Controlling Siemens variable frequency drive

Hello guys,
by examining one STEP 7 program that is used for controlling VFD micromaster drive I came accross one part which is particulary interesting to me.

I need someone more experienced to explain me what is happening. If I understand correctly, something like this is happening.

Setpoint that is read from some other location and which is in % (0-100%) is converted to number between 0 and 16384 and send to drive.
This opens two types of questions:
1. Why number 16384 is used? Is it standard for all Siemens' drives?
2. What exactly is a control word? Is it standardised, or a programmer is defining it according his particular needs?

Looking forward to your answers...

Which Siemens drive is this, MM4..6ES70 or ?
This may help on some explanations

I think it is MM440, but not really sure, I'll need to check this...

Here is the control word, you will notice the 16 bits for each control function.



In my experience this is very similar to all drives that support a PPO profile for profibus too. As far as the 16 bits for speed reference, it is 32767, the MSB bit is used for a sign (FORWARD OR REVERSE)
Try to send the drive -16383 and you will see the drive reverse directions.
The Masterdrive can support 32 bits (thats why I asked the question regarding the exact drive, the phase Micromaster should have been a clue for me )

Controlword

Hi Pandiani

I think it is 0-4000 HEX. It is on Danfoss.
ControlWord is 16 bit for control the drive eg. start,stop, rev,
ect.
I have not been working with Siemens, but i think Danfoss and Siemens works more and less the same.

Banker

BTW. I will try the filter you have made next week look very good.