The GE IS200TRLYH1BDC Relay Output Terminal Board is a relay output terminal board used within GE Industrial Control Systems. As a member of the TRLY board family, the IS200TRLYH1BDC Relay Output Terminal Board holds 12 plug-in magnetic relays and provides the field-side termination, relay driver, fuse protection, and transient suppression required for discrete relay output signals in Mark VI and Mark VIe control architectures. The board supports simplex and triple modular redundant (TMR) applications and is designed for controlling field solenoids, interposing relays, contactors, and other discrete output devices.
The IS200TRLYH1BDC Relay Output Terminal Board is identified by the GE part numbering convention used throughout the Industrial Control Systems product line. The "IS200" prefix identifies the board as a GE Industrial Control Systems product, with "200" specifically indicating that the board is a base-level assembly. The "TRLY" acronym identifies the board's functional designation as a relay output terminal board. The "H1" designation identifies the hardware group and the 125 V DC/115 V AC application variant, while the "BDC" suffix identifies the artwork and functional revision combination. All digits are important when ordering or replacing any board, as boards of different revision levels may not contain identical hardware, and GE ensures backward compatibility of replacement boards while noting that different revision levels may not contain identical components.
The TRLY board family includes two main functional variants: the TRLYH1B board, which provides coil sensing for the relays and supports dry Form-C contact outputs or external solenoid driving for the first six relay circuits, and the TRLYH1C board, which provides contact sensing for the relays and is a variant of the TRLYH1B with several important differences. The TRLYH2C board is the 24 V DC version of the TRLYH1C. The IS200TRLYH1BDC Relay Output Terminal Board is the H1B version of the TRLY board with the BDC revision, providing the coil-sensing configuration with 125 V DC or 115/230 V AC solenoid power, which is widely used in applications where the relay coil state needs to be monitored and where either dry contacts or powered solenoid outputs are required.
This product introduction provides detailed technical information, functional descriptions, connector assignments, configuration guidance, and comprehensive specifications for the GE IS200TRLYH1BDC Relay Output Terminal Board, serving as an essential reference for control system engineers, maintenance technicians, and system integrators working with GE industrial control equipment.
Functional Architecture and Signal Processing
The IS200TRLYH1BDC Relay Output Terminal Board is built around a flexible relay output architecture that supports 12 plug-in magnetic relays, each with its own driver, fuse protection, and transient suppression. The board performs several distinct functions that ensure reliable and safe control of field output devices in industrial environments.
The first six relay circuits of the IS200TRLYH1BDC Relay Output Terminal Board are configured by jumpers for either dry Form-C contact outputs or to drive external solenoids. A standard 125 V DC or 115/230 V AC source, or an optional 24 V DC source with individual jumper-selectable fuses and on-board suppression, can be provided for field solenoid power. The next five relays, relays 7 through 11, are unpowered isolated Form-C contacts, and output 12 is an isolated Form-C contact used for special applications such as ignition transformers.
The relays are driven at the frame rate and have a 3.0 A rating. The rated contact-to-contact voltage is 500 V AC for one minute, and the rated coil-to-contact voltage is 1,500 V AC for one minute. The typical time to operate is 10 ms, and relays 1 through 6 have a 250 V metal oxide varistor for transient suppression between the normally open and the power return terminals. The relay outputs have a fail-safe feature that votes to de-energize the corresponding relay when a cable is unplugged or communication with the associated I/O processor is lost, ensuring that the field outputs assume a safe state in the event of a communication failure.
The relay drivers, fuses, and jumpers are mounted on the IS200TRLYH1BDC Relay Output Terminal Board, and for simplex operation, D-type connectors carry control signals and monitor feedback voltages between the I/O processors and the TRLY through connector JA1. For TMR applications, relay control signals are fanned into the TRLY from the three I/O processors R, S, and T through plugs JR1, JS1, and JT1, with these signals voted and the result controlling the corresponding relay driver. Power for the relay coils comes from all three I/O processors and is diode-shared, providing the redundancy and fault tolerance required for the TMR architecture.
Solenoid Power and Protection
The IS200TRLYH1BDC Relay Output Terminal Board provides comprehensive protection and power distribution for the field solenoids. Normal power is provided through connector JF1 with a pluggable 7 A source, and connector JF2 can be used to daisy-chain power to other TRLY boards. Alternatively, power can be wired directly to TB3 when JF1 and JF2 are not used. The TB3 connector provides alternate power capability with a 20 A rating, supporting 24 V DC, 125 V DC, 115 V AC, or 230 V AC power sources.
The solenoid power for outputs 1 through 6 is fused with two fuses per power circuit, with FU1 and FU7 supplying relay output 1, FU2 and FU8 supplying relay output 2, and so on through FU6 and FU12 supplying relay output 6. The fuses are rated at 3.15 A slow-blow, providing protection for the field solenoid circuits against overcurrent conditions. Power for the special solenoid on output 12 is connected to connector JG1, which supports customer power and customer return connections, and is available for gas turbine ignition transformers with a 6 A rating at 115 V AC or a 3 A rating at 230 V AC.
