How to regulate speed in plcs

Can any one help me on how to regulate speed in plcs programmes.

How to regulate speed in plcs
Can any one help me on how to regulate speed in plcs programmes

Depends on the program and how it is written. Programs are not cookie cutter.

Post the program if you can and maybe someone will take a look.

Your other thread referred to controlling the speed of a motor using a PLC. I assume this is the same question.

Most PLCs do not directly control the speed of a motor. There must be hardware which performs that function. The PLC by various means can direct the controlling hardware as far as speed or other control parameters.

As requested in the other thread we must know the type of motor, the type of motor controlling hardware and the type of PLC. How is the PLC connected to the controlling hardware - if it is at all?

Is it on a motor, what is being driven? There are many details that need to be given before help can be forth coming.

School alert.


If it is like Bernie says varying the speed of a motor. I use change the value going out to the drive.
If is it like it reads that an infinite loop will vary the PLC program.

I know I know Shhhhhhhhhhhhhh!

An analog output tied to an vfd with a matching input and a PID maybe? What would the motor be running? Pump? Convey belt?