Emerson Rosemount 848T, Reference Manual, Page: 117 / 136

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Reference Manual
00809-0100-4697, Rev GA
Appendix D: Function Blocks
November 2014
Function Blocks
7 CHANNEL None Allows for custom channel setting. Valid values include:
0: Unitialized
1: Channels 1 to 8 (index values 27 to 34 can only be set
to their corresponding channel number, i.e.
CHANNEL_X=X)
2: Custom settings (index values 27 to 34 can be
configured for any valid channel as defined by the DD)
8, 9, 10,
11, 12,
13, 14,
15
OUT (1, 2, 3, 4,
5, 6, 7, 8)
EU of
OUT_SCALE
The block output value and status
16 UPDATE_EVT None This alert is generated by any change to the static data
17 BLOCK_ALM None The block alarm is used for all configuration, hardware
connection feature, or system problems in the block.
The cause of the alert is entered in the subcode field.
The first alert to become active will set the Active status
in the Status parameter. As soon as the Unreported
status is cleared by the alert reporting task, another
block may be reported without clearing the Active
status, if the subcode has changed.
18 SIMULATE None A group of data that contains the current sensor
transducer value and status, and the enable/disable bit.
19 XD_SCALE None The high and low scale values, engineering units code
and number of digits to the right of the decimal point
associated with the channel input value. The XD_SCALE
units code must match the units code of the
measurement channel in the transducer block. If the
units do not match, the block will not transition to MAN
or AUTO. It will automatically change units in the STB
block to the last one written. Multiple blocks reading the
same channel may conflict (only one unit type per
channel).
20 OUT_SCALE None The high and low scale values, engineering unit code
and number of digits to the right of the decimal point
associated with OUT.
21 GRANT_DENY None Options for controlling access of host computers and
local control panels for operating, tuning, and alarm
parameters of the block. Not used by device.
22 IO_OPTS None Allows the selection of input/output options used to
alter the PV. Low cutoff enabled is the only selectable
option.
23 STATUS_OPTS None Allows the user to select options for status handling and
processing. The options supported in the MAI block are
the following:
• Propagate fault forward
• Uncertain if limited
• Bad if limited
• Uncertain if manual mode
24 L_TYPE None Linearization type. Determines whether the field value is
uses directly (Direct), is converted linearly (Indirect), or
is converted with the square root (Indirect Square Root)
25 LOW_CUT % If percentage value of the sensor transducer input falls
below this, PV = 0
26 PV_FTIME Seconds The time constant of the first-order PV filter. It is the
time required for a 63% change in the IN value.
Table D-4. Multiple Analog Input Function Block Parameters
Number Parameter Units Description