HandlingTool Programming: Motion Instructions, Registers, and I/O

HandlingTool Programming: Motion Instructions, Registers, and I/O

Why This Lesson Matters

A FANUC HandlingTool program is the core language you use to move a robot through a pick-and-place cycle, control tooling such as a gripper, and respond to sensor signals from the production line. Mastering motion instructions, registers, and I/O commands prepares you for the FANUC CERT technician-level performance exam and for real manufacturing cells where a programming error can damage tooling or injure workers.

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Safety Before You Touch the Pendant

Before entering the robot cell, review these rules every session.

• Lockout/tagout (LOTO): When teaching positions or performing maintenance, follow OSHA 29 CFR 1910.147. Verify the cell is in a safe energy state before reaching inside the work envelope. Never bypass interlocks.
• Machine guarding: OSHA 1910.212 and ANSI/RIA R15.06 (ISO 10218) require that safeguards — light curtains, safety gates, and area scanners — remain active during automatic operation. Do not defeat them.
• Teach mode: When jogging or teaching positions, the pendant deadman switch must be held in the center position. Releasing it or pressing it fully stops motion immediately.
• Speed limits: Jog speed must stay at or below 250 mm/s (roughly 10 in/s) when personnel are inside the cell, per ANSI/RIA R15.06 guidelines.
• PPE: Safety glasses are required at all times in the lab. No loose sleeves or jewelry near moving axes.

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Motion Instructions: JOINT and LINEAR

HandlingTool uses two primary motion types.

JOINT motion moves each axis independently toward the target position. The path through space is not a straight line, but JOINT is fast and efficient. Use it for moves where the exact path between two points does not matter — for example, moving from home to an approach point above a part bin.

LINEAR motion drives the TCP (tool center point) along a straight line in Cartesian space. Use it whenever the path matters — lowering straight down onto a part, lifting it straight up, or moving horizontally to a place point to avoid fixtures. LINEAR motion requires the controller to coordinate all axes simultaneously, so it is slightly slower than JOINT for the same distance.

A typical HandlingTool instruction line looks like this:

```

1: J P[1] 100% FINE

2: J P[2] 80% CNT50

3: L P[3] 200mm/sec FINE

4: L P[4] 200mm/sec CNT10

```

• J = JOINT, L = LINEAR
• P[n] = the stored position register
• The speed value uses percent of max for JOINT and mm/sec (or in/sec) for LINEAR
• FINE means the robot decelerates fully and stops exactly at the taught point before continuing — required at pick and place
• CNT (Continuous) means the robot blends through the point without stopping; CNT100 is the smoothest blend, CNT0 is nearly like FINE. Use CNT for via points where precision is not needed

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Position Registers and Numeric Registers

Position registers (PR[n]) store a full Cartesian or joint-angle location. They can be taught from the pendant or entered as offsets, and they can be modified in the program with offset instructions. Use them when you need to compute pick positions mathematically (for example, a pallet pattern).

Numeric registers (R[n]) hold integer or real number values. Common uses include part counters, loop counts, and scaling values. You read and write them with assignment statements:

```

R[1]=R[1]+1

```

This line increments register 1 by 1 each time the controller executes it. Place this line after a successful pick to count completed cycles.

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Digital I/O Commands

Digital outputs (DO[n]) command external devices such as grippers, clamps, and indicator lights. Digital inputs (DI[n]) read sensor states — part-present switches, conveyor signals, and safety interlocks.

To activate a gripper at the pick point:

```

DO[1]=ON

```

To release it at the place point:

```

DO[1]=OFF

```

Always confirm your I/O wiring diagram before assigning DO and DI numbers. Assigning the wrong output number can energize unintended tooling.

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Conditional Jump: Handling Part-Absent Faults

A robust program must handle sensor failures gracefully. The IF … JMP LBL instruction checks a condition and redirects program flow if that condition is true.

```

IF DI[1]=OFF, JMP LBL[10]

```

If the part-present sensor (DI[1]) is OFF when the robot reaches the pick point, execution jumps to label 10 instead of continuing the grip sequence. At label 10 you place an alarm routine — typically a PAUSE instruction and a user alarm message — so the operator can investigate before the robot cycles again.

Program flow for this lesson's pick-and-place cycle:

1. J P[1] home — FINE

2. J P[2] approach — CNT50

3. L P[3] pick — FINE

4. Check sensor: IF DI[1]=OFF, JMP LBL[10]

5. DO[1]=ON (close gripper)

6. L P[2] retract — FINE

7. J P[4] place approach — CNT50

8. L P[5] place — FINE

9. DO[1]=OFF (open gripper)

10. R[1]=R[1]+1 (increment counter)

11. J P[1] return home — FINE

12. LBL[10]: PAUSE (alarm routine)

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Reading the I/O Status Screen

During testing, press MENUS > I/O > Digital on the pendant to watch DI and DO states update in real time. This is the fastest way to verify that a jumper wire is toggling DI[1] as expected and that DO[1] changes state when the gripper instruction executes. Document each state transition in your lab log: record the instruction line number, the I/O signal, the state before and after, and whether the program branched correctly.

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Connecting to FANUC CERT

The FANUC CERT technician-level exams (FCR-T1, FCR-T2) include both a written test and a hands-on performance test covering exactly these skills: program creation, position teaching, motion-type selection, register use, and I/O programming. Accurate, repeatable motion and correct conditional logic are the benchmarks evaluators check.