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- 1794-ASB
- ControlNet Flex I/O Adapter Module
- USA
- 87 mm * 94mm * 92mm
- 0.5kg
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Technical Report: FLEX I/O Remote I/O Adapter 1794-ASB
1. Product Overview
The 1794-ASB is a FLEX I/O Remote I/O (RIO) communication adapter module used in distributed industrial automation systems. It provides a communication interface between FLEX I/O racks and legacy PLC systems that support Remote I/O protocols.
This module is part of the early FLEX I/O architecture and is widely used in legacy industrial control systems where Remote I/O remains the main communication method.
It supports up to 8 FLEX I/O modules per node, enabling compact distributed 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: Distributed modular I/O platform
- Network Type: Remote I/O (RIO legacy protocol)
- Installation Type: DIN rail / panel-mounted system
The FLEX I/O system is designed for modular expansion and distributed signal acquisition in industrial automation environments.
4. Product Introduction
The 1794-ASB functions as a Remote I/O adapter module connecting FLEX I/O modules to a PLC scanner via RIO communication.
Key functions include:
- Remote I/O communication at selectable speeds (57.6 / 115.2 / 230.4 kbps)
- Support for up to 8 FLEX I/O modules per node
- Built-in power conversion (24V DC to 5V DC backplane supply)
- LED status indicators for diagnostics (power, active, fault)
- Legacy PLC compatibility (PLC-2 / PLC-5 systems)
- DIN rail installation for industrial cabinets
It is commonly used in older automation systems that still rely on Remote I/O architecture.
5. Technical Parameters
5.1 Communication Performance
| Parameter | Value |
|---|---|
| Communication Protocol | Remote I/O (RIO) |
| Communication Rate | 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 | up to 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 / legacy controllers |
| Diagnostic Function | LED indicators (Power / Active / Fault) |
5.4 Physical Dimensions & Weight
| Parameter | Value |
|---|---|
| Height | 87 mm |
| Width | 68–90 mm (typical FLEX adapter range) |
| Depth | 69–92 mm |
| Mounting Type | DIN rail / panel mount |
| Weight | 0.50 kg (typical range 0.15–2.35 kg depending on revision/packaging) |
| 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-ASB is widely used in legacy industrial automation systems requiring Remote I/O communication.
Typical application areas:
- Legacy manufacturing lines
- Automotive production systems (older installations)
- Packaging machinery with PLC-5 systems
- Conveyor and material handling systems
- Steel and heavy industry control systems
- Retrofitting of existing Remote I/O networks
- Factory automation maintenance projects
- Distributed I/O expansion in legacy PLC architectures
Functional role:
- Remote I/O communication adapter
- Distributed signal interface module
- PLC-to-FLEX I/O bridge for legacy systems
- Modular I/O expansion node
7. Product Advantages
7.1 Legacy System Compatibility
Works with older PLC platforms such as PLC-2 and PLC-5.
7.2 Simple Remote I/O Architecture
Uses straightforward master-slave communication model.
7.3 Modular Expansion Capability
Supports up to 8 FLEX I/O modules per node.
7.4 Built-in Power Conversion
Converts 24V DC to 5V DC for internal backplane operation.
7.5 Reliable Industrial Operation
Designed for long-term stability in industrial environments.
7.6 Easy Maintenance
LED indicators simplify fault detection and system diagnostics.
8. Recommended Models (Same Series / Related Modules)
| Model | Description | Key Parameters |
|---|---|---|
| 1794-ACN | ControlNet adapter | 5 Mbps deterministic network |
| 1794-ACNR15 | Redundant ControlNet adapter | Dual-channel redundancy |
| 1794-AENT | EtherNet/IP adapter | Single-port Ethernet communication |
| 1794-AENTR | Dual-port EtherNet/IP adapter | Ring/linear topology support |
| 1794-ADN | DeviceNet adapter | CAN-based fieldbus system |
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 output switching |
| 1769-L33ER | PLC controller | CompactLogix CPU with Ethernet |
| 1769-PA4 | Power supply module | Industrial AC/DC power supply |
10. Summary
The 1794-ASB is a Remote I/O FLEX I/O adapter designed for legacy industrial automation systems.
Its stable Remote I/O communication, modular structure, and compatibility with older PLC platforms make it a widely used solution in maintenance, retrofit, and legacy system integration projects.