBUS
FUNCTION BLOCKS
For reference information on the LCD Transducer and Advanced Diagnostics
Transducer blocks refer to “Foundation Fieldbus Block Information” on
page A-1. Reference information on the ISEL, INT, ARTH, SGCR and PID
blocks can be found in the Function Block manual document number
00809-0100-4783.
Resource Block (1000)
The Resource block contains diagnostic, hardware and electronics
information. There are no linkable inputs or outputs to the Resource Block.
LCD Transducer Block (1100)
The LCD Transducer Block is used to configure the LCD meter.
PID Block (1200)
The PID Function Block combines all of the necessary logic to perform
proportional/integral/derivative (PID) control. The block supports mode
control, signal scaling and limiting, feed forward control, override tracking,
alarm limit detection, and signal status propagation.
The block supports two forms of the PID equation: Standard and Series. You
can choose the appropriate equation using the MATHFORM
parameter. The
Standard ISA PID equation is the default selection.
Input Selector Block (1300)
The Input Selector (ISEL) Function Block can be used to select the first good,
Hot Backup, maximum, minimum, or average of as many as eight input
values and place it at the output. The block supports signal status
propagation.
Signal Characterizer Block (1400)
The Signal Characterizer (SGCR) Function Block characterizes or
approximates any function that defines an input/output relationship. The
function is defined by configuring as many as twenty X,Y coordinates. The
block interpolates an output value for a given input value using the curve
defined by the configured coordinates. Two separate analog input signals can
be processed simultaneously to give two corresponding separate output
values using the same defined curve.
Arithmetic Block (1500)
The Arithmetic (ARTH) Function Block provides the ability to configure a
range extension function for a primary input. It can also be used to compute
nine different arithmetic functions.
Integrator Block (1600)
The Integrator (INT) Function Block integrates one or two variables over time.
The block compares the integrated or accumulated value to pre-trip and trip
limits and generates discrete output signals when the limits are reached.