Hello everybody, 

I have this configuration: PLC:1512SP-1 PN , Absolute Encoder PROFIDRIVE, Drive G120C.

I want to make the Homing , in this: way:

Press a button on the HMI then, the Axis goes to the direction of the Digital Input(negative , in my case)  and , When I will get the sensor,  that will be my " zero". 

At the moment, I'm just able to move by my self the Axis, then , when I arrive to the sensor, I press a button and make MC_HOME_Instance_Execute in the PLC (in the MC_Home mode I have setted 7) , so in this way I have my Origin. But, How can I make in the way that I want?

Thanks in advance

if I got you correctly. While "Homing" you don't want to move Axis manually to the place when so-called "home pos.sensor" in fact proximity sensor meets its plate.

As far as I remember, any known drive allows moving (when it is not referenced) in jogging mode.

So, check your drive for that.

BR

Hello,

Principle of operation

The axis is traversed in the setup mode to the starting position. The referencing sequence is then started. The axis traverses in a positive direction. If the reference cam responds or the fixed stop is detected, the actual position is saved. The axis is then stopped. The "Absolute encoder offset" is now calculated from the defined position of the reference cam (reference position) and the saved position (measured value) and the absolute encoder adjustment is executed.

"Absolute encoder offset" = reference position - measured value

The MC_MoveVelocity (position-controlled) is used for the procedure. If the reference point has been detected, the system is stopped using MC_Haltl. The absolute encoder offset is then calculated and the absolute encoder adjustment is carried out using MC_Home.

The absolute encoder adjustment is executed in relative terms to allow an existing offset to be taken into account. To do this, the mode = 6 is used for the MC_Homing command.

Absolute encoder adjustment (relative)

The current position is offset by the value of the "Position" parameter.

The calculated absolute value offset is retentively saved in the CPU.

(<TO>.StatusSensor[1..4].AbsEncoderOffset)

A detailed description of the commands can be found in the following documentation.

SIMATIC S7-1500 S7-1500/S7-1500T axis functions

https://support.industry.siemens.com/cs/de/de/view/109781849