# Why are there so many similar FC instructions?

**URL:** <https://tech-community.robotics.abb.com/t/why-are-there-so-many-similar-fc-instructions/11455>\
**Category:** RAPID Programming\
**Created:** [May 27, 2024, 8:13am UTC](https://tech-community.robotics.abb.com/t/why-are-there-so-many-similar-fc-instructions/11455 "2024-05-27T08:13:22Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![jaakko](https://avatars.discourse-cdn.com/v4/letter/j/a9adbd/32.png) [@jaakko](https://tech-community.robotics.abb.com/u/jaakko)\
**Post date:** [May 27, 2024, 8:13am UTC](https://tech-community.robotics.abb.com/t/why-are-there-so-many-similar-fc-instructions/11455/1 "2024-05-27T08:13:22Z")

</div>

In FC manual: [https://library.e.abb.com/public/bde123851c3c419580ee0512a055df98/3HAC050377%20AM%20Force%20Control%20RW%206-en.pdf](https://library.e.abb.com/public/bde123851c3c419580ee0512a055df98/3HAC050377%20AM%20Force%20Control%20RW%206-en.pdf)  
There are four FC instructions  
FCPress1LStart  
FCPressL  
FCPressC  
FCPressEnd

In RobotStudio, there are additionally  
FCPress1L  
FCPress1C  
FCPressLEnd

I see FCMACHINING module in the controller view. Is there any documentation to these three commands that are not included in the manual?