18. Appendix I
18.2. Description
542 Experion PKS Series A Fieldbus Interface Module User's Guide R400
Honeywell July 2010
Tab
Parameter Default Value Description
Sample Skew
(SAMPLESKEW)
SKEW
Determines when input blocks
will execute.
Use the SKEW selection to
schedule each input block to
execute at the time closest to
where they converge on a
common block like an input
selector (minimum loop latency).
Use the NO_SKEW selection to
schedule input blocks to
execute at the same time where
they converge on a common
block like an input selector
(minimum scan skew).
Step Timer Preset
(T1)
15.0000s
Specifies the preset time for the
System Management step timer
in seconds. The default value is
specified by the
communications profile for the
application area.
This is an intersequence timer.
It ensures that devices
responding to system
management requests have
sufficient time to carry out
necessary actions and transmit
a response.
System
Management
Preset Set Addr Seq
Timer
(T2)
01:30.0000s
Specifies the preset value for
the System Management set
address sequence timer in
seconds. The default value is
specified by the
communications profile for the
application area.
This is a sequence duration
timer. It ensures that incorrectly
executed or incomplete
sequences are aborted in the
SMK.
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