Distributed Control Solution — Allen-Bradley 1794-ASB | Flex Remote I/O Series
The Allen-Bradley 1794-ASB is a Remote I/O Adapter module within the Rockwell Automation Flex I/O platform, designed to extend PLC control capability to remote field devices over a Remote I/O (RIO) network. It enables engineers to distribute I/O across large facilities without running individual signal cables back to the main control panel — reducing wiring costs, improving system scalability, and simplifying maintenance.
Where This Product Is Used
The 1794-ASB is deployed in industrial environments where distributed I/O architecture is required. Typical application sites include:
- Automotive Assembly Lines — Connecting remote I/O drops to SLC 500 or PLC-5 controllers managing conveyor, welding, and stamping stations
- Food & Beverage Processing Plants — Distributed sensor/actuator control across filling, capping, and packaging lines with hygienic zone separation
- Water & Wastewater Treatment Facilities — Remote pump station monitoring and valve control over long cable runs
- Oil & Gas Upstream/Midstream — Field junction box I/O expansion in hazardous-area-adjacent control architectures
- Material Handling & Warehousing — Sortation conveyor systems with multiple I/O drops managed from a central SLC or PLC-5 rack
- Pulp & Paper Mills — Process line I/O distribution across large plant footprints
- Mining & Minerals Processing — Crusher, conveyor, and separator control with remote I/O drops at each machine station
Technical Specifications
- Catalog Number: 1794-ASB
- Series: Flex I/O Remote I/O Adapter
- Network Protocol: Allen-Bradley Remote I/O (RIO) — 1771 compatible
- Baud Rate: 57.6K, 115.2K, 230.4K bps (DIP switch selectable)
- Node Address: 0–7 (quarter-rack), 0–3 (half-rack), 0–1 (full-rack) — configurable via DIP switches
- Rack Size Support: Quarter, Half, or Full rack emulation
- Max I/O Modules per Adapter: Up to 8 Flex I/O modules
- Power Supply Voltage: 24V DC (from Flex I/O power supply, e.g. 1794-PS13)
- Current Draw: 500 mA @ 5V DC (backplane); 24V DC from field power supply
- Operating Temperature: 0°C to +55°C (32°F to 131°F)
- Storage Temperature: -40°C to +85°C
- Relative Humidity: 5% to 95% non-condensing
- Mounting: DIN rail (EN 50022, 35mm) or panel mount
- Enclosure Rating: Open-style (requires enclosure)
- Dimensions (H × W × D): 87 × 23.5 × 87 mm (approx.)
- Weight: 180 g
- Agency Certifications: UL Listed, CE Marked, CSA Certified
Why Engineers Specify This Model
- Proven RIO Compatibility — Directly compatible with SLC 500 and PLC-5 controllers using the 1771 Remote I/O protocol, making it the standard choice for legacy system expansions
- Flexible Rack Emulation — Quarter/half/full rack modes allow precise I/O mapping without wasting scanner capacity
- Compact DIN-Rail Form Factor — The Flex I/O platform’s slim profile fits in tight enclosures and junction boxes where traditional 1771 racks cannot
- Hot-Swap Module Support — Individual Flex I/O modules can be replaced without powering down the entire adapter (with appropriate system design)
- Reduced Field Wiring Cost — A single RIO trunk cable replaces dozens of individual signal runs, cutting installation labor significantly
- Scalable Architecture — Up to 8 I/O modules per adapter; multiple adapters can be daisy-chained on the same RIO network
Complete System Bill of Materials
A fully operational 1794-ASB remote I/O drop typically requires the following components:
- 1794-ASB — Remote I/O Adapter (this item)
- 1794-PS13 or 1794-PS1 — Flex I/O Power Supply (24V DC)
- 1794-TB3 / 1794-TB3S — Terminal Base for each I/O module
- 1794-IB16 / 1794-OB16 — 16-point DC Input / Output modules (as required)
- 1794-IE8 / 1794-OE4 — Analog Input / Output modules (if analog I/O needed)
- 1770-CD — Remote I/O Coaxial Cable (Belden 9463 equivalent)
- 1770-XT — RIO Network Terminator (required at each end of the RIO trunk)
- SLC 5/03, 5/04, or PLC-5 controller with RIO scanner capability
Compliance & Industry Standards
- UL 508 — Industrial Control Equipment
- CE Directive — EMC Directive 2014/30/EU; Low Voltage Directive 2014/35/EU
- CSA C22.2 No. 142 — Process Control Equipment
- RoHS Compliant — Restriction of Hazardous Substances (where applicable to product generation)
- IEC 61131-2 — Programmable Controllers: Equipment Requirements and Tests
Quality Assurance & Sourcing
- All units sourced through verified industrial automation supply channels with documented chain of custody
- Each module undergoes functional verification prior to dispatch: power-on test, DIP switch continuity check, and backplane connector inspection
- Packaging includes anti-static protection and moisture barrier for long-term storage integrity
- Konmask.com specializes in genuine and refurbished Allen-Bradley Flex I/O components for MRO and project procurement
- Condition clearly stated on each listing: New Surplus, Refurbished, or Used — Tested
How to Source This Part
To place an order or request a quote for the 1794-ASB:
- Online: Add to cart directly from this page — stock availability shown in real time
- Email RFQ: support@konmask.com — include quantity, required condition, and delivery timeline
- Phone/WhatsApp: +0086 19859288691 — available for urgent MRO sourcing inquiries
- Bulk / Project Orders: Contact us for volume pricing on multi-unit requirements for system integrators and OEMs
- Lead Time: In-stock items ship within 1–3 business days; sourced items typically 5–10 business days
Application-Specific FAQ
Q: Is the 1794-ASB compatible with ControlLogix or CompactLogix controllers?
A: No. The 1794-ASB uses the legacy Allen-Bradley Remote I/O (1771 RIO) protocol, which is natively supported by SLC 500 and PLC-5 controllers. ControlLogix/CompactLogix systems require the 1794-AENT (EtherNet/IP) or 1794-ACN15 (ControlNet) adapter instead.
Q: How many I/O points can one 1794-ASB adapter support?
A: Up to 8 Flex I/O modules per adapter. With 16-point modules (e.g. 1794-IB16), this yields up to 128 discrete I/O points per drop. Analog modules reduce the total point count depending on module density.
Q: Can I mix digital and analog modules on the same 1794-ASB adapter?
A: Yes. The Flex I/O platform supports mixed module types on a single adapter, provided total backplane current draw does not exceed the power supply rating.
Q: What cable is required for the Remote I/O network?
A: The RIO network uses Belden 9463 (or equivalent) coaxial cable, available as Allen-Bradley 1770-CD. Maximum network length depends on baud rate: up to 3,048m at 57.6K bps.
Q: Is a new or refurbished unit available?
A: Konmask.com stocks both new surplus and refurbished/tested units. Condition is clearly indicated on the product listing. Contact us if you require a specific condition or certification documentation.
Q: Do you provide a warranty?
A: Yes. All units carry a minimum 90-day functional warranty. Extended warranty options are available for project-critical applications — contact our sales team for details.
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Contact: support@konmask.com | +0086 19859288691
