Key Parameters and Features
Core Features & Advantages
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Group Isolation and Surge Protection: The module’s standout feature is its group-isolated architecture with integrated noise suppression networks on every circuit. The onboard MOV (Metal Oxide Varistor) provides surge suppression and high-frequency noise filtering, shielding the control core from severe electrical transients and field surges common in heavy power generation plants .
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Removable Terminal Blocks for Fast Maintenance: The board features two barrier-type terminal blocks that can be unplugged from the board for maintenance or replacement. This design allows field wiring to remain connected while the board is swapped, significantly reducing downtime during replacement. Each terminal block accepts up to #12 AWG wires .
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Flexible Redundancy Architecture Support: The board supports Simplex, Duplex, and Triple Modular Redundant (TMR) configurations. In simplex mode, only connector JR1 is used. In TMR mode, all three connectors—JR1, JS1, and JT1—are utilized to provide triple redundancy for contact input signals .
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Reliable Signal Integrity with Hardware Filtering: Each input channel includes hardware RC filtering with approximately 4 ms response time to suppress noise and contact bounce, ensuring clean and reliable input signals. The board also monitors for loss of contact input excitation voltage, generating an alarm to prevent undefined input states .
Typical Applications
The IS200TBCIH2CCD is deployed in turbine control cabinets where reliable discrete signal acquisition is essential :
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Gas Turbine Control: Capturing limit switch, pressure switch, and trip button signals for turbine protection and sequencing
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Steam Turbine Control: Monitoring auxiliary contact status and safety interlock circuits
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Power Generation: Providing the physical interface between field devices and the Mark VIe control system in combined-cycle and simple-cycle plants
Frequently Asked Questions (FAQ)
Q1: What is the primary function of the IS200TBCIH2CCD?
A: It is a Contact Input Terminal Board for the Mark VI/VIe turbine control system. Its role is to receive up to 24 dry contact signals from field devices, provide group isolation, filtering, and surge protection, and route the signals to the associated I/O pack .
Q2: What is the difference between the IS200TBCIH2CCD and IS200TBCIH2C?
A: The CCD suffix represents a specific manufacturing revision and component configuration group. The H2C indicates the physical board revision. This specific combination is designed for standard dry contact applications on Mark VI platforms .
Q3: How many contact input channels does the board support?
A: It supports 24 dry contact inputs, wired to two barrier-type terminal blocks (TB1 and TB2), with 12 contacts per block .
Q4: What is the current load per input channel?
A: The first 21 inputs have a current load of 2.5 mA per point. The last 3 inputs have a higher load of 10 mA .
Q5: Can the terminal blocks be removed for maintenance?
A: Yes. The barrier-type terminal blocks can be unplugged from the board for maintenance or replacement. This allows field wiring to remain connected while the board is swapped .
Q6: What connector is used in Simplex configuration?
A: In Simplex configuration, only connector JR1 is used. For TMR configuration, all three connectors—JR1, JS1, and JT1—are utilized .
Q7: What safety features does the board include?
A: The board includes surge suppression via onboard MOV, high-frequency noise filtering, and monitoring for loss of contact input excitation voltage. It also features a metal frame with shield terminal strip for EMI mitigation .
Recommended Models & Related Products
The IS200TBCIH2CCD is part of the GE Mark VI/VIe terminal board family. Below are related models and components:
Selection Guidance: For existing Mark VI/VIe systems requiring 24-channel dry contact input termination, the IS200TBCIH2CCD is the appropriate part. Verify the I/O pack compatibility (e.g., IS220PDIAH1A) and redundancy configuration requirements before ordering. For DIN-rail mounted alternatives, consider the IS200STCIH6A .
