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GE IS200WROBH1A Mark VI Relay Output Board

The GE IS200WROBH1A, also cataloged as the IS200WROBH1A Relay Output Board, operates as a dedicated hardware component for isolated relay switching and field load control within GE Mark VI / Mark VIe Speedtronic turbine control systems. The board provides fused relay outputs for solenoids, valves, alarms, and safety interlock circuits through galvanically isolated switching paths.

Hardware Specifications

Parameter	Specification
Model	IS200WROBH1A
Brand	GE
Origin	United States
Weight	0.52 kg
Dimensions	37 cm W x 30 cm H x 4 cm D
Operating Temp	-40 deg C to +70 deg C
Power Consumption	Logic supply: 24 VDC from host terminal board
Product Type	Relay Output Board
System Platform	Mark VI / Mark VIe Speedtronic Turbine Control Systems
Output Channels	6 fused relay outputs + 1 unfused relay output
Fuse Rating	3.15 A fast-blow, rated 500 VAC / 400 VDC
Field Voltage	Up to 125 VDC or 115 VAC
Isolation	1500 VDC galvanic isolation between channels and backplane
Form Factor	VME-compatible daughterboard
Approvals	UL Listed, CE, CSA

EtherNet/IP and Backplane Control Interface Characteristics

The IS200WROBH1A operates as a relay output interface board within the Mark VI control architecture. The board receives low-voltage logic commands from the host terminal assembly and converts these signals into isolated field switching actions. Galvanic isolation separates field circuits from control electronics, reducing coupling of field-side electrical disturbances into the controller backplane.

The relay output structure supports I/O density scaling within the Mark VI platform by providing multiple independently protected switching channels. Per-channel fuse protection limits fault propagation during short-circuit conditions and allows individual field circuit protection without disabling unrelated relay outputs.

The board supports simplex, dual-redundant, and triple modular redundant (TMR) system configurations when installed according to the Mark VI hardware architecture. Firmware and application compatibility are managed through the host control system configuration rather than independent board-level processing.

Frequently Asked Questions

Q: What type of loads can the IS200WROBH1A relay outputs control?
A: The board provides relay switching outputs for field devices including solenoids, valves, alarms, and safety interlock circuits with field voltage capability up to 125 VDC or 115 VAC.

Q: How is electrical isolation implemented on the IS200WROBH1A?
A: The board provides 1500 VDC galvanic isolation between relay output channels and the controller backplane interface to separate field wiring from logic circuits.

Q: Does each relay output include independent protection?
A: Six relay output channels include individual 3.15 A fast-blow fuse protection. One additional relay output is provided without fuse protection.

Field Installation Guidelines

Install the IS200WROBH1A in the designated Mark VI / Mark VIe VME-compatible control rack position according to the system hardware drawing.

Field wiring should be routed separately from high-voltage power conductors and high-current switching cables to reduce electromagnetic interference coupling. Shielded cables should be used where required by the field device installation standard, with cable shields terminated according to the turbine control grounding practice.

Verify relay contact ratings, field voltage levels, and fuse requirements before energizing connected loads. Confirm terminal connections, grounding paths, and isolation requirements during commissioning tests.

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