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Reference Manual
00809-0100-4021, Rev DA
November 2004
4-3
Rosemount 3144P
FOUNDATION Fieldbus
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:
Link Active Scheduler The 3144P can be designated to act as the backup Link Active Scheduler
(LAS) in the event that the designated LAS is disconnected from the segment.
As the backup LAS, the 3144P will take over the management of
communications until the host is restored.
The host system may provide a configuration tool specifically designed to
designate a particular device as a backup LAS. Otherwise, this can be
configured manually as follows:
1. Access the Management Information Base (MIB) for the 3144P.
To activate the LAS capability, write 0x02 to the
BOOT_OPERAT_FUNCTIONAL_CLASS object (Index 605). To
deactivate, write 0x01.
2. Restart the device.
Block Instantiation Rosemount devices are pre-configured with function blocks at the factory, the
default configuration for the 3144P is listed below. The 3144P can have up to
three additional instantiated function blocks (nine instantiated, four
permanent, three additional).
• 3 Analog Input Blocks (tag names AI 1400, AI 1500, AI 1600)
• 2 Proportional/Integral/Derivative Block (tag name PID 1700, PID 1800)
• Input Selector (tag names ISEL 1900)
• Signal Characterizer (tag name CHAR 2000)
• Arithmetic (tag name ARTH 2100)
• Output Splitter (tag name OSPL 2200)
The four permanent blocks are as follows:
•Resource
•Transducer
•LCD
•SPM
The 3144P supports the use of Function Block Instantiation. When a device
supports block instantiation, the number of blocks and block types can be
defined to match specific application needs.The number of blocks that can be
instantiated is only limited by the amount of memory within the device and the
block types that are supported by the device. Instantiation does not apply to
permanent device blocks like the Resource, Sensor Transducer, LCD
Transducer, and Advanced Diagnostics Blocks.
By reading the parameter “FREE_SPACE” in the Resource block you can
determine how many blocks you can instantiate. Each block that you
instantiate takes up 4.5% of the “FREE_SPACE”.
Resource
Block
Transducer
Block
Analog Input
(AI Block)
Other
function
blocks