Often tied to enabling custom macro variables and logic. 9937
To successfully modify a 9900-series parameter, use the following standardized procedure on your FANUC control panel: Step 1: Enable Parameter Writing Press the function key. Press the [SETTING] softkey. Move the cursor to PARAMETER WRITE .
Unlike standard system parameters, 9900 series parameters (and their predecessors, the 900 series) are often protected or hidden to prevent unauthorized activation of paid features. fanuc 9900 parameter list
Certain 9900-series parameters are locked by FANUC or the Original Equipment Manufacturer (OEM) and require specific access levels. 1. Overview of FANUC 9900 Parameters
Controls whether Profibus, DeviceNet, EtherCAT, or Fanuc I/O Link i is active. Often tied to enabling custom macro variables and logic
Increasing the maximum number of registerable programs (e.g., expanding from 400 to 1000 programs). 3. High-Speed Machining & Look-Ahead
In MDI mode, with PWE=1, typing parameters 9900–9999 often shows “****” or “0”. To view: Move the cursor to PARAMETER WRITE
In this post, we break down what the 9900 parameters are, why they matter, and why you should approach them with extreme caution.
Many builders (like Mazak, Doosan, Haas, or Mori Seiki) use these macro parameters to execute complex tool changes. Changing one of these parameters might cause the tool changer arm to crash into the spindle.
If you are trying to resolve a specific machine behavior or error code, tell me: