Emerson 3051S manual General Block Information, Modes, Auto, Man

Reference Manual

00809-0200-4801, Rev BA April 2007

Rosemount 3051S

GENERAL BLOCK

INFORMATION

Modes	The Resource, Transducer, and all function blocks in the device have modes
	of operation. These modes govern the operation of the block. Every block
	supports both automatic (AUTO) and out of service (OOS) modes. Other
	modes may also be supported.
	Changing Modes
	To change the operating mode, set the MODE_BLK.TARGET to the desired
	mode. After a short delay, the parameter MODE_BLOCK.ACTUAL should
	reflect the mode change if the block is operating properly.
	Permitted Modes
	It is possible to prevent unauthorized changes to the operating mode of a
	block. To do this, configure MODE_BLOCK.PERMITTED to allow only the
	desired operating modes. It is recommended to always select OOS as one of
	the permitted modes.
	Types of Modes
	For the procedures described in this manual, it will be helpful to understand
	the following modes:
	AUTO
	The functions performed by the block will execute. If the block has any
	outputs, these will continue to update. This is typically the normal
	operating mode.
	Out of Service (OOS)
	The functions performed by the block will not execute. If the block has any
	outputs, these will typically not update and the status of any values passed
	to downstream blocks will be “BAD”. To make some changes to the
	configuration of the block, change the mode of the block to OOS. When
	the changes are complete, change the mode back to AUTO.
	MAN
	In this mode, variables that are passed out of the block can be manually
	set for testing or override purposes.
	Other Types of Modes
	Other types of modes are Cas, RCas, ROut, IMan and LO. Some of these
	may be supported by different function blocks in the Rosemount3051S.
	For more information, see the Function Block manual, document
	00809-0100-4783.
	NOTE
	When an upstream block is set to OOS, this will impact the output status of all
	downstream blocks. The figure below depicts the hierarchy of blocks:

Resource

Block

Transducer

Block

Analog Input (AI Block)

Other

function

blocks

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