Emerson manual Rosemount 848L, Reference Manual, Multiple Discrete Output Block

Reference Manual

00809-0100-4696, Rev AA September 2004

Table C-6. Parameters and Description

Rosemount 848L

Index	Parameter	Description
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:
		Target: The mode to .go to.
		Actual: The mode the .block is currently in.
		Permitted: Allowed modes that target may take on
		Normal: Most common mode for actual
6	BLOCK_ERR	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.
7	CHANNEL	The CHANNEL value is used to select the measurement value. Refer to the appropriate device
		manual for information about the specific channels available in each device. You must configure the
		CHANNEL parameter before you can configure the XD_SCALE parameter.
8	OUT_D1	Discrete output to indicate a selected alarm condition.
9	OUT_D2	Discrete output to indicate a selected alarm condition.
10	OUT_D3	Discrete output to indicate a selected alarm condition.
11	OUT_D4	Discrete output to indicate a selected alarm condition.
12	OUT_D5	Discrete output to indicate a selected alarm condition.
13	OUT_D6	Discrete output to indicate a selected alarm condition.
14	OUT_D7	Discrete output to indicate a selected alarm condition.
15	OUT_D8	Discrete output to indicate a selected alarm condition.
16	UPDATE_EVT	This alert is generated by any change to the static data.
17	BLOCK_ALM	The block alarm 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 parameter. 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.

MULTIPLE DISCRETE OUTPUT BLOCK

The MDO block makes available to the I/O subsystem its eight input parameters IN_D1/8.

This function block keeps the fault state features specified for the DO block. It includes option to hold the last value or a preset value when in Fault State, individual preset values for each point, and a delay time to go into the Fault State.

The actual mode will be LO only due to the resource block (SET_FSTATE parameter). If an input parameter has a bad status, that parameter will be in Fault State, but the mode calculation of the block will not be affected.

The parameter FSTATE_STATUS shows that points are in Fault State.

The MDO block does not support back calculation, or the Cas mode.

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