Revision 4 Foundation Fieldbus RMA803 Remote Indicator User's Guide Page 77
Attributes
Supported
Modes
The block supports the following modes:
• AUTO (Automatic)
• MAN (Manual)
• OOS (Out of Service).
Alarm Types
The block supports standard block alarms, (see section 5.2).
Status
Handling
If an input has status as Uncertain or Bad, then the limit status of
the inputs is ignored, as is the sub status. Either Good(C) or Good
(NC) is accepted as Good.
The increment calculated from an input has an internal status that
is either Good or Bad.
If the input status is Good(C) or Good (NC), the increment status is
Good.
If the input status is Uncertain, the increment status is Bad, and the
last Good value is used unless the option Use Uncertain is set in
INTEG_OPTS, and then the increment status is Good and the new
value is used.
If the input status is Bad, the increment status is Bad, and the last
Good value is used unless the option Use Bad is set in
INTEG_OPTS, and then the increment status is Good and the last
Good value is used.
The two increments are added together, and the resulting status is
the worst of the two. The option Add zero if Bad in INTEG_OPTS
causes the net increment to be zero if its status is Bad.
The percentage of Bad or Uncertain and Bad counts can be
determined by calculating the value of PCT_INCL from Rtotal and
Atotal. As Atotal is the sum of increments with Good and Bad
status, and Rtotal is the sum of increments with Bad status, Atotal
minus Rtotal is exactly equal to the total of increments with Good
status. If most significant part (msp) and Atotal is not zero then
the percent of Good values may be calculated as:
PCT_INCL = 100 * ( 1 - (msp of Rtotal) / (msp of Atotal) )
If Atotal is zero, then PCT_INCL shall be 100 if Rtotal is also zero
or 0 if Rtotal is not zero.
If the block mode is AUTO, if PCT_INCL ≥ GOOD_LIM, the status
of OUT is Good, or else if PCT_INCL ≥ UNCERT_LIM, the status
of OUT is Uncertain, or else the status of OUT is Bad.
If the block mode is Manual, then the status of OUT, OUT_PTRIP,
and OUT_TRIP is Good (NC) constant when then status option
Uncertain, if MAN is not selected. If this status option is selected
and the block mode is manual, then the status of these three
outputs is for Uncertain constant, and no limits are applied to the
output.
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