18. Appendix I
18.2. Description
546 Experion PKS Series A Fieldbus Interface Module User's Guide R400
Honeywell July 2010
Tab
Parameter Default Value Description
Slot Time
(LMLSTREC.ST)
8
Indicates the configured slot
time value. It is a fundamental
link parameter with multiple
uses. Each Link Master DLE
connected to the link uses Slot-
time to determine how long that
DLE monitors the link for
inactivity before sending a
CLAIM LAS (CL) DLPDU. Slot-
time is defined such that the
nominal link-inactivity monitoring
periods of two DLEs that have
consecutive node addresses
and do not hold any token differ
by exactly one slot time. Its
range is 1 to 4095, and its unit is
the transmission duration of one
octet. The default value is 8,
which should be valid for most
applications.
Slot-time defines the minimum
upper bound on the maximum
two-way asynchronism in
immediate communications
among interacting DLEs on the
local link when trying to initialize
the link, maximized across all
pairs of DLEs on that local link.
It is an aggregate measure of
the worst-case implementation
delays within the intervening
media, the PhL, and the
PhL/DLL interfaces, all of which
limit the speed of two-way DLE
interaction on the local link.
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