72 OI/266/FF/ADD-EN Rev. B
| 2600T Series Pressure transmitters
266 Models - FOUNDATION Fieldbus
Operating Mode
In manual mode, the outputs are disconnected from the algorithm and the user can set the values of OUT, RTOTAL, OUT_TRIP
and OUT_PTRIP for test purposes. No integration takes place. When the block is switched to Auto, the integration starts from
the value set manually. Each write to OUT or RTOTAL shall increment the N_RESET counter. In auto mode, the outputs follow
the algorithm.
Diagnostic
Block_Err
Possible Reasons
OUT Status
Block Configuration error
– TIME_UNIT1 = 0
– TIME_UNIT2 = 0
– INTEG_TYPE = 0
– IF INTEG_OPTS = IN_1 ACCUMULATE
o PULSE_VAL1 = 0
– IF INTEG_OPTS = IN_2 ACCUMULATE
o PULSE_VAL2 = 0
– IF INTEG_TYPE = PERIODIC
o CLOCK_PER = 0
BAD + Out Of Service
See Note A
Input Failure/process
variable has BAD status
The value linked in input coming from the upstream blocks has BAD Status.
Calculated according the algorithm.
See the OUT STATUS section below
Out-of-Service
The Actual_Mode is OUT OF SERVICE
BAD + Out Of Service
NOTE A:
The specific block cannot be switched out from OUT OF SERVICE due to the Configuration Error. The Bad-Configuration
Error Status is overridden by the Bad-Out Of Service Status.
OUT status
If an input has a status of Uncertain or Bad, it shall be treated as explained below. The limit status of the inputs is ignored, as is the
substatus. Either Good(C) or Good(NC) are 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 may be determined by calculating the value of PCT_INCL from Rtotal and Atotal.
Since 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 msp is used to mean “most significant part” 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 shall be Good, or else if PCT_INCL ≥ UNCERT_LIM, the sta-
tus of OUT shall be Uncertain, or else the status of OUT shall be Bad.
If the block mode is Manual, then the status of OUT, OUT_PTRIP, and OUT_TRIP will be 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
will be Uncertain constant. No limits are applied to the output.
