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- 87 mm * 94mm * 92mm
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Technical Report: FLEX I/O Remote I/O Adapter 1794-ASB2
1. Product Overview
The 1794-ASB2 is a FLEX I/O Remote I/O (RIO) communication adapter module, designed for distributed industrial control systems. It connects FLEX I/O terminal bases to legacy Remote I/O scanner systems, enabling centralized PLC control of distributed field signals.
This module belongs to an early-generation FLEX I/O architecture and is mainly used in legacy automation systems, retrofit projects, and RIO-based PLC networks.
It supports up to 8 FLEX I/O modules per node, allowing compact and modular I/O expansion.
2. Brand Information
- Brand: Industrial Automation Control Brand
- Product Category: Remote I/O Communication Adapter
- Technology Field: Industrial Fieldbus / Legacy Remote I/O Systems
- Manufacturing Origin: United States (varies by production batch)
3. Product Series
- Series Name: FLEX I/O Series
- System Architecture: Modular distributed I/O platform
- Network Type: Remote I/O (RIO protocol)
- Installation Type: DIN rail / panel-mounted system
The FLEX I/O family is designed for scalable distributed signal acquisition and PLC integration.
4. Product Introduction
The 1794-ASB2 functions as a Remote I/O adapter node that connects FLEX I/O modules to PLC scanners via RIO communication.
Key functions include:
- Remote I/O communication at selectable baud rates (57.6 / 115.2 / 230.4 kbps)
- Supports up to 8 FLEX I/O modules per node
- Built-in backplane power conversion (24V DC to 5V DC)
- LED indicators for power, module status, and fault diagnostics
- Compatibility with PLC-5 / PLC-2 / legacy RIO systems
- DIN rail mounting for industrial control cabinets
It is widely used in systems where legacy PLC infrastructure is still in operation.
5. Technical Parameters
5.1 Communication Performance
| Parameter | Value |
|---|---|
| Communication Protocol | Remote I/O (RIO) |
| Communication Speed | 57.6 / 115.2 / 230.4 kbps |
| Network Type | Master–Slave RIO |
| Max I/O Modules | up to 8 FLEX I/O modules |
| Cable Type | Shielded RIO communication cable |
| Topology | Daisy chain / trunk line |
5.2 Electrical Performance
| Parameter | Value |
|---|---|
| Input Voltage Range | 19.2–31.2 V DC |
| Nominal Voltage | 24 V DC |
| Backplane Power | 5 V DC internal conversion |
| FlexBus Output Current | up to 640 mA @ 5 V DC |
| Input Current | ~330–450 mA typical |
| Power Consumption | ~4.6 W |
| Isolation Voltage | 500 V AC (user power to backplane) |
| Inrush Current | ~23 A (2 ms) |
5.3 System Capability
| Parameter | Value |
|---|---|
| System Capacity | up to 8 FLEX I/O modules |
| Node Type | Remote I/O adapter node |
| Configuration Tool | PLC programming software (legacy systems) |
| Compatibility | PLC-2 / PLC-5 / Remote I/O scanners |
| Diagnostic Function | LED indicators (Power / Active / Fault) |
5.4 Physical Dimensions & Weight
| Parameter | Value |
|---|---|
| Height | 87 mm |
| Width | 68–90 mm (standard FLEX adapter housing range) |
| Depth | 69–92 mm |
| Mounting Type | DIN rail / panel mount |
| Weight | approx. 0.25 kg (module only) / shipping may vary up to ~0.5 kg+ |
| Form Factor | Single-slot communication adapter |
5.5 Environmental Conditions
| Parameter | Value |
|---|---|
| Operating Temperature | 0°C to 55°C |
| Storage Temperature | -40°C to 85°C |
| Humidity | 5%–95% non-condensing |
| Vibration Resistance | Industrial IEC standard |
| Shock Resistance | up to 30G |
6. Product Applications
The 1794-ASB2 is widely used in legacy Remote I/O industrial systems.
Typical application areas:
- Legacy automotive production lines
- PLC-5 based manufacturing systems
- Packaging machinery control systems
- Conveyor and logistics systems
- Steel and heavy industry automation
- Factory retrofit and modernization projects
- Distributed I/O expansion in existing RIO networks
- Industrial maintenance and spare-part replacement systems
Functional role:
- Remote I/O communication bridge
- Distributed signal acquisition node
- PLC-to-FLEX I/O interface
- Legacy automation expansion module
7. Product Advantages
7.1 Legacy System Compatibility
Designed for seamless integration with older RIO-based PLC systems.
7.2 Stable Field Communication
Reliable deterministic communication in industrial environments.
7.3 Modular Expansion
Supports up to 8 FLEX I/O modules per adapter node.
7.4 Built-in Power Conversion
Converts 24V DC to 5V DC for internal backplane operation.
7.5 Simple Maintenance
LED indicators simplify diagnostics and troubleshooting.
7.6 Retrofit-Friendly Design
Ideal for upgrading or maintaining older automation systems without replacing full infrastructure.
8. Recommended Models (Same Series / Related Modules)
| Model | Description | Key Parameters |
|---|---|---|
| 1794-ASB | Standard Remote I/O adapter | Basic RIO communication |
| 1794-ASBK | Keyed Remote I/O adapter | Enhanced mechanical keying |
| 1794-ASBLT | RIO adapter (PLC-5 optimized) | Legacy PLC compatibility |
| 1794-AENTR | EtherNet/IP dual-port adapter | Modern Ethernet communication |
| 1794-ACN | ControlNet adapter | 5 Mbps deterministic network |
9. Recommended Models (Same Brand – Popular Modules)
| Model | Type | Key Parameters |
|---|---|---|
| 1756-EN2T | Ethernet communication module | ControlLogix Ethernet interface |
| 1756-IB16 | Digital input module | 16-channel 24V DC input |
| 1756-OB16E | Digital output module | Electronic switching output |
| 1769-L33ER | PLC controller | CompactLogix CPU with Ethernet |
| 1769-PA4 | Power supply module | Industrial AC/DC power unit |
10. Summary
The 1794-ASB2 is a Remote I/O FLEX I/O adapter designed for legacy industrial automation systems requiring stable and deterministic RIO communication.
Its compatibility with older PLC platforms, modular structure, and stable industrial performance make it a reliable solution for retrofit, maintenance, and long-term operation of legacy control systems.