Honeywell Series A - 3.4 Link and Block Schedules; Link Active Scheduler (LAS) and Link Master

3. Fieldbus Integration With Experion System
3.4. Link and Block Schedules
64 Experion PKS Series A Fieldbus Interface Module User's Guide R400
Honeywell July 2010
Element and Bit Attribute Description
GRANT_DENY.GRANT:0
Program
Operations
Grants permission to higher level
device to change the target mode, set
point or output of a block, depending
on block mode.
GRANT_DENY. GRANT:1 Tune
Grants permission to higher level
device to change tuning parameters of
the block.
GRANT_DENY.GRANT:2 Alarm
Grants permission to higher level
device to change alarm parameters of
the block
GRANT_DENY.GRANT:3
Local
Operations
Grants permission to a local operator's
panel or hand-held device to change
target mode, set point, or output of the
block, depending on block mode.
GRANT_DENY.DENY:0
Program
Operations
Turns off Program Operations
permission grant.
GRANT_DENY.DENY:1 Tune Turns off Tune permission grant.
GRANT_DENY.DENY:2 Alarm Turns off Alarm permission grant.
GRANT_DENY.DENY:3
Local
Operations
Turns off Local Operations grant.
The Grant selections are mutually exclusive. If you select Program Operations, the Local
Operations selection is turned off. If Local Operations is selected, neither an operator nor
a high level device (program) has the right to modify a parameter value of the block.
Note that access by another function block is always granted and is independent of
GRANT_DENY selections. Also, an operator can always change the MODE of a block
with Program or Local Operations Granted. When an operator changes the MODE, it
automatically resets all four Grants to off.
The GRANT_DENY parameter will not track the mode of an associated SCM.
3.4 Link and Block Schedules
Link Active Scheduler (LAS) and Link Master
All links must have a Link Active Scheduler (LAS). The LAS operates at the data link
layer as the bus arbiter for the link. It provides the following functions.