GE VMIACC-5595-208 - VMEbus Intelligent Analog Controller Module

GE VMIACC-5595-208 – VMEbus Intelligent Analog Controller Module

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Product Introduction:
The GE VMIACC-5595-208 is an intelligent analog I/O controller module for VMEbus systems. The “VMIACC” designation stands for VMEbus Intelligent Analog Controller Controller, indicating it is not a simple passive I/O board but contains its own onboard processor for signal conditioning, scaling, and alarm processing. The “5595” identifies the specific hardware family, and “208” indicates a high-density configuration with 208 analog channels (typically a mix of inputs and outputs). This module offloads the main CPU by performing all analog signal processing locally, sending only processed data and alarm status to the host processor via the VMEbus.

Technical Specifications:
Board Type: VMEbus Intelligent Analog I/O Controller
Channel Count: 208 analog channels (configurable as 128 AI / 80 AO, or other ratios)
Resolution: 16-bit A/D and D/A conversion
Input Types: 4-20mA, 0-10V, RTD (Pt100, Pt1000), Thermocouple (all types)
Output Types: 4-20mA, 0-10V
Update Rate: 10ms per channel (simultaneous sampling)
On-Board Processor: 32-bit microcontroller for local signal processing
Isolation: 1500V RMS channel-to-channel and channel-to-ground
VMEbus Interface: D32/A32 VME64 compliant
Power Consumption: Approximately 10 Watts
Operating Temperature: 0 to 60 degrees Celsius
Form Factor: 6U VMEbus Eurocard

Functional Features:
Local Signal Conditioning: Performs cold junction compensation, linearization, and square root extraction on-board.
Local Alarm Processing: Compares every input against configurable setpoints and sends only alarm status to the CPU, drastically reducing VMEbus traffic.
Simultaneous Sampling: All 208 channels are sampled at the exact same instant, critical for phase-sensitive measurements.
Burnout Detection: Automatically detects open thermocouple or RTD wires and alarms immediately.
Self-Calibration: Supports on-board zero and span calibration using a precision voltage source.
Watchdog Timer: On-board watchdog ensures the local processor never hangs.

Application Scenarios:
Power Plant Instrumentation: Monitors hundreds of temperature, pressure, and flow signals in a boiler or turbine.
Chemical Process Control: Manages large-scale batch processes with hundreds of analog measurements.
Environmental Monitoring: Collects data from hundreds of weather stations or water quality sensors.
Test and Measurement: Serves as the data acquisition front-end for automated test systems.

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