Jumpers JP1 through JP6 are removed in the factory and shipped in a plastic bag, and should be re-installed if power to a field solenoid is required. Conduct individual loop energization checks as per standard practices and install the jumpers as required. For isolated contact applications, remove the fuses to ensure that suppression leakage is removed from the power bus, and note that these jumpers are also for isolation of the monitor circuit when used on isolated contact applications.
Installation and Wiring
The IS200TRLYH1BDC Relay Output Terminal Board is designed for straightforward installation and field wiring. The wires for the 12 relay outputs connect directly to two I/O terminal blocks on the terminal board, with each block held down by two screws and having 24 terminals accepting up to #12 AWG wires. A shield terminal strip attached to chassis ground is located on the left side of each terminal block, ensuring proper shielding and grounding of the field wiring.
The solenoid power for outputs 1 through 6 is connected to connector JF1, and connector JF2 can be used to daisy-chain power to other TRLY boards. Alternatively, power can be wired directly to TB3 when JF1 and JF2 are not used. Power for the special solenoid on output 12 is connected to connector JG1, which supports customer power and customer return connections.
The wiring diagram for the TRLYH1B terminal board provides the detailed terminal assignments for the 12 relay outputs. Output 01 uses COM on terminal 2, SOL on terminal 4, NC on terminal 1, and NO on terminal 3, and this pattern repeats for outputs 01 through 06, providing the powered, fused solenoid Form-C outputs. Outputs 07 through 11 provide dry contact Form-C outputs, with COM, NC, and NO terminals for each relay, and output 12 provides the special circuit Form-C output with COM, NC, NO, and SOL terminals for the gas turbine ignition transformer.
The board size is 17.8 cm wide by 33.02 cm high (7.0 in x 13 in), and the shield bar provides a termination point for the cable shields, ensuring proper shielding and grounding of the field wiring. The terminal blocks can be unplugged from the terminal board for maintenance, simplifying field wiring and board replacement.
The IS200TRLYH1BDC Relay Output Terminal Board is the H1B variant of the TRLY board, which provides coil sensing for the relays. The coil sensing function monitors the relay coil state, allowing the control system to verify that each relay has operated correctly and to detect a failed relay coil. This diagnostic capability is important for critical control applications where a failed relay could prevent the field device from operating when commanded.
The TRLYH1C variant, in contrast, provides contact sensing for the relays rather than coil sensing. The TRLYH1C and H2C are the same as the standard TRLYH1B board except for several important differences: six jumpers for converting the solenoid outputs to dry contact type are removed, these jumpers were associated with the fuse monitoring, input relay coil monitoring is removed from the 12 relays, relay contact voltage monitoring is added to the 12 relays, individual monitoring circuits have voltage suppression and can be isolated by removing their associated jumper, and high-frequency snubbers are installed across the NO and SOL terminals on the six solenoid driver circuits and on the special circuit output 12.
The choice between the coil-sensing TRLYH1B and the contact-sensing TRLYH1C depends on the specific application requirements. The coil-sensing version is useful when the control system needs to verify the relay coil state, while the contact-sensing version is useful when the control system needs to verify the actual contact state and when the solenoid outputs are used as dry contacts.
Diagnostics and Fault Detection
The IS200TRLYH1BDC Relay Output Terminal Board provides comprehensive diagnostic capabilities that assist with system verification and fault isolation. The coil sensing function monitors the relay coil state, allowing the control system to verify that each relay has operated correctly and to detect a failed relay coil. The relay outputs have a fail-safe feature that votes to de-energize the corresponding relay when a cable is unplugged or communication with the associated I/O processor is lost, ensuring that the field outputs assume a safe state in the event of a communication failure.
In TMR applications, the relay control signals from the three I/O processors are voted, and the result controls the corresponding relay driver, providing the redundancy and fault tolerance required for the TMR architecture. Power for the relay coils comes from all three I/O processors and is diode-shared, ensuring that a failure in one I/O processor does not cause a loss of relay power.
The board includes fuse protection for the solenoid power circuits, with two fuses per power circuit for outputs 1 through 6, and the fuses are rated at 3.15 A slow-blow. If a fuse opens, the corresponding relay output is de-energized, protecting the field solenoid from overcurrent conditions. The board's diagnostic capabilities, including the coil sensing and the fuse protection, ensure that faults in the relay output circuits are detected and reported.
Configuration
The IS200TRLYH1BDC Relay Output Terminal Board is configured by jumpers and fuses. Jumpers JP1 through JP6 are removed in the factory and shipped in a plastic bag, and should be re-installed if power to a field solenoid is required. For isolated contact applications, remove the fuses to ensure that suppression leakage is removed from the power bus, and these jumpers are also for isolation of the monitor circuit when used on isolated contact applications.
