L9P_RATIO: Four Station Ratio Controller
(Original Document)
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Naming
Name in LL984 Editor
Function Block Name
name of legacy 984 instruction
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Function Description
The L9P_RATIO DFB provides a 4-station ratio controller. Ratio control can be used in applications where one or more raw ingredients are dependent on a primary ingredient. The primary ingredient is measured, and the measurement is converted to engineering units via a L9P_AIN DFB. The converted value is used to set the target for the other ratio controlled inputs. Outputs from the ratio controller can provide set points for other controllers. They can also be used in an open loop structure for applications where feedback is not required.
Representation
Parameters
Input Pin
Name
Data Type
Address Range
Meaning
Top
ENABLE
BOOL
–
ON = enables process control function
Node
Node Type
Name
Data Type
Address Range
Meaning
Middle
IN/OUT
PAR
ARRAY[1...20] OF UINT
%MW
see Parameter PAR below
Bottom
IN
LEN
UINT
20
length of parameter block (can not be changed)
Output Pin
Name
Data Type
Address Range
Meaning
Top
OUT
BOOL
–
ON = operation successful
Bottom
ERR
BOOL
–
ON = operation not successful
Parameter PAR
The data type of the parameter block is ARRAY[1...20] of UINT
Word
Content
Format
1, 2
live input
REAL (Floating Point)
3
output status
UINT
4
input status
UINT
5, 6
ratio 1 for input
REAL (Floating Point)
7, 8
ratio 2 for input
REAL (Floating Point)
9, 10
ratio 3 for input
REAL (Floating Point)
11, 12
ratio 4 for input
REAL (Floating Point)
13, 14
output for ratio 1
REAL (Floating Point)
15, 16
output for ratio 2
REAL (Floating Point)
17, 18
output for ratio 3
REAL (Floating Point)
19, 20
output for ratio 4
REAL (Floating Point)
Output Status
Control Expert-IEC bits
Function
0...4
standard output bits (flags)
5
1 = no inputs activated
6
1 = parameter(s) out of range
7...15
not used
Input Status
Control Expert-IEC bits
Function
0...7
not used
8
1= input 4 active
9
1= input 3 active
10
1= input 2 active
11
1= input 1 active
12...15
standard input bits (flags)