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Reference Manual
00809-0100-4697, Rev EA
October 2011
3-17
Rosemount 848T
Table 3-9. Block/Transducer
Error
Transducer Block Modes
The transducer block supports two modes of operation as defined by the
MODE_BLK parameter:
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.
BLOCK_ERR
Condition Number, Name, and Description
0 Other
(1)
(1) If BLOCK_ERR is “other,” then see XD_ERROR.
7 Input failure/process variable has bad status
15 Out of service: The actual mode is out of service
Table 3-10. 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.
11 XD_ERROR Provides additional error codes related to transducer blocks. For a list of enumeration
values, see FF-902. Please see tables below for a list of sub-parameters that pertain to
XD_ERROR messages.