L9P_LIMV: Velocity Limiter for Changes in the Pv
(Original Document)
About us
Naming
Name in LL984 Editor
Function Block Name
name of legacy 984 instruction
name in other tools and editors like:
  • Type Library Browser
  • Data Editor
  • Animation Tables
  • Search Results
Function Description
The L9P_LIMV DFB limits the velocity of change in the input variable between a specified high and low value. If the high or low limit is reached, the function sets an H or L flag and clamps the output.
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...14] OF UINT
%MW
see Parameter PAR below
Bottom
IN
LEN
UINT
14
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...14] of UINT
Word
Content
Format
1, 2
current input
REAL (Floating Point)
3
output status
UINT
4
input status
UINT
5
time word
UINT
6
reserved
UINT
7, 8
time (in ms) since last solve
DINT
9, 10
solution interval (in ms)
DINT
11, 12
velocity limit / sec
REAL (Floating Point)
13, 14
output (result)
REAL (Floating Point)
Output Status
Control Expert-IEC bits
Function
0...7
standard output bits (flags)
8
1 = input > high limit
9
1 = input < low limit
10
1 = negative velocity limit
11...15
not used
Input Status
Control Expert-IEC bits
Function
0...11
not used
12...15
standard input bits (flags)