Emerson Rosemount 848T, Reference Manual, Page: 108 / 136

98
Reference Manual
00809-0100-4697, Rev GA
Appendix D: Function Blocks
November 2014
Function Blocks
05 MODE_BLK None
The actual, target, permitted, and normal modes of
the block.
Actual: The mode the “block is currently in”
Target: The mode to “go to”
Permitted: Allowed modes that target may take on
Normal: Most common mode for target
06 BLOCK_ERR None
This parameter reflects the error status associated
with the hardware or software components
associated with a block. It is a bit string, so that
multiple errors may be shown.
07 PV
EU of
XD_SCALE
The process variable used in block execution.
08 OUT
EU of
OUT_SCALE
or XD_SCALE
if in direct
L_TYPE
The block output value and status.
09 SIMULATE None
A group of data that contains the current transducer
value and status, the simulated transducer value and
status, and the enable/disable bit.
10 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.
11 OUT_SCALE None
The high and low scale values, engineering units code,
and number of digits to the right of the decimal point
associated with OUT when L_TYPE is not direct.
12 GRANT_DENY None
Options for controlling access of host computers and
local control panels to operating, tuning, and alarm
parameters of the block. Not used by device.
13 IO_OPTS None
Allows the selection of input/output options used to
alter the PV. Low cutoff enabled is the only selectable
option.
14 STATUS_OPTS None
Allows the user to select options for status handling
and processing. The options supported in the AI block
are the following:
Propagate fault forward
Uncertain if limited
Bad if limited
Uncertain if Manual mode.
15 CHANNEL None
The CHANNEL value is used to select the
measurement value. Configure the CHANNEL
parameter before configuring the XD_SCALE
parameter. Refer to
Table 3-5 on page 11
.
16 L_TYPE None
Linearization type. Determines whether the field
value is used directly (Direct), is converted linearly
(Indirect), or is converted with the square root
(Indirect Square Root).
17 LOW_CUT %
If percentage value of transducer input fails below
this, PV = 0.
Table D-1. Analog Input Function Block Parameters
Number Parameter Units Description