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This guide outlines how to access, use, and document FANUC robot system variables, which are critical for configuring controller behavior and speeding up programming. 1. Understanding FANUC System Variables

System variables store internal controller information and can hold data types such as integers, strings, booleans, and real values.

Variable Types: While most are internal or read-only (RO) for safety, many can be modified to customize operation. Key Categories:

Configuration: Interface settings like Allen-Bradley links ($AB_INT_CFG). fanuc robot system variables pdf

Motion Control: Acceleration limits ($ACC_MAXLMT) and axis error tolerances ($ANGTOL).

I/O & Automation: Auto-assignment of UOP ($IO_AUTO_UOP) and override signals in AUTO mode ($AUTOMODE_OV). 2. How to Access Variables on the Controller

To view or edit these variables on a standard R-30iA or R-30iB controller: Press the MENU key on the Teach Pendant. Select SYSTEM (0) from the menu. Press F1 [TYPE] and select Variables. This guide outlines how to access, use, and

Use the cursor to scroll through the alphabetical list. Press ENTER on a variable (e.g., $SCR_GRP) to view its sub-elements. 3. Essential System Variables for Reference Variable Name Recommended Use $SCR_GRP[1].$HBK_ENBL Hand Broken Detection Enable/disable the safety stop for broken tool signals. $ER_AUTO_ENB Auto Alarm Display Automatically show the alarm menu when a fault occurs. $GENOVRD_DO Override Signal Outputs a signal when the speed override is at 100%. $REMOTE_CFG Remote/Local Setup

Configures how the robot switches between remote and local control. 4. Safety & Documentation Best Practices

Here’s a strong, solid feature set you could include in a “FANUC Robot System Variables PDF” — whether you’re creating one, evaluating one, or requesting one from FANUC or a training provider. Final Recommendation If you need the official FANUC

Final Recommendation

If you need the official FANUC system variables PDF, contact FANUC technical support or your local distributor with your controller model (e.g., R-30iB Plus, software version 9.xx). They can email you the correct manual number and download link.

Would you like a list of specific variable names for a common task (e.g., I/O mapping, mastering, or speed control)?

Here’s a helpful review of a typical FANUC Robot System Variables PDF (assuming you’re referring to the official FANUC documentation, e.g., the FANUC Robot Series R-30iB/R-30iB Mate Controller System Variables Manual or similar):

4. Variable Change Procedures

Step-by-step: how to view/modify variables from teach pendant (MENU → System → Variables)
Instructions for Controlled Start access
How to set variables via .TP or .LS programs (e.g., R[1]=$MCR.$GENOVERRIDE)

Step 1: Backup, Backup, Backup

Before changing any system variable, perform an Image Backup or an All of Above backup to a USB drive. This allows you to reload the previous configuration instantly.

3. Browsing System Variables Without a PDF

On the teach pendant:

Press MENU → NEXT → SYSTEM → Variables
Use TYPE to filter by category (e.g., $SCR, $MCR, $DMR_GRP)
Press DETAIL to see description (if available – many are cryptic)

10. Quick Reference Card / Summary Tables

Top 20 most useful system variables for programmers
Variables to never touch unless absolutely sure