Motion Control Technology block error

Hi Everyone,

I am using S71500 CPU 1510-sp1pn, with motion control technology block in my program. 

I have a analog signal with control the speed and position of the motor at the same time. I have scaled the analog signal and assigned that scaled value to the MC_movevelocity block, this way I am able to achieve what I want., 

The problem started when I was testing and after sometime an error occurred,

Error code is 550- "Drive-autonomous motion is being executed"

can someone please explain me in bit detail, what this error is and why did it occur. 

please note - While testing I was continuously changing the set-point in order to test it in worst conditions

In online mode the error details says "open position control"

Hello,

The technology objects speed axis, positioning axis and synchronous axis support the

"Safety Integrated Basic Functions" of the drive. The technology object detects that the Basic

Safety function is triggered and displays a corresponding warning (technology alarm 550 -

alarm response: Track setpoints) or alarm (technology alarm 421 - alarm response: Remove

enable).

3.2.5.5 Safety functions in the drive

https://support.industry.siemens.com/cs/ww/en/view/109749262