GE IS200AEPCH1BAA – Analog Expansion Pack (AEPC) for Mark VIe Control Systems

1. Product Introduction

The GE IS200AEPCH1BAA is an Analog Expansion Pack (AEPC) used in GE’s Mark VIe control platform, primarily to extend the number of analog inputs available in turbine, generator, and balance-of-plant control applications. It connects directly to compatible terminal boards and forms part of the distributed I/O architecture widely used in gas and steam turbine automation.

This module is factory-engineered for high-speed data acquisition, electrical noise immunity, and extended environmental durability, making it suitable for heavy-duty industrial power systems.

---

2. Main Functions & Benefits

• Expands analog input capacity for Mark VIe controllers

• Supports both 4–20 mA current loop and ±5 V / ±10 V voltage signals

• Fast and accurate signal sampling for turbine protection and regulation

• Integrated diagnostic monitoring for channel health and reference stability

• Conformal-coated PCB, suited for high-humidity and corrosive atmospheres

• Hot-swappable design reduces downtime during maintenance

• Seamless configuration in ToolboxST software with auto-discovery

• Compatible with multiple terminal boards including WETB, TBCI, and others

  
  

---

3. Technical Specifications 

• Analog Input Channels: 16 channels per pack (multiplexed)

• Signal Types Accepted: Current (4–20 mA), Voltage (0–10 V, ±5 V)

• Resolution: 16-bit A/D conversion

• Isolation: Channel-to-backplane isolation via terminal board circuitry

• Communication: Ethernet-based I/O Network (I/O-Net)

• Power Source: Supplied through backplane connector (no external PSU)

• Diagnostics: Open-loop detection, over-range monitoring, firmware integrity check

• Operating Temp Range: –40°C to +70°C

• GE Hardware Series: Mark VIe I/O subsystem

• Module Revision: H1B indicating hardware and firmware revision code

---

4. Internal Hardware Layout

1. A/D Conversion Section – Captures high-resolution analog data

2. Signal Conditioning Filters – Removes EMI/RFI and surge noise

3. Ethernet Interface Processor – Real-time deterministic data transfer

4. Self-Test Controller – Monitors health and reports via ToolboxST

5. Backplane Connector – Links directly to I/O rack and power lines

6. LED Status Indicators – Module OK, Network OK, Channel Fault

   
   

---

5. Application Scope

• Gas turbine control and regulation loops

• Steam turbine valve and load control feedback

• Power plant auxiliary analog sensing (pressure, temperature, vibration, etc.)

• Industrial automation requiring high-density analog data acquisition

• Retrofit upgrades replacing older Mark V / Mark VI analog systems

• Distributed I/O networks in critical process systems

---

6. Installation & Wiring Notes

• Installs directly onto the terminal board or T-shaped mounting rail

• No field wiring lands on the module—wiring terminates at companion terminal board

• Ensure proper cable shielding and grounding to maximize analog accuracy

• Firmware revision should match system version to avoid I/O mismatch alarms

• After installation, run I/O Commissioning Test via ToolboxST

  
  

---

7. Maintenance & Lifecycle

• Recommended to keep at least one spare per I/O cabinet for redundancy

• Periodic review of self-diagnostic logs helps detect early channel drift

• Module is conformal coated—do not clean with solvent-based sprays

• Replace only with GE-certified spare parts to maintain system SIL rating

• Firmware updates are applied using the Mark VIe Maintenance Utility

---

8. Additional Information

• The suffix BAA identifies pack version, component revision, and protective coating level

• Fully compatible with Mark VIe simplex, dual, and TMR architectures

• Often paired with IS200TBCIH1B terminal board for 16-channel analog input wiring