Emerson Rosemount 848T, Reference Manual, Page: 51 / 136

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Reference Manual
00809-0100-4697, Rev GA
Section 3: Configuration
November 2014
Configuration
Automatic (Auto)
The block outputs reflect the analog input measurement.
Out of Service (OOS)
The block is not processed. Channel outputs are not updated and the status is set to Bad: Out of
Service for each channel. The BLOCK_ERR parameter shows Out of Service. In this mode,
changes can be made to all configurable parameters. The target mode of a block may be
restricted to one or more of the supported modes.
Transducer block alarm detection
Alarms are not generated by the transducer block. By correctly handling the status of the
channel values, the down stream block (AI or MAI) will generate the necessary alarms for the
measurement. The error that generated this alarm can be determined by looking at BLOCK-ERR
and XD_ERROR.
Transducer block status handling
Normally, the status of the output channels reflect the status of the measurement value, the
operating condition of the measurement electronics card, and any active alarm conditions. In a
transducer, PV reflects the value and status quality of the output channels.
Table 3-15. Transducer Block Parameters
Number Parameter Description
0 BLOCK
1 ST_REV The revision level of the static data associated with the
function block.
2 TAG_DESC The user description of the intended application of the
block.
3 STRATEGY The strategy field can be used to identify grouping of
blocks.
4 ALERT_KEY The identification number of the plant unit.
5 MODE_BLK The actual, target, permitted, and normal modes of the
block.
6 BLOCK_ERR This parameter reflects the error status associated with
the hardware or software components associated with a
block. Multiple errors may be shown. For a list of
enumeration values, see FF-890, Block_Err formal model .
7 UPDATE_EVENT This alert is generated by any change to the static data.
8 BLOCK_ALM The BLOCK-ALM is used for all configuration, hardware,
connection failure 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 attribute. As soon as the Unreported status is
cleared by the alert reporting task, another block alert
may be reported without clearing the Active status, if
the subcode has changed.
9 TRANSDUCER_DIRECTORY A directory that specified the number and stating
indices of the transducers in the transducer block.
10 TRANSDUCER_TYPE Identifies the transducer that follows 101 – Standard
Temperature with Calibration.