Westinghouse 2840A79G01 Digital Output Card

Configured for discrete load switching and binary control execution in Westinghouse Q-Line control chassis platforms, the Westinghouse 2840A79G01 (2840A79G01 Digital Output Card) provides direct physical/electrical execution.

Suffix Breakdown & Model Matrix

The 2840A79 series utilizes group suffixes to define component populations, voltage ratings, and output channel configurations within the Q-Line system:

• 2840A79: Base Quick-Bus Output (QBO) printed circuit card architecture designed for discrete switching across Westinghouse Q-Line subracks.
• G01: Group-specific hardware drawing configuration specifying component loading, trace geometry, and 60 VDC output channel scaling.

Hardware Specifications

4-20 mA HART Loop Protocol & Channel-to-Channel Isolation

The Westinghouse 2840A79G01 controls discrete field load actuation for valves, solenoids, and interlocks operating parallel to continuous 4-20 mA HART loop protocol networks. Backplane logic signals actuate onboard solid-state switching paths, executing rapid binary control tasks without coupling high-frequency switching noise into adjacent analog loop instrumentation.

To safeguard backplane processing logic from field-side voltage transients, the board incorporates individual channel-to-channel isolation across all 60 VDC output lines. Galvanic separation isolates load currents and ground paths from the central subrack bus, preventing ground loops and protecting system electronics against inductive voltage surges.

Frequently Asked Questions

Q: What output voltage rating applies to the 2840A79G01 digital output card?

A: The QBO G01 card features discrete output channels rated for switching DC loads up to 60 VDC.

Q: Can the 2840A79G01 card be extracted or inserted while the Q-Line subrack is energized?

A: No, power to the subrack segment and field load loops must be de-energized prior to removing or installing the card to avoid edge-connector arcing and bus interruption.

Field Installation Guidelines

1. De-energize subrack backplane power and isolate external field load power sources prior to card insertion.
2. Align the top and bottom circuit board edges with the guide rails of the target Q-Line slot.
3. Slide the card into the slot until the rear connector fully mates with the backplane socket.
4. Tighten the front panel retaining screws to secure the card and ensure proper grounding to the rack chassis frame.