Yokogawa EJX115A - Manual (Page 41)

<6. Explanation of Basic Items>
6-8
IM 01C25T04-01EN
6.5.3 Totalizer Value Set (SET_TOT)
Reset of the internal value of the function block
algorithm to 0 or set this value to which configured
in Preset Value (PRESET_VALUE). This parameter
affects the current totalized value immediately. This
function is level sensitive. While this is set to Reset
or Preset, the status of the totalized value shall be
UNCERTAIN-initial value. The parameter Totalized
Value (TOTAL) is affected if the block is in Auto
Mode.
Totalized
Value
SET_TOT
0.0
UNCERTAIN-init
value
PRESET_TOT
UNCERTAIN-init
value
Time
Time
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0.0
2
1
0
The following selections of this function block
parameter are possible.
0: Totalize: Normal operation of the Totalizer
1: Reset; Assign value 0 to Totalizer
2: Preset; Assign value of Present Value to
Totalizer
6.5.4 Mode (MODE_TOT)
This parameter governs the behavior of the
totalization. The following selections are possible:
Pos. and neg. values; True arithmetic integration of
the incoming rate values.
Positive values only; Totalization of positive
incoming rate values only.
Negative values only; Totalization of negative
incoming rate values only.
Hold Count; Totalization stopped.
6.5.5 Fail Safe Mode (FAIL_TOT)
Fail safe mode of the Totalizer function block. This
parameter governs the behavior of the function
block during the occurrence of input values with
BAD status. The following selections are possible.
Run; Totalization is continued using the input values
despite the BAD status. The status is ignored.
Hold; Totalization is stopped during occurrence of
BAD status of incoming values.
Memory; Totalization is continued based on the last
incoming value with GOOD status before the first
occurrence of BAD status.
Table 6.4 Fail Safe Mode (Classic Status)
FAIL_TOT mode TOTAL Value and Status(Quality) * 1
Run value Totalization is continued using the
input values
Status UNCERTAIN - Non Specific
Hold value Totalization is stopped
Status UNCERTAIN - Last Usable Value
Memory value Totalization is continued based on
the last incoming value with GOOD
status
Status UNCERTAIN - Non Specific
*1: When SET_TOT=TOTALIZE & MODE_TOT<>HOLD,
input status <> out of serivce
Table 6.5 Fail Safe Mode (Condensed Status)
FAIL_TOT mode TOTAL Value and Status(Quality) * 1
Run value Totalization is continued using the
input values
Status BAD - *(* same as input)
Hold value Totalization is stopped
Status BAD - *(* same as input)
Memory value Totalization is continued based on
the last incoming value with GOOD
status
Status UNCERTAIN - Substitute set
*1: When SET_TOT=TOTALIZE & MODE_TOT<>HOLD,
input status <> BAD - Passivated
Value, Status
AUTO
MAN
TOTAL
OS
TOTAL
TOTAL
MODE_BLK. Actual
PV from TB
(CHANNEL)
Fail safe
handling
FAIL_TOT
Totalize mode
handling
MODE_TOT
Totalize start /
reset /preset
handling
SET_TOT
Totalization
Limit Check
HI, HI_HI
LO, LO_LO
Value, Status
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Figure 6.4 Totalizer Function Block