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- Allen Bradley
- 1769-IA8I
- CompactLogix I/O Module
- USA
- 118 mm × 35 mm × 87 mm
- 0.32kg
- Xiamen, China
- New & In Stock
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Technical Report: 1769-IA8I Individually Isolated 120V AC Digital Input Module
1. Product Overview
The 1769-IA8I is a Compact I/O 8-point AC digital input module designed for industrial automation systems that require reliable high-voltage AC signal acquisition with individual channel isolation.
Each input channel is electrically isolated, allowing safer operation in environments with electrical noise, ground potential differences, and complex wiring layouts. The module is commonly used in CompactLogix and related PLC-based control systems.
It converts 120V AC field signals into digital signals readable by the PLC backplane system.
2. Brand and Series Information
Brand: Industrial automation control platform ecosystem
Series: 1769 Compact I/O Series
Product Family: AC Digital Input Modules
Module Type: 8-Point Individually Isolated 120V AC Input Module
3. Product Function Description
The 1769-IA8I is responsible for monitoring AC field devices and converting their ON/OFF status into PLC-readable data.
Core functions include:
- Reading 8 independent 120V AC input signals
- Providing individual channel electrical isolation
- Converting AC field signals into digital PLC data
- Filtering electrical noise for stable signal detection
- Supporting distributed and modular I/O system design
- Ensuring safe interface between field wiring and PLC backplane
It is typically used in systems where AC control circuits are standard in industrial wiring.
4. Technical Parameters
Electrical Specifications
| Parameter | Value |
|---|---|
| Number of Inputs | 8 individually isolated channels |
| Input Voltage Range | 79–132V AC |
| Frequency Range | 47–63 Hz |
| On-state Current | 5–12 mA |
| Maximum OFF-state Voltage | 20V AC |
| Inrush Current | Up to 250 mA |
| Backplane Current Draw | ~90 mA @ 5V DC |
| Power Dissipation | ~1.81 W |
Isolation & Protection
| Parameter | Value |
|---|---|
| Input Isolation | 1517V AC / 2145V DC (1s) |
| Isolation Type | Point-to-bus & group-to-group |
| Insulation Standard | IEC reinforced insulation class |
| Protection Function | Electrical noise suppression |
Mechanical Specifications
| Parameter | Value |
|---|---|
| Dimensions (H × W × D) | 118 mm × 35 mm × 87 mm |
| Height with Tabs | 138 mm |
| Weight | ~0.27 kg – 0.32 kg |
| Mounting Type | DIN rail / panel mount |
| Slot Width | 1 slot |
| Wiring Type | Removable terminal block |
Environmental Specifications
| Parameter | Value |
|---|---|
| Operating Temperature | 0°C to 60°C |
| Storage Temperature | -40°C to 85°C |
| Humidity | 5% – 95% non-condensing |
| Vibration Resistance | Industrial IEC standard |
| Shock Resistance | Up to 15G |
| EMC Performance | Industrial environment rated |
5. Product Advantages
1. Individual Channel Isolation
Each input channel is electrically isolated, reducing risk of interference between signals.
2. Strong Noise Immunity
Suitable for harsh industrial environments with high electrical noise and long cable runs.
3. High Reliability AC Detection
Designed specifically for 120V AC signals with stable ON/OFF recognition.
4. Compact High-Density Design
8 isolated inputs in a single module reduce cabinet space usage.
5. Safe Field-to-PLC Interface
Protects PLC backplane from field-side electrical faults.
6. Easy Maintenance Structure
Removable terminal blocks simplify wiring replacement and troubleshooting.
6. Application Areas
The 1769-IA8I is widely used in:
- Industrial machine control systems
- Conveyor and material handling systems
- Packaging and bottling equipment
- HVAC control systems
- Pump and motor control panels
- Manufacturing automation lines
- Process monitoring systems
- General-purpose PLC input acquisition systems
It is especially suitable for traditional industrial environments that still rely heavily on AC control circuits.
7. Recommended Models (Same Series / Related Modules)
| Model | Type | Key Parameters | Application |
|---|---|---|---|
| 1769-IA16 | AC Input Module | 16-point 120V AC input | High-density AC monitoring |
| 1769-IQ16 | DC Input Module | 16-point 24V DC input | Sensor-based systems |
| 1769-OB16 | Digital Output Module | 16-point transistor output | Actuator control |
| 1769-OF2 | Analog Output Module | 2-channel analog output | Process control |
| 1769-HSC | High-Speed Counter Module | Up to 1 MHz pulse input | Encoder applications |
8. Other Popular Models (Same Platform – Widely Used)
| Model | Type | Key Parameters | Application |
|---|---|---|---|
| 1769-L33ER | PLC Controller | Integrated EtherNet/IP CPU | Machine automation |
| 1769-L36ERM | PLC Controller | High-performance motion CPU | Advanced control systems |
| 1769-AENTR | Ethernet Adapter | Dual-port EtherNet/IP | Distributed I/O networking |
| 1769-SDN | DeviceNet Scanner | Fieldbus master module | Legacy industrial networks |
| 1769-ASCII | Serial Communication Module | ASCII protocol interface | Barcode/printer systems |
9. System Role Summary
The 1769-IA8I functions as a robust AC signal acquisition interface between industrial field devices and the PLC system. Its key role is safe and reliable conversion of high-voltage AC input signals into digital logic signals for automation processing.
Unlike standard non-isolated modules, its individually isolated channels provide enhanced electrical safety and system stability.
10. Summary
The 1769-IA8I is a high-reliability 8-point 120V AC digital input module designed for industrial automation environments requiring strong electrical isolation and stable signal detection.
Its main strengths include channel-level isolation, industrial durability, reliable AC signal processing, and compact high-density design.
It is widely used in traditional industrial control systems where AC-based wiring remains standard practice.