Second-Order Lead Lag (Ldl2) - Allen-Bradley LOGIX 5000 Reference Manual

Filter
Second-Order Lead Lag
(LDL2)
Structured Text
NTCH_01.In := frequency_input;
NTCH_01.WNotch := center_frequency;
NTCH_01.QFactor := Notch_width_depth;
NTCH(NTCH_01);
Notch_output := NTCH_01.Out;
See also
Common Attributes
Structured Text Syntax
This information applies to the CompactLogix 5370, ControlLogix 5570,
Compact GuardLogix 5370, GuardLogix 5570, Compact GuardLogix 5380,
CompactLogix 5380, CompactLogix 5480, ControlLogix 5580, and GuardLogix
5580 controllers.
The LDL2 instruction provides a filter with a pole pair and a zero pair. The
frequency and damping of the pole and zero pairs are adjustable. The pole or zero
pairs can be either complex (damping less than unity) or real (damping greater
than or equal to unity).
Available Languages
Ladder Diagram
This instruction is not available in ladder diagram logic.
Function Block
Structured Text
LDL2(LDL2_tag);
Rockwell Automation Publication 1756-RM006K-EN-P - November 2018
on page 537
on page 508
Chapter 3
341