Fanuc Robot System Variables Pdf Here
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 helpful guide to understanding and working with FANUC robot system variables, including how to find official PDF documentation. They are stored in the controller’s CMOS memory
1. Introduction
In the FANUC robotics ecosystem, the controller (e.g., R-30iB, R-30iB Mate, R-30iC) relies on a vast database of pre-defined variables known as System Variables. Unlike user-defined variables (Registers, Position Registers, etc.), system variables are intrinsic to the operating system. They allow programmers and technicians to monitor the robot's status in real-time, modify system behavior without changing core logic, and integrate external peripherals.
While often sought after in compiled PDF reference guides, these variables are dynamic entities best understood through their functional classification. This paper aims to demystify the standard variable naming conventions and provide a reference framework for implementation.
1. What Are FANUC System Variables?
System variables in FANUC robots (R-J3, R-30iA, R-30iB, R-30iB Plus controllers) are predefined variables that control or report robot status, such as:
- $MCR.$GENOVERRIDE – Overall speed override
- $SCR.$RMT_MASTER – Remote/Local setting
- $DMR_GRP[x].$MROT – Mastering rotation values
- $SV_OFF – Servo on/off status
- $ALARM_STR – Active alarm string
They are stored in the controller’s CMOS memory and are accessible in MENUS → System → Variables (or via KAREL programs, TP programs with =VAR syntax, or over Ethernet).
Versioning and compatibility notes
- Variable availability, names, and behavior vary by controller series (R-30iB, R-30iB Plus, R-30iA, R-30iB Mate, etc.) and firmware release.
- Always confirm the PDF matches your controller model and firmware version — the same variable name can behave differently or be absent across versions.
- Many PDFs include a “supported from firmware X.Y” note for each variable.
