Fanuc Parameter Write Switch

Fanuc Parameter Write Switch

Category : Fanuc

Messing With Parameters Can Be Fatal!!!!!

To change parameters you need to go to the setting screen in MDI. Now put a 1 in the parameter write box.

Some more interesting parameters

3203 Clear MDI Screen

3401 Calculator Type Decimal Point or Integer

3402 G Codes that are Active When The machine is Turned On

6005 Allows the Use of Local Subroutines (Newer Control)

6050-6059  Allows you to Call a 9000 series Program with a G Code

6080-6089 Allows you to Call a 9000 series Program with An M Code

5003 Retain Geometry when you Press Reset


Oh just one other thing before you go off and cripple your machine forever.

Do yourself a favor take a picture of the screen before you change a parameter. If you aint got a camera then you must have a piece of paper.

Even better back everything up.


If you have been affected by any of the issues in this post or need CNC Counselling then contact me.

If you want to learn to program CNC Milling Machines

Look no further Contact CNC Training Centre

1 Comment

Pascal Siegwart

October 2, 2020 at 9:52 am

Hi David, my Name is Pascal and i live in Germany. So.. i have a big Problem with an Fanuc 32iB.

How can i fix the issue “PS5541 Basic Software illegal”.
The old Control Unit doesnt work anymore ,so i copied everything on a new control unit with the same options an reinstalled in the machine.
Is there a Parameter a have to set??

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