GE IS200EMIOH1A IS200EMIOH1AFB | PC Board

Core Function and System Role

The GE IS200EMIOH1A expands I/O capacity for Mark VI turbine control systems. Specifically, this board handles mixed digital and relay functions. Moreover, it connects directly to the main VME backplane. The IS200EMIOH1AFB variant includes conformal coating for harsh industrial environments.

Technical Specifications Overview

This PC board features sixteen digital input channels for field devices. Each input accepts 24 Vdc signals with optical isolation. Furthermore, the board provides eight relay outputs for actuator control.

Parameter	Specification
Part Number	IS200EMIOH1A / IS200EMIOH1AFB
Type	PC Board / I/O Expansion Module
Digital Inputs	16 Channels, 24 Vdc
Input Isolation	2500 Vrms Optocouplers
Relay Outputs	8 Channels, Form C (SPDT)
Output Voltage	125 Vdc Maximum
Output Current	2 A per Channel (Resistive)
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	0.55 kg
Onboard Energy Storage	6 x 220 µF, 16V 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 field I/O wiring. The IS200EMIOH1AFB adds a thick conformal coating over all components.

Energy Storage and Signal Integrity

This PC board includes local decoupling capacitance for stable logic operation. Specifically, six 220 µF capacitors filter the 5 Vdc backplane supply. Therefore, the board maintains reliable performance during transient loads. Additionally, onboard LED indicators show power and channel status. For example, green LEDs confirm active digital inputs. Yellow LEDs illuminate when relay outputs energize.

Diagnostic Features and Fault Reporting

The board continuously monitors input channels for signal transitions. Consequently, it captures state changes with 1 ms resolution. Moreover, the GE IS200EMIOH1A IS200EMIOH1AFB includes output readback for relay verification. This feature confirms that mechanical contacts actually change state. An onboard watchdog timer resets the board if communication stops.

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 operating parameters in non-volatile flash memory. Therefore, settings persist through power cycles and board replacements.

Industrial Applications

This PC board works inside GE Mark VI control cabinets. For reliable GE I/O expansion, the IS200EMIOH1A and IS200EMIOH1AFB deliver exceptional performance. They provide flexible signal interfacing for steam and gas turbine balance-of-plant equipment.