Quick Sizing & Sourcing Snapshot
- Manufacturer: General Electric (GE)
- Part Number: IS200AEPBH1B
- System Platform: GE Mark VIe / Mark VIeS (VME-based)
- Hardware Type: AEPB Series Analog Output I/O Pack (Intelligent)
- Architectural Role: Occupies the I/O Pack slot in Mark VIe racks, converting digital commands from the controller into galvanically isolated 4-20mA current loops or Voltage signals for final control elements (valves, dampers).
- Key Specifications: Output Channels: 8 Isolated; Signal Range: 4-20mA / 0-20mA / +/- 10V; Load Drive: Up to 750Ω (Current); Isolation: 500V DC channel-to-backplane.
System Architecture & Operational Principle
The sits at the execution layer of the Mark VIe control system. It physically mounts to a terminal board (typically IS200TBAIH or IS200TBCIH), connecting via a 64-pin ribbon cable for field wiring and a VME backplane edge for network/power.
In the control loop, this module receives “Demand” values (e.g., Fuel Stroke Reference or Inlet Guide Vane position) from the IS215UCV or IS420UCS controller over the IONet (Ethernet) backplane. Unlike passive AO cards, the “H1B” is an intelligent pack. It hosts its own fail-safe logic: if the IONet connection is lost or the controller stops sending updates, the can be configured to hold last state, drive to a programmed safe value (e.g., 4mA or 20mA), or follow a ramp-down profile defined in ToolboxST.
The “H1B” suffix typically denotes specific component tolerances or firmware revisions within the AEPB family (Analog Output, Extended Performance, Type B). It drives the current loop by modulating an internal PWM signal through a precision resistor network. Crucially, each of the 8 channels is galvanically isolated from the logic side and from each other, meaning you can have Channel 1 sinking current from a 24VDC source and Channel 2 sourcing from a separate 48VDC supply without creating ground loops—provided your terminal board wiring supports independent commons.
Core Technical Specifications
- Output Channels: 8 Independent (Isolated)
- Output Types: Software Selectable: 4-20mA, 0-20mA, +/- 10V, 0-10V
- Current Load Capability: 750 Ω maximum (at 24V DC external supply)
- Voltage Load: Min 1kΩ (Voltage mode)
- Resolution: 16-bit DAC per channel
- Accuracy: +/- 0.2% of Span (Typical, Full Temp Range)
- Isolation: 500 V DC (Channel-to-Backplane/Logic); Channel-to-Channel isolated
- Power Draw: +5 V DC from Backplane (Approx 0.6A / 3.0W typical)
- Diagnostics: Open Circuit Detect (per channel), Short Circuit Protection, Module Health (Run/FLT)
- Environment: -30°C to +65°C; Conformal Coated (Humidity/Vibration Resistant)
