Rated 4.5 with 26 reviews


Description:   The Allen-Bradley 1794-ASB Remote IO Adapter has a 24 Volt DC Voltage, an 8 Module I/O Capacity, and an 11 to 31.2 Volt DC Input Voltage Range. It also operates with a 500V AC Isolation Voltage and a 330mA Power Consumption.

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Repairs: We offer repair service for the 1794-ASB.
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About 1794-ASB

The Allen-Bradley 1794-ASB is an old adapter module that is part of the flex I/O series. It supports 8 different modes of addressing, of which the main ones are complementary, complimentary 32, compact 32, and standard 32. Each mode allows the processor to receive different levels of information. This adapter works with a very low voltage, so a protected extra low voltage (PLEV) or a safety extra-low voltage (SELV) module should be used to power it. This unit requires an input voltage of up to 24 Volts DC nominal, where its input voltage rate goes from 19.2 to 31.2 Volts DC and it includes a 5% AC ripple. The communication rate supported by this product is 57.6kbps, 115.2kbps, and 230.4kbps. The 1794-ASB is equipped with 3 indicator lights which include green for an active adapter and red for a local fault as well as an adaptor fault. The flexbus output current is 640 mA at a maximum when the isolation voltage is 500 Volts AC between the user power and the flexbus. The maximum consumption of power is 450 mA from a constant 24 Volts DC power input. The maximum power dissipation by the Allen-Bradley 1794-ASB is 4.6 Watts at 31.2 Volts DC and the thermal dissipation is 15.7 BTU/hour at 31.2 Volts DC.

The 1794-ASB’s compact size makes it easy for the user to carry and use it. Its dimensions are approximately 4 x 2 x 4 inches and it weighs only 6 ounces. The Allen-Bradley 1794-ASB is an obsolete Adapter Module and is part of the FLEX I/O series. The 1794-ASB connects FLEX I/O modules to I/O scanner ports via a communication network. It has a built-in power supply which converts 24 Volts DC to 5 Volts DC for the backplane in order to power the FLEX I/O modules. The 1794-ASB adapter can also join an existing system or replace a previous unit. It also functions well with the Allen Bradley PLC 3 and 5 series. Additionally, the 1794-ASB can recognize the safe state data for the FLEX Integra analog modules, and it is capable of using thirty-two point FLEX I/O units. The user must use a 1794-ASB Series D or later module when utilizing the FLEX Integral analog modules in the configuration of your setup. This unit can communicate with the 1747-SN via Remote I/O communications and RSLogix 500 software.

Technical specifications:

Part Number:1794-ASB
Product Type:Remote IO Adapter
Series:Flex I/O
Module Capacity:8 Modules
Mount:DIN Rail
Controller Platform:FlexLogix
Diagnostic Indicators:Status
Enclosure :IP20, Open Type
Series Available:1794-ASB - A/B/C/D/E
Power Dissipation:4.2 Watts
Communication Rate:57.6, 115.2, 230.4 Kbps
External Power Supply:450 mA at 24 Volts DC
Voltage:24 Volts DC
Dimensions:4 x 2 x 4 inches


Question: How many I/O Modules can a 1794-ASB communicate with?

Answer: One 1794-ASB adapter can communicate with up to 8 FLEX I/O modules. This module powers the internal logic for up to 8 I-O Flex modules.


Question: What are the alternate series for the 1794-ASB module?

Answer: This module's alternate series include Series A, B, C, D, and Series E adapter modules.


Question: What is the 1794-ASB communication rate?

Answer: The 1794-ASB communication rates are 57.6 Kbps, 115.2 Kbps, and 230.4 Kbps.


Question: Can this module be purchased with a warranty?

Answer: Yes, the 1794-ASB comes with a free one-year warranty from DO Supply, Inc.


Question: Does the 1794-ASB carry any indicators?

Answer: Yes, this module contains a number of Diagnostic Status indicators.


Question: Where can I send the 1794-ASB to be repaired?

Answer: DO Supply, Inc. offers a variety of repair services for the 1794-ASB.

Please refer to the manual for more information about the 1794-ASB such as the wiring diagrams, data sheets, firmware information and migration or obsolescence details.

Revision Part # Also Known as Availability
1794-ASB Discontinued
1794-ASB/Discontinued, Series Discontinued, Rev Discontinued Request Quote
1794-ASB Migration
1794-ASB/Migration, Series Migration, Rev Migration Request Quote
1794-ASB Obsolete
1794-ASB/Obsolete, Series Obsolete, Rev Obsolete Request Quote
1794-ASB REV A02
1794-ASB/REVA02, Series REVA02, Rev REVA02 Request Quote
1794-ASB REV L02
1794-ASB/REVL02, Series REVL02, Rev REVL02 Request Quote
1794-ASB Replacement
1794-ASB/Replacement, Series Replacement, Rev Replacement Request Quote
1794-ASB Series A
1794-ASB/SeriesA, Series SeriesA, Rev SeriesA Request Quote
1794-ASB Series D
1794-ASB/SeriesD, Series SeriesD, Rev SeriesD Request Quote
1794-ASB Series B
1794-ASB/SeriesB, Series SeriesB, Rev SeriesB Request Quote
1794-ASB Series C
1794-ASB/SeriesC, Series SeriesC, Rev SeriesC Request Quote
1794-ASB Series E
1794-ASB/SeriesE, Series SeriesE, Rev SeriesE Request Quote
1794-ASB Ser A
1794-ASB/A, Series A, Rev A Request Quote
1794-ASB Ser B
1794-ASB/B, Series B, Rev B Request Quote
1794-ASB Ser C
1794-ASB/C, Series C, Rev C Request Quote
1794-ASB E
1794-ASB/E, Series E, Rev E Request Quote
1794-ASB REV A01
1794-ASB/REVA01, Series REVA01, Rev REVA01 Request Quote
1794-ASB Ser E
1794-ASB/E, Series E, Rev E Request Quote
1794-ASB Ser D
1794-ASB/D, Series D, Rev D Request Quote
1794-ASB A
1794-ASB/A, Series A, Rev A Request Quote
1794-ASB B
1794-ASB/B, Series B, Rev B Request Quote
1794-ASB C
1794-ASB/C, Series C, Rev C Request Quote
1794-ASB D
1794-ASB/D, Series D, Rev D Request Quote

Common misspellings: 1794ASB