FANUC I/O Unit MODEL A Connection and Maintenance

Basic Information

Name: FANUC I/O Unit MODEL A CONNECTION AND MAINTENANCE MANUAL

Applicable equipment: FANUC I/O Unit MODEL A series I/O unit

Compatible with CNC: 0i, 15i, 16i, 18i, 30i/31i/32i/35i, Power Mate i, Power Motion i

Core purpose: To guide the installation, wiring, configuration, debugging, maintenance, and troubleshooting of I/O units

Document structure: Safety instructions → Connection section → Maintenance section → Appendix

Safety regulations (mandatory requirement)

Installation/wiring/maintenance must be powered off to prevent electric shock and equipment damage

It must be reliably grounded and follow the grounding standards of various countries

Do not plug or unplug modules or touch terminals while they are live, to prevent static electricity and high temperature burns

Overloading the output module can easily cause a fire, and an external fuse needs to be configured

Prohibited for use in personal safety related scenarios, external safety circuits must be configured

System architecture and communication

(1) Communication bus

I/O Link: Traditional bus, maximum 1024 DI/DO points per channel, 16 groups

I/O Link i: High speed bus, maximum 2048 DI/DO points per channel, 24 groups

Main station: CNC; Slave: I/O Unit MODEL A

Support long-distance transmission and anti-interference of fiber optic adapters

(2) System topology

1: 1: 1: n, n: 1, n: m flexible networking

Supports base expansion (I/O Link), I/O Link i does not support expansion

Up to 2 units per group (I/O Link), I/O Link i only has 1 unit per group

Hardware composition

Base unit

ABU05A/B: 5 slot horizontal/vertical

ABU10A/B: 10 slot horizontal/vertical

Interface module (core)

AIF01A/A2: Dedicated for I/O Link

AIF01D: I/O Link i Dedicated

AIF01E/E2: Dual protocol compatibility

AIF02C: Supports both Model A/B simultaneously

I/O module

Digital input/output: 16 point, 32 point, 24VDC

Analog input/output: 12 bit, 14 bit, 16 bit

High speed counting module: ACT01A

Temperature input module, relay output, AC output module

Installation specifications

Environmental requirements: 0~55 ℃, humidity ≤ 75%, dustproof and anti cooling liquid

Installation direction: Vertical installation is beneficial for heat dissipation, with a spacing of ≥ 100mm above and below

UL/CSA certification: Pollution level 2 environment, using AWG16 and above power cords

Heat dissipation: Natural convection is required for module heating, and placing heating devices below is prohibited

​Electrical connection (core engineering part)

(1) Power supply

Power supply: 24VDC ± 10%

Wiring sequence: First connect the CNC power supply, then connect the I/O unit power supply

Power calculation: Configure power capacity based on the total current of the module

(2) Grounding

Protective grounding: Base specific grounding terminal, wire diameter ≥ 2mm ²

Shielding grounding: Single ended grounding of analog/communication lines to suppress noise

(3) Communication cable

K1X/K2X: shielded twisted pair wire, maximum length 10m

Terminal resistance: The end of the group must be connected to TX terminal (A03B-0807-K806)

Fiber optic communication: used for long-distance and strong interference environments

(4) I/O wiring

Digital quantity: POS/NEG, distinguish common end

Analog quantity: voltage ± 10V, current ± 20mA, twisted pair shielded wire

Relay output: Inductive loads must be connected in parallel with freewheeling diodes/surge absorbers

Module specification details

(1) Digital input module

Voltage: 24VDC, response time 2ms/20ms

Type: Isolated/Non Isolated, Common Anode/Common Cathode

Features: AID16DM/LM with common terminal voltage monitoring and abnormal alarm

(2) Digital output module

Type: transistor, relay, AC thyristor

Protection: overcurrent, over temperature, short circuit protection, alarm LED indication

Specification: 0.3A~2A/point, with reduced capacity curve

(3) Analog module

AAD04A: 12 bits, 4 channels, ± 10V/± 20mA

AAD04B/B2:16 bit high-precision, high-speed sampling

ADA02A/B: 12/14 bit output, ± 10V~0~20mA

(4) High speed counting module (ACT01A)

Count: 1 channel, up to 500kHz

Mode: A/B phase, positive and negative pulse modes

Function: Compare output, tag synchronization, external start stop, alarm diagnosis

Address allocation rules

I/O points are occupied in segments of 32/64/128/256 points

Maximum per group: I/O Link=256 points; I/O Link i=512 points

The analog/high-speed counting module occupies a fixed byte address

Special modules (monitoring/protection) occupy additional DI/DO addresses

Maintenance and fault diagnosis

(1) Status indicator light

PWR: Power supply is normal

LNK: Communication is normal

ER/ALM: Fault alarm

Module LED: Channel status, alarm indication

(2) Troubleshooting

Communication failure: Check the terminal, cable, station number, and baud rate

Output fault: Check load, fuse, protection action

Analog fault: Check wiring, shielding, grounding, and range

Counting fault: Check the encoder type, phase, and wiring

(3) Daily maintenance

Regularly clean dust and coolant

Check terminal fastening and cable damage

Regular replacement of fuses, relays, and filters