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J D F 3 0 0 | F I E L D I N D I C ATO R | O I/ J D F 3 0 0 - E N R E V. B
Algorithm Type
Average
Traditional Summer
Fourth Order Polynomial
Simple HTG Compensated Level
Configuration hints
The minimum configuration for having the AR working and/or moving out from the OOS needs at least the following settings:
• Set ARITH_TYPE with a valid value. It must be different from 0 and in the range 1 – 9
• If the selected ARITH_TYPE is in the range between 1-5 (limited functions), the output limits COMP_HI_LIM > COMP_LO_LIM
• The BAL_TIME must be greater than the Block Execution Time
• When the ARITH_TYPE = 6 (Average) in case of no inputs available the output will be set to NaN (Not a Number)
• Set the GAIN with value different from 0
Block Mapping
Idx
Parameter
0
BLOCK_OBJ
1
ST_REV
2
TAG_DESC
3
STRATEGY
4
ALERT_KEY
TARGET
ACTUAL
5
MODE_BLK
PERMITTED
NORMAL
6
BLOCK_ERR
7
PV
8
OUT
9
PRE_OUT
10
PV_SCALE
11
OUT_RANGE
12
GRANT_DENY
Description
All inputs except IN_LO (not used) are linked together
• The PV is the tank base pressure
• IN_1 is the top pressure (t_1)
• IN_2 is the density correction pressure (t_2)
• GAIN is the height of the density tap
Description / Range / Selections / Notes
In the Block Object data structure, there are different items describing the block characteristics. Execution period,
Number of parameters in the block, the DD Revision, Profile Revision, View Objects characteristics and so on
The revision level of the Static data associated with the Function Block. The revision level is incremented each time a
static parameter value (S – under Storage) in the block is changed.
The user description of the intended application of the block
The strategy field can be used to identify grouping of blocks. This data is not checked or processed by the block.
The identification number of the plant unit. This information may be used in the host for sorting alarms, etc.
AUTO / MAN / OOS
AUTO / MAN / OOS
AUTO
This parameter reflects the error status associated with the hardware or software components associated with a
block. It is a bit string, so that multiple errors may be shown.
The process variable used in block execution, expressed in PV_SCALE unit Code
The block output value calculated as a result of the block
execution, expressed in OUT_RANGE unit code
Expressed in OUT_RANGE unit code
The high and low scale values, engineering units code, and number of digits to the right of the decimal point to be
used in displaying the PV parameter and parameters which have the same scaling as PV.
The high and low scale values, engineering units code, and number of digits to the right of the decimal point to be
used in displaying the scaling for the output. It has no effect on the block
Options for controlling access of host computer and local control panels to operating, tuning and alarm parameters
of the block.
Function
P V
t
_
1
t
_
2
t
_
3
+
+
+
PV +
*
GAIN
OUT =
f
Where ƒ = number of inputs used in computation
(
)
_
1
_
2
_
3
*
P V
+
t
+
t
+
t
OUT =
PV +
2
3
1 _
_
2
_
t
t
t
(
P V
+
+
+
OUT =
PV +
P V
−
t
_
1
PV
*
GAIN
+
BIAS
OUT =
P V
−
t
_
2
PV
The selectable modes by the operator.
The mode the block is currently in.
Allowed modes that the target may take on
The common mode for the Actual.
Writeable only if MODE_BLK .ACTUAL = MAN
Displays what would be the OUT value and status if the
mode was Auto or lower.
35
+
BIAS
GAIN
+
BIAS
4
3
* )
GAIN
+
BIAS
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Troubleshooting
