Westinghouse 2840A79G02 Output Card

The Westinghouse 2840A79G02, also cataloged as the 2840A79G02 Digital Output Card, operates as a dedicated hardware component for discrete load switching and binary control execution within Westinghouse Q-Line control chassis platforms.

Hardware Specifications

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

The Westinghouse 2840A79G02 controls digital switching states for field actuators and loop components operating alongside analog instrumentation under the 4-20 mA HART loop protocol. Dynamic output state transitions are driven by backplane logic commands, enabling discrete solenoid and relay control without inducing noise on adjacent analog telemetry circuits.

To protect host control logic from high-voltage field spikes and inductive kickback, the card features robust channel-to-channel isolation across discrete output channels. Galvanic separation isolates individual 60 VDC output circuits from central processor bus power, preventing ground loop currents and suppressing transient interference across the subrack backplane.

Frequently Asked Questions

Q: What is the maximum load voltage rating for output channels on the 2840A79G02 card?

A: Each digital output channel on the QBO G02 card is rated to switch loads up to a maximum threshold of 60 VDC.

Q: Is hot-swapping permitted for this module during active chassis operation?

A: No, field power and subrack backplane power must be isolated prior to insertion or extraction to prevent edge connector arcing and backplane bus fault conditions.

Field Installation Guidelines

1. Disconnect backplane power and field load supply lines prior to slot installation.
2. Align the top and bottom edges of the card assembly with the card guides of the assigned Q-Line subrack slot.
3. Slide the board into the slot until the edge connector seats completely into the rear backplane receptacle.
4. Fasten the front panel screws to secure the card and verify single-point grounding of all external DC wiring shields at the main cabinet ground bar.