These “pro-level” macro techniques are not secret in the sense of undocumented—most are officially supported on Fanuc Macro B–equipped controls—but they are rarely used correctly and can dramatically reduce crashes, scrap, and setup errors. Availability depends on control model and options (Macro B, custom macro, etc.). Always test in graphics/simulation and verify on your specific machine.

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1) Why Pros Use Macro Alarms and Prompts

In real production, the most expensive problems aren’t bad toolpaths—they’re preventable human mistakes: wrong work offset, wrong tool loaded, wrong jaw orientation, wrong spindle direction, forgetting to clamp, probing skipped, or running the wrong revision. Macro-driven guards can stop the machine before damage happens and document what went wrong.

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2) The Two Most Powerful Fanuc “Control Flow” Variables

A) #3000 — Raise a Hard Alarm (Emergency Stop Style)

• Immediately stops the program and throws an alarm.
• Use it when continuing is dangerous (wrong offset, door open interlock scenario, probe fail, tool missing).

Pattern
IF[ condition ] THEN #3000 = alarm_number

Real examples
(1) Block running if G54 isn’t active (work offset mismatch)
IF[#4003 NE 54] THEN #3000=101 (EXPECTED G54 ACTIVE)

(2) Prevent cutting with spindle stopped
IF[#4009 EQ 0] THEN #3000=102 (SPINDLE SPEED ZERO)

(3) Prevent feeding if coolant is OFF (example M-coolant state may vary by builder)
(Builder-dependent; replace with your machine’s coolant status variable if available)
(If unknown, remove this guard)
( IF[ coolant_off_condition ] THEN #3000=103 )

Notes: #4003, #4009 are commonly used modal/system variables on many Fanuc controls, but exact meanings can vary. Keep the concept; confirm your control’s variable list.

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B) #3006 — Display a Message (Soft Stop / Operator Prompt)

• Displays a message to the operator (often with a stop depending on parameter).
• Use it for setup confirmations, inspection prompts, and “do not proceed” warnings without a full alarm.

Pattern

3006 = 1 (MESSAGE TEXT…)

Real examples
(1) Mandatory inspection after roughing

3006=1 (MEASURE BORE DIA AND ENTER OFFSET IF NEEDED)

(2) Confirm fixture orientation before continuing

3006=1 (VERIFY VISE JAWS ORIENTATION: SOFT JAWS REV B)

(3) Remind to enable probing stylus or air blast

3006=1 (TURN ON AIR BLAST FOR CHIP CLEARING)

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3) Crash-Proof Guard Blocks You Can Reuse in Every Program

Guard A: Safe Z Before Any XY Rapid

This is a simple “pattern” that prevents most vise/fixture crashes.

• Make Z safe first, then move XY.

Example header:
G90 G17 G40 G80
G00 Z100. (SAFE Z)
G00 X… Y…

If you want it more strict with a macro check:
(If current Z is below a safe plane, force retract)
IF[#5023 LT 50.] THEN G00 Z100.

5023 is commonly current Z position in the active coordinate system on many Fanuc setups, but confirm your control. The idea: if Z is low, retract before XY.

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Guard B: Force Correct Feed Mode Before Cutting

Wrong feed mode can destroy parts quickly (especially if a program accidentally leaves G93 inverse-time active).
IF[#4001 EQ 93] THEN #3000=111 (G93 ACTIVE – SWITCH TO G94)

Then explicitly set:
G94

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Guard C: Confirm Tool and Offset Match (Cheap but Effective)

If your shop rule is “T number must match H/D number”, enforce it.
Example:
(Assume current tool number in #4120 on many Fanuc controls—confirm)
IF[#4120 NE 12] THEN #3000=121 (EXPECTED TOOL T12)
G43 H12
G41 D12

This prevents “wrong tool loaded, correct program running” disasters.

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4) Professional Macro Example: “Smart Start” Template

A reusable macro-style start section that blocks the most common catastrophic mistakes.

(— SMART START —)
G90 G17 G40 G80
G94
G00 Z100.

(Require correct work offset)
IF[#4003 NE 54] THEN #3000=201 (ACTIVATE G54 BEFORE START)

(Require spindle command not zero before any feed move)
IF[#4009 EQ 0] THEN #3006=1 (SET SPINDLE SPEED Sxxxx THEN CYCLE START)

(Operator confirmation)

3006=1 (CONFIRM: PART CLAMPED, VISE TIGHT, DOOR CLEAR)

(— END SMART START —)

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5) Pro Tip: “Soft Stop” vs “Hard Stop” Strategy

Use #3006 for workflow guidance (inspection, reminders, confirmations).
Use #3000 for safety-critical conditions where continuing can crash, scrap, or injure.

A good rule:

• If a human can fix it quickly → #3006
• If the machine must not move until corrected → #3000

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6) High-Impact Use Cases That Drive Real Results

• Prevent running wrong offset (G54 vs G55) on multi-vise fixtures
• Prevent G93 inverse-time feed from leaking into normal milling
• Force safe Z before XY reposition (vise crash prevention)
• Enforce tool/offset pairing rules (T/H/D consistency)
• Standardize in-process inspection prompts for critical dimensions
• Stop on probing failure conditions (builder/probe-macro dependent)

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7) Summary

These Macro B patterns (#3000 alarms, #3006 prompts, and simple modal guards) are “professional-grade” because they make programs self-defending. They reduce preventable crashes, speed up setups, and create consistent shop standards. They aren’t magic or undocumented—just underused—and they scale beautifully across an entire CNC program library.

If you want, I can continue with the next “pro-only” topic in the same format: a clean, reusable macro library for (1) automatic revision checks, (2) probing-result validation, and (3) adaptive wear-offset nudging—without relying on brand-specific probing packages.