# STEP - contact change

**URL:** https://prepomax.discourse.group/t/step-contact-change/1568
**Category:** General Questions
**Created:** [February 28, 2024, 10:30am UTC](https://prepomax.discourse.group/t/step-contact-change/1568 "2024-02-28T10:30:49Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![ViV](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/viv/32/3262_2.png) [@ViV](https://prepomax.discourse.group/u/ViV)
#### Post date: [February 28, 2024, 10:30am UTC](https://prepomax.discourse.group/t/step-contact-change/1568/1 "2024-02-28T10:30:49Z")

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Hi PPM community,

Is it possible to deactivate, activate or change contact parameters through several STEPs?  
Thank in advance for your reply.

greetings  
ViV

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<div class="post-metadata">

### Author: ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)
#### Post date: [February 28, 2024, 10:35am UTC](https://prepomax.discourse.group/t/step-contact-change/1568/2 "2024-02-28T10:35:10Z")

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Yes, but it’s not yet implemented in PrePoMax. You can use the keyword editor for that and add the following card:

```auto
*MODEL CHANGE, TYPE=CONTACT PAIR, ADD/REMOVE
slave_surface_name, master_surface_name

```

Of course, you have to choose either `ADD` or `REMOVE` in a given step.

You can also change friction:

```auto
*CHANGE FRICTION, INTERACTION=surface_interaction_name
*FRICTION
friction_coefficient, stick_slope

```

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<div class="post-metadata">

### Author: ![ViV](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/viv/32/3262_2.png) [@ViV](https://prepomax.discourse.group/u/ViV)
#### Post date: [February 28, 2024, 10:54am UTC](https://prepomax.discourse.group/t/step-contact-change/1568/3 "2024-02-28T10:54:15Z")

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O.K… Great.  
Thanks for the reply.