Allen-Bradley 1794-ASB Remote I/O Adapter

Series#: AllenBradley

Product Details

1794-ASB Allen-Bradley Remote I/O Adapter for Flex I/O systems.
Operates with 24V DC power supply for reliable field-side communication.
Supports up to 8 I/O modules per adapter, scalable for distributed control.
Compatible with ControlLogix, SLC 500, and PLC-5 via remote I/O network.
Reduces wiring costs and simplifies maintenance in harsh industrial environments.
Guaranteed 100% Original factory condition, offering fast and secure worldwide delivery.

Specification

The 1794-ASB Allen-Bradley Remote I/O Adapter with 24V DC power supply is a critical component for distributed control architectures, enabling seamless communication between Flex I/O modules and a remote I/O scanner. Designed for industrial automation systems requiring high reliability and low latency, this adapter supports up to 8 I/O modules per node, reducing field wiring and cabinet space. It operates over a standard remote I/O network (RIO) and is compatible with major Allen-Bradley controllers, including ControlLogix, SLC 500, and PLC-5. The 24V DC input ensures stable performance in demanding environments, while the built-in diagnostics simplify troubleshooting. Below are the detailed technical specifications derived from industry knowledge and standard Allen-Bradley documentation.

Parameter	Specification
Product Type	Remote I/O Adapter Module
Series	Flex I/O (1794 Series)
Part Number	1794-ASB
Power Supply Voltage	24V DC (nominal), 19.2V to 31.2V range
Power Consumption	5W typical, 8W maximum (with 8 modules)
Communication Protocol	Remote I/O (RIO) – single-channel, half-duplex
Data Rate	57.6 kbps, 115.2 kbps, or 230.4 kbps (selectable)
Maximum I/O Modules Supported	8 per adapter (any combination of 1794 discrete/analog modules)
Maximum Cable Length	10,000 ft (3048 m) at 57.6 kbps; 5,000 ft (1524 m) at 230.4 kbps
Network Topology	Trunk-line with drop cables (daisy-chain or star)
Connector Type	2-pin removable screw terminal for power; 3-pin Phoenix connector for RIO
Isolation	500V DC between power and logic
Diagnostics	LED indicators for power, network status, I/O status, and fault
Operating Temperature	0°C to +60°C (32°F to 140°F)
Storage Temperature	-40°C to +85°C (-40°F to 185°F)
Relative Humidity	5% to 95% non-condensing
Vibration Resistance	5 g at 10-500 Hz per IEC 60068-2-6
Shock Resistance	15 g peak for 11 ms per IEC 60068-2-27
Enclosure Rating	IP20 (open-style, suitable for cabinet mounting)
Dimensions (H x W x D)	3.62 in x 2.12 in x 4.50 in (92 mm x 54 mm x 114 mm)
Weight	0.35 lb (0.16 kg)
Certifications	UL, cUL, CE, ATEX (Zone 2), IECEx
Mounting	DIN rail (35 mm) or direct panel mount
Wiring	Use 14-22 AWG copper wire with 0.6 Nm torque
Compatible Controllers	ControlLogix (with 1756-RIO), SLC 500 (with 1747-SN), PLC-5 (with 1771-SN)
Ordering Information	Includes adapter, mounting hardware, and quick-start guide (sold separately: 1794-TB3 terminal base)