Woodward 5503-279 High Density Versatile Input Module

The Woodward 5503-279, also cataloged as the 5503-279 High Density Versatile Input Module, operates as a dedicated hardware component for multi-channel analog signal acquisition and signal conditioning within VME bus control platforms. Designed to process 34 analog input channels and 2 cold junction inputs, the module routes 4-20 mA current loops, thermocouple sensors, and RTD inputs directly to central processing logic via a high-speed backplane interface. The board incorporates 2 status LEDs for diagnostic verification across industrial control environments.

Hardware Specifications

Thermal Heat Sink Dissipation Profiles

The Woodward 5503-279 High Density Versatile Input Module features dense signal-conditioning circuitry designed to maintain precise channel isolation and internal thermal stability under maximum 34-channel operation. Printed circuit board copper planes serve as integrated heat sink dissipation pathways, removing thermal energy generated by active 4-20 mA input conditioning resistors and RTD excitation circuits. Passive airflow across the VME card slot enclosure keeps internal component junction temperatures within specified limits, preventing thermal drift across thermocouple and RTD measurement circuits.

Frequently Asked Questions

Q: What physical failure state is indicated if the module diagnostic LEDs issue a sequence of 13 flashes?

A: A sequence of 13 LED flashes indicates a Dual Port RAM Error on the onboard communication interface. This fault signifies a memory access hardware failure between the VME bus interface logic and local module memory, requiring board cycle reset or module repair.

Q: Can the 24 configurable thermocouple channels be mixed with 4-20 mA current loops on the same module?

A: Yes. 24 of the 34 input channels are independently configurable to accept either 4-20 mA current inputs or thermocouple millivolt signals, while the remaining 10 channels accommodate either 4-20 mA or RTD signals.

Q: Are hardware calibration potentiometers present on the front panel or circuit board?

A: No, the module contains no physical calibration potentiometers. All channel offset, span, and signal conversion parameters are software-configured via the VME bus CPU interface.

Field Installation Guidelines

Slot the module into the designated VME chassis card cage, ensuring backplane connectors are aligned before applying firm pressure to seat the board. Tighten top and bottom retaining screws to secure the module ground connection against chassis vibration. Run shielded, twisted-pair cables for all 4-20 mA, thermocouple, and RTD input connections, terminating signal braid shields at a single chassis grounding point to prevent ground loops. Keep low-voltage thermocouple and RTD signal conduits physically separated from high-current AC power cables and switching output lines to eliminate inductive noise coupling.