FANUC I/O Unit A Maintenance Manual

Insulated transistor output:

AOD08C (NEG, 2A/point, with fuse 5A/common)

AOD08D (POS, 2A/point, with fuse)

AOD08DP (POS, 2A, with overcurrent/overheat protection, LED "F" lights up in case of abnormality, and corresponding DI bit is 1)

AOD16C/D (NEG/POS, 0.5A/point)

AOD16DM/DN (POS, 0.5A, with output protection and diagnostic functions, requiring additional input bytes to transmit alarms under I/O Link)

AOD16D2/D3 (POS, 2A/point, HIROSE 40 pin or Weidm ü ller terminal block, built-in fuse)

AOD32C1/C2（NEG，0.3A）、AOD32D1/D2（POS，0.3A）

Communication output: AOA05E (5 points, 2A/point, 100-230VAC), AOA08E (8 points, 1A), AOA12F (12 points, 0.5A, only 100-115VAC). Each output point or common terminal is equipped with a 3.15A fuse.

Relay output: AOR08G (8-point, 4A/point, shared 1 common terminal), AOR16G (16 point, 2A/point, 4-point/common), AOR16H2 (16 point, 2A DC, HIROSE 50 pin). The mechanical lifespan of the relay is 20 million cycles, and the electrical lifespan is 100000 cycles (for resistive loads). It is strictly prohibited to use it for frequent switching or large inductive loads, and an external surge suppressor must be connected.

Precautions for output protection:

For AOD08DP, AOD16DP, and AOD16DM/DN, when overheating or overcurrent occurs, the protection circuit will turn off the corresponding point output and automatically restore it after the temperature drops. But if the fault is not resolved, it will repeatedly turn on and off. At this time, the LED "F" is constantly on, and abnormal points can be read through the DI area (such as AOD16DM occupying an additional 4 input bytes).

Suggest monitoring the alarm position in the ladder diagram and promptly cutting off the output command.

3.3 Hybrid module AIO40A

24 point input (bidirectional, 24VDC, 20ms)+16 point output (NEG, 0.2A/point, 2A/common). The input and output share Honda 50 pin connectors. Attention should be paid to output current derating: When the current at each point is greater than 0.1A, the number of conductive points should not exceed 3 at the same time.

Analog module configuration and engineering application

4.1 Analog Input Module

AAD04A (12 bits): ± 10V or ± 20mA, corresponding to digital quantity -2000~+2000 (complement of 2), resolution 5mV/20 μ A, accuracy ± 0.5% (voltage) ± 1% (current), conversion time ≤ 2ms. Each channel can choose voltage or current input (current input is achieved by short circuiting I+and V+).

AAD04B (16 bits): ± 10V/± 20mA, corresponding to a digital quantity of -32000~+32000, with a resolution of 0.3125mV/1.25 μ A. The accuracy is the same.

AAD04B2 (16 bit high-speed type): Similar to AAD04B, but with an input filter delay of only 2ms (cutoff frequency of 500Hz), suitable for rapidly changing signals.

Address mapping: 4 channels occupy 8 input bytes (X0~X7). In PMC, it needs to be read in units of words (16 bits). For old models such as PMC-N/NA/QA, special attention should be paid to high and low byte swapping.

Wiring points:

Use shielded twisted pair cables, with the shielding layer grounded at one end (or both ends grounded/ungrounded depending on the environment).

When inputting voltage, connect Vn+to the positive signal, and connect Vn - and COMn to the signal reference ground together; When inputting current, connect In+to positive and short-circuit Vn+to In+and Vn - to COMn.

4.2 Analog output module

ADA02A (12 digits): ± 10V or 0-20mA, digital quantity -2000~+2000 corresponds to -10~+10V or 0-20mA.

ADA02B (14 bits): ± 10V or 0-20mA, digital quantity -8000~+8000 corresponds to -10~+10V, resolution 1.25mV/2.5 μ A.

The output wiring uses shielded twisted pair cables, and the shielding layer is grounded at a single point at the load end. Output type selected through terminals: voltage output connected to V+, V -; The current output is connected to I+and I -, and must be connected to a load resistor (voltage load ≥ 10k Ω, current load ≤ 400 Ω).

Safety reminder: I/O Unit-A must be powered on before supplying power to external loads. Otherwise, it may cause unexpected output misoperation.

Special function module

5.1 High speed counter module ACT01A

Specially designed for connecting differential line drive (RS-422) encoders, with a maximum frequency of 125kHz (A/B phase) or 500kHz (positive and negative pulses). The counter is 23 bits (0~8388607). Supports two working modes:

Mode A: 3 comparison registers (A, B, C), the comparison results output 3 SSR signals (CMPA~CMPC), occupying 4 input+4 output bytes.

Mode B: 16 comparison registers (# 0~# 15), with a comparison result output of 8 bits (OUT0~OUT7), occupying 8 inputs+4 output bytes (switching modes by writing control words).

Encoder wiring: Signal names PAS/PAS (A-phase), PBS/PBS (B-phase), MKS/* MKS (marked). If using positive and negative pulse mode, connect the PSEL pin to 0V.

Common faults:

Wire breakage alarm (ALM LED): Check the encoder cable and grounding. If there is no marked signal, the MKS/* MKS pin needs to be short circuited to GND and connected to+5V. Manual recommendation: When not in use, connect the * MKS to 0V and leave it suspended? Actually, it should be handled according to section 8.2.6- if no marking is used, connect both MKS and * MKS to LGND (0V).