Allen-Bradley 1797-OE8 Flex Ex Analog Output Module

Configured for signal generation in Flex Ex platforms, the Allen-Bradley 1797-OE8 (1797-OE8 Flex Ex Analog Output Module) provides direct physical and electrical execution of 8-channel analog signal control across hazardous industrial network environments.

Hardware Specifications

Industrial Control and Deterministic Networks

The 1797-OE8 integrates with the Flex Ex backplane, supporting I/O density scaling through modular expansion. The module utilizes backplane bus communication to synchronize output state changes with host controller logic. Firmware flash compatibility is managed via the system communication adapter, ensuring that output signal timing and deterministic performance meet the requirements of industrial control applications. The module supports configurable data formats, allowing for precise scaling of the 13-bit output resolution to match specific field device parameters.

Frequently Asked Questions

Q: Are the eight output channels isolated from each other?

A: No. The 1797-OE8 utilizes single-ended, non-isolated outputs. Users must ensure that connected field devices share a common reference point and that potential differences do not exceed the module's rated operating limits.

Q: Can this module be hot-swapped during operation?

A: No. Flex Ex modules must be isolated from field power and the backplane before removal or installation. Hot-swapping in a powered state may result in electrical damage to the backplane pins or the internal circuitry of the module.

Field Installation Guidelines

• Mounting: Install the module onto a compatible 1797 terminal base. Ensure the keyswitch is correctly aligned and locked to prevent improper seating, which could lead to intermittent electrical connections or communication errors.
• Wiring: Terminate field wiring according to the terminal base pinout map. Given the non-isolated output nature, ensure that current loops are properly configured to prevent ground loops that could degrade signal accuracy.
• Thermal Management: The module dissipates 5.4 W (18.4 BTU/hour) during operation. Install the module in a well-ventilated enclosure and maintain appropriate spacing from other heat-generating components to avoid thermal derating.
• Grounding: Bond the Flex Ex rack to the cabinet's protective earth ground using a low-impedance connection. This ensures stable reference levels for the analog outputs and provides protection against induced electrical noise.