Fuses FU1 through FU12 provide protection for the solenoid power circuits, and if power is required for relays 1 through 6, two fuses should be placed in each power circuit supplying those relays. For example, FU1 and FU7 supply relay output 1, FU2 and FU8 supply relay output 2, and so on through FU6 and FU12 supplying relay output 6. The jumpers and fuses should be configured according to the specific application requirements, and the wiring diagram should be consulted to ensure correct configuration.
Application Suitability and System Integration
The IS200TRLYH1BDC Relay Output Terminal Board is a versatile relay output interface that can be used in a wide variety of GE Industrial Control System applications. Its 12 plug-in magnetic relays, with the first six configurable for either dry Form-C contact outputs or external solenoid driving, and the next five plus output 12 providing isolated Form-C contacts, allow the board to interface with a wide range of field output devices, including pilot relays, interposing relays, contactors, solenoid valves, indicator lamps, and ignition transformers.
In Mark VI systems, the TRLY is controlled by the VCCC, VCRC, or VGEN board and supports simplex and TMR applications, with cables with molded plugs connecting the terminal board to the VME rack where the I/O boards are mounted. Connector JA1 is used on simplex systems, and connectors JR1, JS1, and JT1 are used for TMR systems. In Mark VIe systems, the TRLY works with the PDOA I/O pack and supports simplex and TMR applications, with the PDOA plugging into the DC-37 pin connectors on the terminal board.
The board's support for both simplex and TMR applications makes it suitable for a wide range of system architectures, from cost-sensitive simplex installations to critical TMR installations where high availability is required. In TMR applications, the board's voting of the relay control signals from the three I/O processors and the diode-shared relay coil power provide the fault tolerance and reliability required for the most demanding control applications.
The board's comprehensive protection features, including the two fuses per power circuit for relays 1 through 6, the MOV transient suppression on relays 1 through 6, and the fail-safe feature that de-energizes the relay on cable unplug or communication loss, ensure that the field devices and the process are protected from fault conditions. The board's coil sensing function allows the control system to verify that each relay has operated correctly and to detect a failed relay coil, providing the diagnostic capability required for critical control applications.
Maintenance and Lifecycle
The IS200TRLYH1BDC Relay Output Terminal Board is designed for long service life with minimal maintenance. The board contains plug-in magnetic relays as its only moving parts, and its robust construction ensures high reliability in continuous industrial operation. Routine maintenance consists of periodic visual inspection of the board, terminal blocks, and wiring, verification that the relay coils are operating correctly, and confirmation that the fuses are intact and the jumpers are set correctly for the application.
The board's diagnostic features, including the coil sensing and the fail-safe feature, simplify troubleshooting and ensure that the correct board is installed in each location. If a relay coil fails, the coil sensing function detects the failure and generates a diagnostic, allowing the maintenance technician to replace the failed relay or board. If a fuse opens, the corresponding relay output is de-energized, protecting the field solenoid from overcurrent conditions.
If the board requires replacement, the process is straightforward. After de-energizing the associated equipment and verifying that no power exists, the pluggable terminal blocks should be labeled and removed, and the board should be removed from its mounting. The replacement board should be installed in the same position, the jumpers and fuses set to match the original configuration, and the terminal blocks reconnected as labeled before returning the system to service.
GE Industrial Control Systems ensures compatibility of its replacement boards, even though boards of different revision levels may not contain identical hardware. When ordering a replacement IS200TRLYH1BDC Relay Output Terminal Board, provide the complete part number and description, the drive or system serial number, and the Material List (ML) number. The factory may substitute later versions based on availability and design enhancements, but backward compatibility of replacement boards is guaranteed.
Conclusion
The GE IS200TRLYH1BDC Relay Output Terminal Board is a reliable, robust, and versatile relay output interface for GE Industrial Control Systems. Its 12 plug-in magnetic relays, with the first six configurable for either dry Form-C contact outputs or external solenoid driving, its comprehensive fuse protection and MOV transient suppression, its coil sensing function, and its support for both simplex and TMR applications provide the flexibility, reliability, and diagnostic capability required for a wide range of industrial discrete output applications.
With its pluggable terminal blocks, clearly labeled connectors, comprehensive diagnostics, and compatibility with both Mark VI and Mark VIe architectures, the IS200TRLYH1BDC Relay Output Terminal Board is designed for easy installation, verification, and maintenance. Backed by GE's quality manufacturing, global support network, and commitment to backward compatibility, the IS200TRLYH1BDC Relay Output Terminal Board continues to deliver the performance, durability, and reliability that industrial users expect from GE. Whether used in a new installation or as a replacement for an existing board, the IS200TRLYH1BDC Relay Output Terminal Board provides the relay output functionality required for reliable and efficient control system operation.
