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GE IS200WROBH1AAA Mark VI Wide Relay Output Board

The GE IS200WROBH1AAA, also cataloged as the IS200WROBH1AAA Wide Relay Output Board, operates as a dedicated hardware component for isolated relay switching and turbine trip circuit execution within GE Mark VI / Mark VIe turbine control systems. The board provides field relay outputs for solenoids, breaker controls, and auxiliary alarm circuits.

Hardware Specifications

Parameter	Specification
Model	IS200WROBH1AAA
Brand	GE
Origin	United States
Weight	0.62 kg
Operating Temp	-40 deg C to +70 deg C
Power Consumption	<=4.5 W from paired WRDO I/O pack
Product Type	Wide Relay Output Boards
System Platform	Mark VI / Mark VIe Speedtronic Turbine Control Systems
Output Channels	16 isolated relay outputs
Relay Type	Electromechanical Form C dry contacts
Field Voltage	Up to 125 VDC or 115 VAC
Channel Rating	Max 3 A at 125 VDC resistive loads
Isolation	2500 VAC channel-to-backplane galvanic isolation
Protection	Per-channel fuses and TVS diodes for inductive kickback suppression
Communication	Mark VIe proprietary IONet bus, relay feedback sampled at 100 Hz
Mounting	VME rack slot with screw-mount bracket
Hot Swap Capability	Not hot-swappable; rack lockout/tagout required
Environmental Protection	Full conformal coating for oil mist, humidity, and dust exposure

Profinet / EtherNet-IP Deterministic Networks and I/O Density Scaling

The IS200WROBH1AAA functions as a Wide Relay Output Board within the GE Mark VI / Mark VIe distributed turbine control architecture. The module provides 16 isolated relay channels for direct control of field switching devices including trip solenoids, breaker interfaces, ESD isolation valves, and alarm circuits.

The relay output structure supports I/O density scaling by providing multiple independent switching channels within a single rack interface. Galvanic isolation between relay circuits and the controller backplane reduces ground loop effects and electrical interference coupling.

The board communicates through the Mark VIe proprietary IONet bus architecture. Relay feedback sampling at 100 Hz provides status monitoring of output conditions within the control system.

The AAA revision includes full conformal coating on the PCB assembly. This protection layer reduces exposure effects from moisture, oil mist, dust, and condensation in turbine control cabinet environments.

Frequently Asked Questions

Q: Is the IS200WROBH1AAA module hot-swappable during system operation?
A: No. The board is not designed for hot swap replacement and requires rack lockout/tagout procedures before removal or installation.

Q: How many relay output channels are available on the IS200WROBH1AAA?
A: The board provides 16 isolated electromechanical relay output channels using Form C dry contacts.

Q: What protection features are integrated for field relay circuits?
A: Each relay channel includes individual fuse protection, and TVS diodes are used for suppression of inductive kickback effects.

Field Installation Guidelines

Install the IS200WROBH1AAA in the designated GE Mark VI / Mark VIe VME rack position using the specified mounting hardware.

Verify relay wiring connections, field voltage levels, and contact assignments before applying power. Ensure connected loads remain within the specified relay contact ratings.

Follow lockout/tagout procedures before replacing or servicing the board because the module does not support hot swap operation.

Route relay output wiring separately from sensitive analog signal cables and communication wiring. Apply proper cabinet grounding and shield termination practices to reduce electrical interference.

Inspect the conformal coating condition during maintenance activities and prevent mechanical damage to the protective PCB surface.

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