S110 Speed control via TIA V14 (+SCL)

Hello,

I don't know what is going wrong in your project. I can just try to give you an idea to create a simple control: I would try to run the speed axis with the SINA_SPEED FB from the new DriveLib. You can download the lib here:

https://support.industry.siemens.com/cs/de/en/view/109475044

Attached you find some screenshots of my little example project.

This should make it much more easy. Only thing you need to know: Standard telegram 1 is used for this FB.

For sending other values from the drive to the PLC you could add an supplementary data telegram to your drive. TIA Portal offers a supplementary telegram 2/6 for example, which means you can send 6 words from the drive to the PLC. So in STARTER you also add this telegram. There input and output direction is the other way round, so you select supplementary data 6/2 there. Then you can connect for example r81 to the free PZD 3+4 in transmit direction. This parameter is Float32 and given directly in %. You need to know that 100% in your PLC are 4000 0000hex for 32 bit float values. The temperature is also in %, but refers to the value in p2006. So if p2006 = 100° and r37 = 45°, your drive sends 45% to the PLC and there you need to convert the value to 4000 0000hex. You can find the information of the reference value in the online help of all parameters.

In the PLC you can read out this supplementary data for example with the DPRD_DAT function.  

Hi again,

you need to know that the PLC can only interprete float values from the telegram between -2.000 (means -200%) and +1.999 (means 199.9%). So the drive cannot send a float value like 45,3 for 45,3°C. So these kind of parameters have a scaling parameter. The scaling parameters are starting at parameter number 2000. There are scalings for speed, voltage, torque values etc. So each connectable float parameter is scaled to any of these scaling parameters. The datatype of each parameter and the scaling parameter can be found in the help of the parameter itself.

This is also the reason why you need to adjust the reference speed at the SINA_SPEED FB input. Otherwise the FB cannot calculate the correct percentage value for your velocity setpoint. You need to write the same value to this input like parameter p2000 in your drive. Otherwise 100.0rpm velocity are maybe not 100.0rpm in the drive. Because the PLC just sends the percentage override value to the drive and the drive multiplies this value by p2000.

For r35 the scaling parameter is p2006. For example p2006 = 200.0° and r35 = 50.0°. Then the drive will not send the value 50.0 to the PLC. It will send 50.0/200.0 = 0.25 to the PLC. 

The interpretation in the PLC is as follows:

For 32 bit float values 100.0% is 4000 0000hex. 199.9% is 7FFF FFFFhex. -200.0% is FFFF FFFFhex.

For 16 bit float values 100.0% is 4000hex and so on.

All Integer (8, 16, 32 bit) values are directly send and received without any conversion or scaling.