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Help CenterGE VMIVME-3215-000 Thermocouple Signal Acquisition Module
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GE VMIVME-3215-000 is an 8-channel intelligent thermocouple signal acquisition module based on the VME bus. It features a built-in microprocessor to implement linearization and cold junction compensation. Specially designed for high-temperature monitoring applications such as aerospace, energy and metallurgy, it provides high-precision, high-isolation temperature signal acquisition.
1. Positioning and System Relationship
System Affiliation
Part of the GE Intelligent Platforms VMIVME series, model VMIVME-3215-000, classified as a thermocouple analog input module. It adopts the standard 3U VME form factor with single-slot width, complies with the ANSI/IEEE 1014-1987 bus standard, must be installed in a VME chassis, communicates with the CPU via the VME bus, and cannot operate independently.
Core Role
Positioned as a high-precision temperature acquisition front-end for VME systems, its core responsibilities:
Direct connection of 8 channels of thermocouple signals (J/K/T/E/R/S/B/N/W-Re, etc.) with differential isolated inputs
Onboard 16-bit microcontroller for automatic cold junction compensation, signal linearization and digital filtering
12-bit plus sign A/D conversion for high-precision temperature digitization
High common-mode rejection and channel isolation to resist strong interference in industrial environments
Upload temperature data via the VME bus (A24/D16), supporting interrupts and data readback
Mounting Position
3U VME single-slot installation, equipped with screw terminal blocks on the front panel for front-side wiring; onboard status LEDs indicate running, calibration and fault conditions; supports hot swapping and is compatible with standard VME chassis (e.g., 7000 series).
System Architecture
Field thermocouples → VMIVME-3215-000 (signal conditioning, isolation, compensation, linearization, A/D conversion) → VME bus → CPU module → HMI/SCADA/control system
This forms a closed-loop temperature monitoring chain of “signal input – intelligent processing – data upload – monitoring and control”.
2. Functions and Technical Features
1. Intelligent Acquisition for Multiple Thermocouple Types
Channels: 8 differential isolated inputs, configurable for single-ended / differential mode
Compatible types: J, K, T, E, R, S, B, N, W-Re and other mainstream thermocouples
Intelligent processing: onboard 16-bit MCU for automatic cold junction compensation, linearization and digital filtering
Resolution: 12-bit plus sign, typical measurement accuracy ≤ ±0.1°C
Sampling rate: up to 100Hz per channel, 8-channel sequential scanning
2. High Isolation and Anti-Interference Performance
Channel isolation: 1000V DC electrical isolation between channels and backplane
Common-mode rejection: 120dB @ 60Hz, ensuring stable acquisition in strong industrial interference environments
Surge protection: compliant with IEC 61000-4-5, excellent lightning surge immunity
ESD protection: 8kV air, 4kV contact
3. VME Bus Communication
Bus standard: VMEbus A24/D16 slave mode, supporting MBLT/BLT fast transfer
Data interface: dual-port registers for low-overhead CPU reading
Trigger modes: software trigger, timed polling, interrupt trigger (IRQ1–7)
Status readback: real-time upload of channel status, faults and calibration information
4. Industrial-Grade Reliability
Operating temperature: -40°C ~ +85°C, wide-temperature fanless design
Storage temperature: -55°C ~ +105°C
Vibration resistance: MIL-STD-810F, 10–2000Hz, 5g
Humidity: 5%–95% RH (non-condensing)
Power consumption: typical 8W @ 5V DC (powered by VME backplane)
3. Technical Specifications
Product Identification
Model: GE VMIVME-3215-000
Brand: GE (General Electric)
Series: VMIVME
Type: 8-channel intelligent thermocouple input module
Specification: 3U VME single-slot
Country of origin: United States
Core Parameters
Input channels: 8 differential isolated thermocouple inputs
Resolution: 12-bit plus sign
Isolation voltage: 1000V DC (channel to system)
Common-mode rejection: 120dB @ 60Hz
Cold junction compensation: local / remote selectable, accuracy ±0.5°C
Bus interface: VME A24/D16
Power supply: 5V DC (backplane), max. 10W
Dimensions: 233.35mm × 100mm (3U VME)
Weight: approx. 0.4kg
Compatibility
Compatible with: all GE VMIVME CPU modules (e.g., 7666, 7751, 4150)
Supports: VME64, VMEbus A24/D16 standard chassis
Software: supports drivers for VxWorks, Linux, Windows
4. Compatible Systems and Supporting Components
Required Components
3U VME chassis and power supply module
VMIVME series CPU module
Thermocouple cables (compensation wires)
Terminal blocks and shielded cables
Common Accessories
Thermocouple connectors, terminal strips
Surge protectors, signal isolators (for high-interference environments)
Identical modules (for multi-channel expansion)
5. Application Scenarios
Aerospace: temperature monitoring of engine test benches, combustion chambers and exhaust flames
Energy & Power: temperature measurement of gas turbines, steam turbines, boiler tubes and generators
Metallurgy: high-temperature monitoring of blast furnaces, converters, continuous casters and heating furnaces
Petrochemical: temperature acquisition of reactors, cracking furnaces, flues and high-temperature pipelines
Military: temperature measurement of marine power systems, armored vehicle engines and rocket engines
Industrial furnaces: high-precision temperature control for ceramic, glass and cement kilns
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