Reference Manual
00809-0100-4021, Rev FB
August 2011
4-3
Rosemount 3144P
FOUNDATION Fieldbus
NOTE
When an upstream block is set to OOS, it 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 takes over the management of
communications until the host is restored.
The host system provides 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, enter 0x02 to the
BOOT_OPERAT_FUNCTIONAL_CLASS object (Index 605). To
deactivate, enter 0x01.
2. Restart the device.
Capabilities Virtual Communication Relationship (VCRs)
There are 20 VCRs, where one is permanent and 19 are fully configurable by
the host system. Also, thirty link objects are available.
Table 4-1. Network Parameters
Network Parameter Value
Slot Time 8
Maximum Response Delay 2
Maximum Inactivity to Claim LAS Delay 32
Minimum Inter DLPDU Delay 8
Time Sync class 4 (1 ms)
Maximum Scheduling Overhead 21
Per CLPDU PhL Overhead 4
Maximum Inter-channel Signal Skew 0
Required Number of Post-transmission-gab-ext Units 0
Required Number of Preamble-extension Units 1
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