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