ALSTOM 12004-102-03 Analog Output AO Module

ALSTOM 12004-102-03 Analog Output AO Module
I. Basic Information
Full model: VOB8-B
Hardware material code: 12004-102-03
Firmware version: VER 1.0.0
Manufacturer: ALSTOM
System platform: IOBUS2 power station-specific IO rack system, equipped with DCS and SIS safety control systems for gas turbines / steam turbines
II. Channel Configuration
Channel quantity: 8 isolated analog output channels (AO)
Standard output signals: 4-20mA, for driving on-site regulating valves, actuators, and signal converters
Channel isolation: Each channel is independently electrically isolated, with a withstand voltage of 2500VAC, resisting strong electromagnetic interference in power plants
Load capacity: Maximum load for each channel is 750Ω, suitable for most industrial valve positioners

Core Functions
Fault-safe output configuration: Customizable hold / reset / full-scale output when communication lost or module fails, meeting SIS safety loop requirements
Comprehensive self-diagnosis: Short circuit, open circuit, output over-limit, module hardware failure, onboard LED indicator lights + remote alarm from the controller
High-precision output: Full-scale accuracy ≤ 0.15% FS, suitable for precise pressure, flow, and level regulation loops
Hot-swappable design: Replace modules online in the cabinet without affecting the operation of other IO cards in the rack

Electrical and Environmental Parameters
Power supply: Rack backplane 24VDC, supports dual redundant power supply input
Overall power consumption: ≤ 8W
Operating temperature: -20℃ ~ +70℃, installed in IP20 cabinet
Structure: 19-inch standard IOBUS2 rack card-type board

Backplane Communication
Special IOBUS2 high-speed backplane bus, interacting with the unit CPU controller in a cycle to regulate instructions, status, and fault diagnosis words; can be used for closed-loop regulation and safety interlock output control.

Comparison of IOBUS2 Board Cards in the Same Series
VIIB16-C 12011-105-00: 16-channel multi-function AI input card
I/OBE2 12004-104-00: 16DI/8DO digital IO card
VOOB8-B 12004-106-04 VER1.0.0: 8-channel AO output card (for regulating valve control)

Application Scenarios
Gas / steam turbine intake regulating valve, bypass valve, lubricating oil pressure regulating valve control
Continuous regulation loops for circulating water, boiler feed water flow, and level in power plants
Process valves and actuator drives for chemical combined cycle devices
Safety regulation output for SIS system, automatic regulation of process parameters