Allen-Bradley 1794-AND FLEX I/O DeviceNet Adaptor Module

The Allen-Bradley 1794-AND (1794-AND DeviceNet Adaptor Module) serves as the primary 1794-AND DeviceNet Adaptor Module utilized to execute distributed I/O communication across FLEX I/O platforms. The module provides a DeviceNet network interface between field-mounted FLEX I/O assemblies and higher-level controllers, supporting deterministic data exchange through CAN-based DeviceNet infrastructure.

Hardware Specifications

DeviceNet Network and FLEX I/O Integration

The 1794-AND functions as the communication gateway between DeviceNet networks and FLEX I/O field assemblies. The module exchanges cyclic and diagnostic data with connected I/O modules while presenting a unified network node to the supervisory controller.

Support for up to eight FLEX I/O modules allows distributed installation of input and output hardware near field equipment, reducing field wiring requirements and cabinet complexity. Network communication parameters are configurable through DeviceNet services or hardware address switches depending on system requirements.

Deterministic DeviceNet Communication

The DeviceNet interface supports selectable communication rates of 125 Kbps, 250 Kbps, and 500 Kbps. Node addressing is established through integrated thumbwheel switches, allowing physical assignment of network addresses from 00 through 63.

The adaptor supplies FlexBus logic power to connected FLEX I/O modules and coordinates data transfer between field devices and the network master. Isolation between user power and internal circuitry assists in protecting communication electronics from field-side electrical disturbances.

Frequently Asked Questions

Q: How many FLEX I/O modules can be connected to the 1794-AND?
A: The adaptor supports up to eight FLEX I/O modules on a single FLEX I/O rack.

Q: Which DeviceNet communication speeds are supported?
A: The module supports 125 Kbps, 250 Kbps, and 500 Kbps DeviceNet baud rates.

Q: How is the DeviceNet node address configured?
A: Node addresses from 00 to 63 are assigned using integrated hardware thumbwheel switches.

Field Installation Guidelines

• Set the node address before applying power.

• Verify DeviceNet baud rate matches the network configuration.

• Use approved DeviceNet cabling and termination practices.

• Mount on a 35 mm DIN rail or approved panel surface.

• Confirm FlexBus current requirements before adding I/O modules.