Allen-Bradley LOGIX 5000 User Manual

Process Control Instructions
Chapter 1
Rockwell Automation Publication 1756-RM006K-EN-P - November 2018 63
LEAD_LAG Structure
Input Parameter Data Type Description
EnableIn BOOL Enable input. If cleared, the instruction does not execute and
outputs are not updated.
Default is set.
In REAL The analog signal input to the instruction.
Valid = any float
Default = 0.0
Initialize BOOL Request to initialize filter control algorithm. When Initialize is
set, Out = (In x Gain) + Bias.
Default = cleared
Lead REAL The lead time in seconds. Set Lead = 0.0 to disable the lead
control algorithm. If Lead < 0.0, the instruction sets the
appropriate bit in Status and limits Lead to 0.0. If Lead >
maximum positive float, the instruction sets the appropriate
bit in Status.
Valid = any float 0.0
Default = 0.0
Lag REAL The lag time in seconds. The minimum lag time is DeltaT/2. If
Lag < DeltaT/2, the instruction sets the appropriate bit in
Status and limits Lag to DeltaT/2. If Lag > maximum positive
float, the instruction sets the appropriate bit in Status.
Valid = any float DeltaT/2
Default = 0.0
Gain REAL The process gain multiplier. This value allows the simulation of
a process gain. The In signal is multiplied by this value. I = (In
x Gain) + Bias
Valid = any float
Default = 1.0
Bias REAL The process offset level. This value allows the simulation of an
ambient condition. This value is summed with the results of
the multiplication of In times Gain. I = (In x Gain) + Bias
Valid = any float
Default = 0.0
TimingMode DINT Selects timing execution mode.
0 = Periodic rate
1 = Oversample mode
2 = Real-time sampling mode
Valid = 0 to 2
Default = 0
For more information about timing modes, see Function Block
Attributes.
OversampleDT REAL Execution time for oversample mode.
Valid = 0 to 4194.303 seconds
Default = 0
RTSTime DINT Module update period for real time sampling mode
Valid = 1 to 32,767ms
Default = 1
RTSTimeStamp DINT Module time stamp value for real time sampling mode.
Valid = 0 to 32,767ms
Default = 0

Allen-Bradley LOGIX 5000 Specifications

General

Brand	Allen-Bradley
Model	LOGIX 5000
Category	Controller
Language	English