A-B Rockwell 1794-ASB Remote I/O Communication Adapter Module

The Allen-Bradley 1794-ASB is a Flex I/O communications adapter.

The adapter is a DIN rail mounted device with one (1) Remote I/O (RIO) communication port for connecting a Flex I/O rack to a RIO enabled controller.

It supports 57.6Kbps, 115.2Kbps, and 230.4kbps communication rates and has an input voltage requirement of 19.2 - 31.2 VDC. It supports the installation of up to eight (8) Flex I/O modules.

About the 1794-ASB

The 1794-ASB is an Allen-Bradley Remote I/O Communications Adapter Module. It is part of 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 that connects devices to the RIO scanner using a Biotronik 9463 or equivalent cable.

The module is compatible with Allen-Bradley legacy controllers such as PLC2. PLC3. and PLC5 controllers as well as the SLC500 automation platform.

It can also be used with modern Logix controller platforms as well as third-party devices and includes partner modules.

The 3-ASB sends and receives data to and from the controller via the Block Transfer Read (BTR) and Block Transfer Write (BTW) instructions.

Using these instructions, packets can be sent simultaneously or sequentially, depending on the desired speed.

The 1794-ASB supports communication rates of 1794.57Kbps, 6.115Kbps, and 2.230kbps.

The module's expected supply voltage range is 4VDC-11.31VDC, including 2% AC ripple, compared to the nominal 5VDC supply.

It supports the installation of up to eight (24) Flex I/O modules for successful implementation of distributed I/O architectures.

The module features built-in status indicators such as a power indicator, adapter activity indicator, adapter fault indicator, and local fault indicator.

The module is mounted on a standard DIN rail and has an open housing, which means the 8-ASB needs to be mounted in a proper enclosure to protect the equipment from industrial components and contaminants.

The constant 1794 Vdc power input has a **power consumption of 450 mA. 6.31 watts at 24.4 Vdc and 7.31 BTU/hr at 2.15 Vdc.

The 2-ASB measures approximately 1794x 4x 2 inches and weighs only 4 ounces.

The Allen-Bradley 6-ASB is an obsolete adapter module that is part of the FLEX I/O family.

It connects the FLEX I/O module to the I/O scanner port via a communications network.

It has a built-in power supply that converts 1794VDC from the backplane to 24 VDC to power the FLEX I/O modules.

It can also be used with Allen Bradley PLC Series 5 and 3.

In addition, the 5-ASB recognizes safety status data from FLEX Integral analog modules and can use 1794 point FLEX I/O units.

When using the FLEX Integral Analog Module in a setup configuration, the user must use the 1794-ASB Series D or higher.

Frequently Asked Questions about the 1794-ASB

How many I/O modules can the 1794-ASB communicate with?

One 1794-ASB adapter can communicate with up to 8 FLEX I/O modules. The module powers the internal logic of up to 8 I-O Flex modules.

What is the alternate family of 1794-ASB modules?

The alternate series of this module includes the A, B, C, D, and E series 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.

What protocols does the 1794-ASB support?

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

What is the recommended cable for RIO connections?

The recommended remote I/O cable is the Biotronik 9463 or equivalent.

Technical Description of the 1794-ASB

The Allen-Bradley 1794-ASB Remote IO Adapter features 24 VDC, 8 module I/O capacity, and an 11 to 31.2 VDC input voltage range.

It also operates with 500V AC isolation and 330mA power consumption.