1794-ASB

Rated 4.5 with 27 reviews

DO Supply is NOT an authorized distributor for this manufacturer and therefore the manufacturer’s warranty does not apply. Product comes with DO Supply's 1-year warranty

Rockwell Disclaimer: The product is used surplus. DO Supply is not an authorized surplus dealer or affiliate for the Manufacturer of this product. The product may have older date codes or be an older series than that available direct from the factory or authorized dealers. Because DO Supply is not an authorized distributor of this product, the Original Manufacturer’s warranty does not apply. While many Allen-Bradley PLC products will have firmware already installed, DO Supply makes no representation as to whether a PLC product will or will not have firmware and, if it does have firmware, whether the firmware is the revision level that you need for your application. DO Supply also makes no representations as to your ability or right to download or otherwise obtain firmware for the product from Rockwell, its distributors, or any other source. DO Supply also makes no representations as to your right to install any such firmware on the product. DO Supply will not obtain or supply firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing firmware.

Revisions: A B C D Discontinued E Migration Obsolete Replacement REV A01 REV A02 REV L02 Ser A Ser B Ser C Ser D Ser E Series A Series B Series C Series D Series E

Description: The Allen-Bradley 1794-ASB is a Flex I/O communication adapter. This adapter is a DIN rail mounted device, which features One (1) Remote I/O (RIO) communication port, used for connecting Flex I/O rack to RIO capable controllers. It supports 57.6Kbps, 115.2Kbps, and 230.4kbps communication rate with an input voltage requirement of 19.2 - 31.2 VDC. It supports installation of up to Eight (8) Flex I/O modules.

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Description: The Allen-Bradley 1794-ASB is a Flex I/O communication adapter. This adapter is a DIN rail mounted device, which features One (1) Remote I/O (RIO) communication port, used for connecting Flex I/O rack to RIO capable controllers. It supports 57.6Kbps, 115.2Kbps, and 230.4kbps communication rate with an input voltage requirement of 19.2 - 31.2 VDC. It supports installation of up to Eight (8) Flex I/O modules.

About | Products Specs | FAQ

DO Supply is NOT an authorized distributor for this manufacturer and therefore the manufacturer’s warranty does not apply. Product comes with DO Supply's 1-year warranty

Revisions: A B C D Discontinued E Migration Obsolete Replacement REV A01 REV A02 REV L02 Ser A Ser B Ser C Ser D Ser E Series A Series B Series C Series D Series E

Warranty:	1 year DO Supply Warranty Included
Shipping:	Worldwide shipping via UPS, DHL, and TNT
Repairs:	We offer repair service for the 1794-ASB.
Exchange:	Exchange credit for your defective unit available.
Conditions:	We sell preowned surplus and refurbished parts.

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Rated 4.5 with 27 reviews

Technical Specifications for 1794-ASB

Manufacturer	Rockwell Automation
Power Dissipation	4.6 W @ 31.2V DC
Brand	Allen-Bradley
Product Description:	Remote I/O communication Adapter
Communication Port:	One (1) RIO port
Supported Protocol:	RIO
Supported topologies:	Daisy Chain
Data Transfer speed:	57.6Kbps, 115.2Kbps, and 230.4kbps
Indicators:	Power; Adapter Active; Adapter Fault; Local Fault
RIO cable:	Belden 9463 or Equivalent
Operating Temperature:	0 to 55 C (32 to 131 F)
Storage Temperature:	-40 to 85 C (-40 to 185 F)
Vibration:	Tested 5 g @ 10-500Hz per IEC 68-2-6
Operating Shock:	30 g peak acceleration, 11(+1)ms pulse width
Power Consumption:	330 mA @ 24V DC

Thermal Dissipation	15.7 BTU/hr @ 24V DC
Part Number/Catalog No.	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
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
UPC	10662468112175

Manufacturer	Rockwell Automation
Power Dissipation	4.6 W @ 31.2V DC
Brand	Allen-Bradley
Product Description:	Remote I/O communication Adapter
Communication Port:	One (1) RIO port
Supported Protocol:	RIO
Supported topologies:	Daisy Chain
Data Transfer speed:	57.6Kbps, 115.2Kbps, and 230.4kbps
Indicators:	Power; Adapter Active; Adapter Fault; Local Fault
RIO cable:	Belden 9463 or Equivalent
Operating Temperature:	0 to 55 C (32 to 131 F)
Storage Temperature:	-40 to 85 C (-40 to 185 F)
Vibration:	Tested 5 g @ 10-500Hz per IEC 68-2-6
Operating Shock:	30 g peak acceleration, 11(+1)ms pulse width
Power Consumption:	330 mA @ 24V DC
Thermal Dissipation	15.7 BTU/hr @ 24V DC
Part Number/Catalog No.	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
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
UPC	10662468112175

About 1794-ASB

The 1794-ASB is an Allen-Bradley Remote I/O communication Adapter module. This product belongs to the Flex I/O product family of distributed I/O modules.

The 1794-ASB has One (1) Remote I/O interface. This RIO protocol is a legacy protocol, utilizing Belden 9463 or equivalent cables for connecting the device to the RIO scanner. This module is compatible for use with Allen-Bradley Legacy controllers such as PLC2, PLC3 and PLC5 controllers as well as SLC500 automation platforms. It may also be used modern Logix controller platforms as well as with 3rd party devices and encompass partner modules.

The 1794-ASB sends and receives data to and from the controller, via Block Transfer Read (BTR) and Block Transfer Write (BTW) instructions. Using these instructions, packets of data may be sent simultaneously or sequentially, depending of the required speed.

