6/8/2013 7:42 PM | |
Joined: 9/27/2006 Last visit: 5/6/2024 Posts: 12257 Rating: (2666) |
Hello Ugljesa; Using a PID controller with a Micromaster drive as a final control element of a loop is quite easy to do, especially if you are familiar with how to send a speed reference to the drive. So, how familiar are you with Profibus-DP control of a MM4 drive? The basic idea is to use the standard PID function blocks of the S7 CPU to setyour requiredsetpoint, read in the process variable, compare thetwo and determine how far away the process is from the desired setpoint. This PID calculation will generate a control output that can be sent to the final control element. If this is an MM4 using Profibus, you must adapt the command signal to the range that the drive understands, and write that to the Profibus registers in the PLC. So, let's start with the S7 PID blocks. Start by looking at the samples and examples provided by members Aret and Hamid Hosseini in the following thread: PID in S7-300 How can you improve the control quality of controllers through empirical optimization? |
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