A-B 1794-ASB is a Flex I/O communication adapter produced by Allen-Bradley(Rockwell Automation).The following is a detailed introduction to the product:

1.Product Overview

The 1794-ASB adapter is a DIN rail-mounted device with a remote I/O(RIO)communication port for connecting a Flex I/O rack to a RIO-enabled controller.It supports high-speed data transmission and provides flexible configuration options to suit different application requirements.

2.Technical Specifications

Communication rate:supports three communication rates of 57.6Kbps,115.2Kbps and 230.4kbps.

Input voltage:Required to be 19.2 to 31.2VDC(some say that the rated input voltage is 24VDC and the input voltage range is 11.0 to 31.2VDC).

Flex I/O module support:Up to 8(some technical documents mention that 4 or 24 can be supported,depending on the version and configuration)Flex I/O modules can be installed,including analog input,analog output,digital input,digital output and other types.

Power consumption:330mA at 24V(some say that the power consumption is 6.31 watts at 24.4V DC),and 730mA at 12V.The maximum power dissipation is 4.6W and the heat dissipation is 15.7BTU/hr.

Other parameters:

Flexible bus output current:maximum 640mA.

Isolation voltage between user power supply and flexible bus:500VAC.

Operating temperature:32 to 131°F(0 to 55°C).

Operating humidity:5%to 95%,non-condensing.

Vibration:5g 10-500Hz.

Emission category:1,Class A.

Enclosure type rating:None(open),needs to be installed in an appropriate enclosure to protect the device.

3.Features

Remote I/O communication:Remote I/O communication is achieved by connecting the device to the RIO scanner using the Belden 9463 or equivalent cable through the RIO protocol.

Compatibility:Compatible with traditional Allen-Bradley controllers(such as PLC2,PLC3,PLC5 controllers and SLC500 automation platform),and can also be used for modern Logix controller platforms and third-party devices.

Data transmission:Send and receive data to the controller through block transfer read(BTR)and block transfer write(BTW)instructions,and data packets can be sent simultaneously or sequentially according to the required speed.

Status indication:It has built-in status indicators such as power indicator,adapter activity indicator,adapter fault indicator and local fault indicator,which is convenient for users to monitor the status of the device.

4.Application field

The 1794-ASB adapter is widely used in industrial automation systems,such as production line control,process control,mechanical control,etc.It is usually used to realize data exchange and communication between PLC and external devices to realize monitoring and control of production processes.

 

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