The 1794-ASB supports communication rate of 57.6Kbps, 115.2Kbps, and 230.4kbps. The module’s intended supply voltage range is 11VDC-31.2VDC, including 5% ac ripple while the nominal supply is 24VDC. It supports installation of up to Eight (8) Flex I/O modules, for successful implementation of distributed I/O architecture. This module has built-in status indicator such as Power LED, Adapter Active LED, Adapter Fault LED and Local Fault LED. This module is mounted to a standard DIN rail and has an open type enclosure which means the 1794-ASB requires installation inside an appropriate enclosure that protects the device from industrial element and contaminants.

The maximum consumption of power is 450 mA from a constant 24 Volts DC power input. The maximum power dissipation 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 dimensions are approximately 4x 2x 4 inches and weigh only 6 ounces. The Allen-Bradley 1794-ASB is an obsolete Adapter Module and is part of the FLEX I/O series. It connects FLEX I/O modules to I/O scanner ports via a communication network. It has a built-in power supply which converts 24VDC to 5 VDC for the backplane in order to power the FLEX I/O modules. It also functions with the Allen Bradley PLC 3 and 5 series. Additionally, the 1794-ASB can recognize the safe state data for the FLEX Integral 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.

FAQ for 1794-ASB

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

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.

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

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

What is the 1794-ASB communication rate?

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

Can this module be purchased with a warranty?

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

Does the 1794-ASB carry any indicators?

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

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

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

What is the supported protocol by the 1794-ASB?

The 1794-ASB supports Remote I/O (RIO) communication.

What is the recommended cable to implement RIO connectivity?

Recommended Remote I/O cable is Belden 9463 or Equivalent cables.

Can I use this communication adapter with legacy controller products?

Yes, the 1794-ASB is compatible with PLC2, PLC3 processors with specific cautions. It may also be used with PLC5 and SLC500 controllers.

Technical Description of 1794-ASB

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.

Troubleshooting for 1794-ASB

The 1794-ASB remote I/O adapter/power supply is a Flex I/O module that is used to communicate between connected SLC or PLC racks across an RIO Link.
The 1794-ASB communicates with PLC, SLC, and ControlLogix models, using baud rates of 57.6k bits/s, 115.2k bits/s or 230.4k bits/s

Note: Three conditions can cause the remote I/O adapter to produce a communication fault.

no remote I/O communication for more than 100ms
no command issued to this address over the remote I/O link within the last 255 link transactions
communication is lost when the Rack Fault Select is enabled

1794-ASB Troubleshooting

Check dip switch settings

Ensure connecting pins are straight and aligned properly

Check settings on devices communicating directly to the 1794-ASB
Make sure the Baud rate is set correctly on all devices
Check communications cable and resistors for damage
Be sure that Line 1, Shield, Line 2 are correctly placed on the devices being used
Use the reset button to reset the module and resume communications on both modules when a communication error occurs
Check publication for additional information and configuration settings

Testing 1794-ASB

In this example we configure our G-data to ¼ rack before downloading.

The following parts will be used :

1747-L553
1747-SN
1746-A7
1794-TB3
1794-OA8
Configure communications device
Connect RIO cable
Apply power

(This is with the ASD module on with no communications)

Download program to the 1747-L553
Active light will illuminate, letting us know we have communications

Turn on the outputs through the output table
If actuated lights turn on, the 1794-ASB is working properly

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Repair Services for 1794-ASB

Type	Lead Time	Price	Action
Repair Service	2-4 weeks	$691	Add to Cart

Our highly skilled technicians can repair your 1794-ASB. All of our repairs come with a 1 Year DO Supply Warranty. Please contact us for additional information about our repair process.

Revisions for 1794-ASB

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

Revision Part #	Also Known as	Availability
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
1794-ASB Discontinued	1794-ASB/Discontinued, Series Discontinued, Rev Discontinued	Request Quote
1794-ASB E	1794-ASB/E, Series E, Rev E	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 Replacement	1794-ASB/Replacement, Series Replacement, Rev Replacement	Request Quote
1794-ASB REV A01	1794-ASB/REV A01, Series REV A01, Rev REV A01	Request Quote
1794-ASB REV A02	1794-ASB/REV A02, Series REV A02, Rev REV A02	Request Quote
1794-ASB REV L02	1794-ASB/REV L02, Series REV L02, Rev REV L02	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 Ser D	1794-ASB/D, Series D, Rev D	Request Quote
1794-ASB Ser E	1794-ASB/E, Series E, Rev E	Request Quote
1794-ASB Series A	1794-ASB/ies A, Series ies A, Rev ies A	Request Quote
1794-ASB Series B	1794-ASB/ies B, Series ies B, Rev ies B	Request Quote
1794-ASB Series C	1794-ASB/ies C, Series ies C, Rev ies C	Request Quote
1794-ASB Series D	1794-ASB/ies D, Series ies D, Rev ies D	Request Quote
1794-ASB Series E	1794-ASB/ies E, Series ies E, Rev ies E	Request Quote

Common misspellings:

l794-ASB
179A-ASB
1794-AS8
1794ASB

Reviews for 1794-ASB

Product Review

"The 1794-ASB is a Remote I/O communication adapter from the Flex I/O product family. This communication adapter is compatible for use with the legacy RIO protocol which may be used with PLC2, PLC3, PLC5 and SLC500 controllers. This module supports communication speed of 57.6Kbps, 115.2Kbps, and 230.4kbps communication rate. " -DO Supply Tech

Dimensions For 1794-ASB

Size
Input Type
Panel Cutout Height	in mm
Panel Cutout Width	in mm
Terminal Height	in mm
Terminal Width	in mm
Terminal Overall Depth	in mm
Terminal Mounted Depth	in mm

Dimensions For 1794-ASB