Emerson Rosemount 2240S, Справочное руководство, Страница: 81 / 194

71
Reference Manual
00809-0100-2240, Rev DA
Configuration/Operation
October 2017
Configuration/Operation
5.9 General block information
5.9.1 Modes
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 Rosemount 2240S. 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.
Figure 5-13 below depicts the hierarchy of blocks.
Figure 5-13. Block Hierarchy
Resource
Block Transducer
Block Analog Input
(AI Block) Other function
blocks