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Function Blocks Instruction Manual
BLOCK_ERR
The BLOCK_ERR of the DENS block will reflect the following causes:
Out of Service – it occurs when the block is in O/S mode.
Supported Modes
O/S, MAN and AUTO.
Mode Handling
Manual mode disconnects the outputs from the algorithm and permits manual substitution of the
OUT, DENS_OUT, OUT_D values for test or other purposes. Although the OUT_D parameter is
also disconnected from the alarm, the alarm and the limits (OUT_HI_LIM and OUT_LO_LIM)
continue to check the output.
Status Handling
The primary input status (IN_1 and IN_2 parameters) are propagated to the outputs.
If the status of any primary input becomes bad or uncertain and their respective option “use
uncertain” of STATUS_OPTS is not set, the actual mode block will be forced to manual and the
algorithm stops the calculation.
If the secondary input (IN_3 parameter) is unusable, the algorithm uses the last usable value and
the output status will be Uncertain.
A bad status in RESET_IN input does not stop the algorithm.
If target mode is Man then the output status is Good.
Parameters
DataType Valid Range/
Default
Units
Store/
Mode
0
None
S/RO
OctString(3
2)
Spaces
Na
S
STRATEGY
Unsigned16
0
None
S
4
ALERT_KEY
Unsigned8
0
None
S
5
MODE_BLK
DS-69
O/S
Na
S
6
BLOCK_ERR
Bitstring(2)
E
D / RO
OUT
D / Man
The analog value calculated as a result of
executing the function.
0-100%
OUT
S / Man
The high and low scale values to the OUT
parameter.
0
E
S / Man
Selection of engineering unit for density.
0
na
D
0
Na
S / O/S
Idx
Parameter
4
ST_REV
Unsigned16
5
TAG_DESC
6
(length)
7
OUT
DS-65
8
OUT_SCALE
DS-68
Options
1 to 255
Value
OUT_SCALE
+/- 10%
Description
See Mode Parameter
0:Plato degree
1:Brix
9
EU_SEL
Unsigned8
10
GRANT_DENY
DS-70
11
STATUS_OPTS
Bitstring(2)
12
IN_1
DS-65
D
The first input (pressure P1) must have the same
engineering units of IN_2.
13
IN_2
DS-65
D
The second input (pressure P2) must have the
same engineering units of IN_1.
14
IN_3
DS-65
D
The third input. (Temperature T in Degrees
Celsius)
15
PRESSURE_UNITS
Unsigned16
S
This is the pressure engineering unit of IN_1 and
IN_2.
2:TC
3:INPM
2.120
See Block
Options
See valid
pressure units
1144
(g/cm2)
E
See Block Options