Filter
Top Products
Reference Manual
00809-0200-4801, Rev BA
April 2007
Rosemount 3051S
3-16
Advanced Features The AI Function Block provides added capability through the addition of the
following parameters:
ALARM_TYPE
ALARM_TYPE allows one or more of the process alarm conditions detected
by the AI function block to be used in setting its OUT_D parameter.
OUT_D
OUT_D is the discrete output of the AI function block based on the detection
of process alarm condition(s). This parameter may be linked to other function
blocks that require a discrete input based on the detected alarm condition.
MULTIPLE ANALOG
INPUT (MAI) FUNCTION
BLOCK
The Multiple Analog Input (MAI) function block has the ability to process up to
eight field device measurements and make them available to other function
blocks. The output values from the MAI block are in engineering units and
contain a status indicating the quality of the measurement. The measuring
device may have several measurements or derived values available in
different channels. Use the channel numbers to define the variables that the
MAI block processes.
The MAI block supports signal scaling, signal filtering, signal status
calculation, mode control, and simulation. In Automatic mode, the block’s
output parameters (OUT_1 to OUT_8) reflects the process variable (PV)
values and status. In Manual mode, values may be set manually. The Manual
mode is reflected on the output status. The MAI block parameters and their
units of measure, descriptions, and index numbers are listed.
Figure 3-4. Multiple Analog Input
Function Block Timing Diagram
Block Errors
Table 3-6 lists conditions reported in the BLOCK_ERR parameter. Conditions
in bold are inactive for the MAI block and are given for reference.
Out1 = The block output value and status
for the first channel.
OUT_1
MAI
OUT_2
OUT_3
OUT_4
OUT_5
OUT_6
OUT_7
OUT_8
PV_FTIME
63% of Change
OUT (mode in man)
OUT (mode in auto)
PV
Time (seconds)
FIELD_VAL