Emerson 848T manual 00809-0100-4697, Rev EA October Block/Transducer Error, Transducer Block Modes

Reference Manual

00809-0100-4697, Rev EA October 2011

Table 3-9. Block/Transducer Error

		Rosemount 848T
ERR	Condition Number, Name, and Description
	0	Other(1)
_BLOCK
	7	Input failure/process variable has bad status
	15	Out of service: The actual mode is out of service

(1) If BLOCK_ERR is “other,” then see XD_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.

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.

3-17