General Block Information; Modes - Emerson Rosemount 3051S Series Reference Manual

Reference Manual
00809-0200-4801, Rev DA
Block execution times
Analog Input = 20 ms
PID = 25 ms
Arithmetic = 20 ms
Input Selection = 20 ms
Signal Characterizer = 20 ms
Integrator = 20 ms
Analog Output = 20 ms
Output Splitter = 20 ms
Multiple Analog Input = 20 ms
Control Selector = 20 ms
3.5

General block information

3.5.1

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.
Configuration
Configuration
October 2016
27