EasyManuals Logo

Allen-Bradley MicroLogix 1400 User Manual

Allen-Bradley MicroLogix 1400
694 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Page #332 background imageLoading...
Page #332 background image
Publication 1766-RM001A-EN-P - October 2008
330 Process Control Instruction
error, the smaller the output signal. An additional value (feed forward or
bias) can be added to the control output as an offset. The PID result
(control variable) drives the process variable toward the set point.
The PID Equation
The PID instruction uses the following algorithm:
Standard equation with dependent gains:
Standard Gains constants are:
The derivative term (rate) provides smoothing by means of a low-pass
filter. The cut-off frequency of the filter is 16 times greater than the corner
frequency of the derivative term.
Table 4:
Term Range (Low to High) Reference
Controller Gain K
C
0.01…327.67 (dimensionless)
(1)
(1) Applies to MicroLogix 1400 PID range when Reset and Gain Range (RG) bit is set to 1. For more information on reset
and gain, see PLC 5 Gain Range (RG) on page 345.
Proportional
Reset Term 1/T
I
327.67…0.01 (minutes per repeat)
(1)
Integral
Rate Term T
D
0.01…327.67 (minutes)
(1)
Derivative
Output K
C
E()
1
T
I
---- -
E()td
∫
T
D
dPV()
dt
---------------
â‹…++ bias+=
efesotomasyon.com - Allen Bradley,Rockwell,plc,servo,drive

Table of Contents

Other manuals for Allen-Bradley MicroLogix 1400

Questions and Answers:

Question and Answer IconNeed help?

Do you have a question about the Allen-Bradley MicroLogix 1400 and is the answer not in the manual?

Allen-Bradley MicroLogix 1400 Specifications

General IconGeneral
Processor32-bit
Expansion ModulesUp to 7 expansion I/O modules
Power Supply24V DC or 120/240V AC
Programming SoftwareRSLogix 500
Communication PortsEthernet, RS-232/RS-485 combo port
Controller TypeProgrammable Logic Controller (PLC)
SeriesMicroLogix
Digital Outputs12
Analog Inputs6 (embedded)
Analog Outputs2 (embedded)
High-Speed Counter6 high-speed counters
Pulse Output2 (embedded)
Ethernet PortYes

Related product manuals