GE IS200AEPAH1A IS200AEPAH1AFD | Control Board

Core Function and System Role

The GE IS200AEPAH1A manages analog signal processing for Mark VI systems. Specifically, this board reads field sensors and positions actuators. Moreover, it communicates directly with the main VME backplane. The IS200AEPAH1AFD variant includes conformal coating for harsh industrial environments.

Technical Specifications Overview

This control board features sixteen differential analog input channels. Each channel provides 16-bit resolution for accurate measurements. Furthermore, the board includes eight analog output channels for valve control.

Parameter	Specification
Part Number	IS200AEPAH1A / IS200AEPAH1AFD
Type	Control Board / Analog I/O Module
Analog Inputs	16 Differential Channels
Input Resolution	16 Bits (65536 Counts)
Input Range	±10 Vdc or 0-20 mA
Analog Outputs	8 Channels
Output Range	±10 Vdc or 4-20 mA
Output Resolution	14 Bits
Backplane Interface	VME 96-pin Connector
Logic Power	5 Vdc from Backplane
Field Power	24 Vdc External
Dimensions (W x H x D)	233 x 160 x 20 mm
Weight	0.58 kg
Onboard Energy Storage	8 x 220 µF, 25V Capacitors

Connector Layout and Component Count

The board uses one 96-pin VME connector for backplane communication. For instance, this interface carries data, address, and power lines. Meanwhile, two 50-pin D-sub connectors handle all analog I/O wiring. The IS200AEPAH1AFD adds a thick conformal coating over all components.

Energy Storage and Signal Integrity

This control board includes local decoupling for stable analog conversion. Specifically, eight 220 µF capacitors filter both 5 Vdc and 24 Vdc supplies. Therefore, the board maintains accurate readings during transient loads. Additionally, onboard LED indicators show power and channel status. For example, a green LED confirms proper logic power. Yellow LEDs illuminate during analog output activity.

Diagnostic Features and Fault Detection

The board continuously checks each input channel for open wires. Consequently, it sets a fault flag when it detects a broken sensor connection. Moreover, the GE IS200AEPAH1A IS200AEPAH1AFD includes output readback for loop verification. This feature confirms that actuators receive the correct command signal. An onboard status register reports all channel health to the main controller.

Maintenance and Firmware Updates

You can update the board firmware through the VME backplane. Thus, you avoid removing the board for configuration changes. The board stores its calibration parameters in non-volatile memory. Therefore, settings persist through power cycles and board replacements.

Industrial Applications

This control board works inside GE Mark VI control cabinets. For reliable GE analog I/O processing, the IS200AEPAH1A and IS200AEPAH1AFD deliver exceptional performance. They provide accurate signal conditioning for steam and gas turbine control loops.