› PLCGurus.NET Live & Interactive Forum › PLC Questions and Answers › Rockwell, Allen-Bradley, Stratix › Frequency response Tests
- This topic has 2 replies, 2 voices, and was last updated 3 years, 5 months ago by
ILC_H.
- AuthorPosts
- June 17, 2020 at 7:26 am #19466
ILC_H
ParticipantKarma: 15Rank: PadawanHi everyone,
So i have a closed loop System, wich consist of a pump and Servomotor controlled with PID-Controller by an Allen-Bradley’s PLC (ControlLogix5561). I need to perform frequency Response Tests on the System in order to obtain the bode Plot (Gain and Phase over Frequency) of the system.
This means i need to generate sine wave at differents frequencies to excit the Systems. The Response of this Input will help me to generate the Bode plot.I am used to Programms application with PLC (specially Siemens s7 1500, I am new to allen Bradley) but i have never have to generate sine wave.
So my Question is, it is possible to performs such Tests with a PLC only or do i Need an extra Signal Generator?June 17, 2020 at 12:44 pm #19469tfgmedia_admin
KeymasterHi there and welcome to the forums! Ah yes good old Bode, very useful to identify stability. A little off topic with what you’re trying to do, however, I did do a video where I created a “function generator” per say to generate a sine wave that is used DDE/OPC to populate an Excel spreadsheet in real-time from a logix controller. You can have a look at the video here:
June 18, 2020 at 2:29 am #19470ILC_H
ParticipantKarma: 15Rank: PadawanHi Fred , thanks for this Video, very useful and informative, although it doesn’t answer my Question. I will definetly need to configure an OPC communication for my Project.
The sine Generator is cool but can someone use it for frequency test? I mean is the PLC robust enough to generate high frequency sine wave ? (i.e Min. 500hz ). - AuthorPosts
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