WESTINGHOUSE 7379A21G04 Analog Input Q-Line Card

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Description & Specifications

The QAV card converts an analog field signal to digital data (see Figure1 ).

The digital data is the summation of a frequency that has been counted for a time period. The time period is a multiple of the power line frequency (50 or 60 Hz).

（Figure1. QAV Block Diagram）

Each QAV card contains six individually isolated voltage-to-frequency converter circuits (channels). The output of each input circuit is processed by a common microcomputer and the resulting digital data is multiplexed to the Distributed Input/Output Bus (DIOB) as a 13-bit word.

Figure 2 shows a typical control system configuration using QAV cards. The QTB card is necessary for applications where large variations of power line frequency exist to obtain a high normal mode rejection. Up to 30 QAV cards (180 channels) can be used with one DIOB controller.

（Figure 2. QAV Typical Control System Using QAV Cards）

Features

Each QAV card has the following features:

² IEEE surge withstand capability

² Auto zero, auto gain correction

² Electrical isolation on all channels

² On-card digital memory (buffer)

² Common mode rejection

² Normal mode rejection

² Automatic reasonability test (shorted input)

² Auto-conversion check

² Jumper selectable 50/60 Hz operation

The QAV card is designed to be mounted in a standard Q-line card cage. Connection to the control system is made by a 34-pin rear-edge backplane connector which interfaces the UIOB or DIOB and a 56-pin front-edge connector, which connects to field terminals.

FAQ About 7379A31G04 Q-Line QAV Card

Q1: What distinguishing architectural capabilities make the 7379A31G04 a strategic component within sophisticated industrial control ecosystems?
A: The 7379A31G04 is engineered to support reliable signal processing and control operations, providing stable performance and seamless integration within complex automation infrastructures.

Q2: How does the 7379A31G04 contribute to operational resilience and process continuity in mission-critical environments?
A: Through its robust design and industrial-grade construction, the 7379A31G04 helps maintain system availability, minimizes unplanned downtime, and supports long-term operational reliability.

Q3: Why is the 7379A31G04 considered an advantageous solution for modernization and lifecycle extension projects?
A: The 7379A31G04 can facilitate the preservation of existing control architectures by offering dependable compatibility with legacy systems while supporting ongoing maintenance and upgrade initiatives.

Q4: Which performance characteristics of the 7379A31G04 are most relevant when evaluating deployment within high-demand automation applications?
A: Key evaluation criteria for the 7379A31G04 include its processing stability, communication efficiency, environmental durability, and ability to sustain consistent performance under continuous operating conditions.

Q5: In what ways can the 7379A31G04 optimize system diagnostics and maintenance efficiency across industrial facilities?
A: The 7379A31G04 is designed to support streamlined troubleshooting, facilitate rapid fault identification, and enhance maintenance workflows, thereby reducing service intervals and improving overall system productivity.

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