Product Overview

The GE IS210DTCIH1A / IS200DTCIH1A is a Mark VI Simplex Contact Input with Group Isolation Terminal Board used to interface discrete field contacts with the GE Mark VI turbine control system. It provides an organized termination point for contact-based field signals while incorporating group isolation within the terminal-board arrangement.

The board is suited to applications where the Mark VI system needs to monitor discrete equipment states, switch positions, permissive conditions, or other contact-based signals. Field devices are wired to the terminal board, and the associated Mark VI I/O hardware acquires the resulting input states for monitoring, sequencing, control, alarm, or protection functions.

The IS210DTCIH1A / IS200DTCIH1A is relevant to turbine control cabinets where multiple discrete field circuits must be terminated and maintained in an organized manner. During replacement or troubleshooting, the field contact assignments, group arrangement, I/O channel mapping, and associated Mark VI configuration should be checked together.

Technical Specifications

Product Features

• Simplex contact input terminal board for GE Mark VI control systems.
• Provides an organized interface for discrete field contact circuits.
• Incorporates group isolation within the contact-input termination arrangement.
• Connects field switches and contact devices with associated Mark VI I/O hardware.
• Supports monitoring of equipment states and discrete process conditions.
• Suitable for permissive, interlock, status, alarm, and sequencing-related input circuits.
• Keeps field wiring organized at the terminal interface.
• Separates field contact termination from the electronic I/O processing hardware.
• Supports maintenance and replacement of established Mark VI control installations.
• Helps technicians trace individual discrete input circuits during commissioning and troubleshooting.

Working Principle

The IS210DTCIH1A / IS200DTCIH1A provides the field-side termination interface for contact input circuits in the Mark VI system. A field contact device changes between its configured electrical states according to the condition of the monitored equipment or process.

Examples include auxiliary contacts, limit switches, equipment status contacts, permissive contacts, and other discrete devices. The field wiring carries the contact-state information to the terminal board, where the corresponding circuits are organized and connected to the associated Mark VI I/O hardware.

The signal path can be represented as:

Field Contact Device → Field Wiring → IS210DTCIH1A / IS200DTCIH1A → Mark VI Discrete I/O Hardware → Mark VI Control System

The group-isolation arrangement provides electrical separation between defined groups of contact circuits within the terminal-board architecture. This allows the field input arrangement to be organized by circuit groups rather than treating all connected contacts as one common electrical group.

The associated I/O hardware detects the resulting input states and makes the information available to the Mark VI control system. The control application can then use those states for equipment status, permissives, sequencing, alarms, interlocks, or other configured functions.

The terminal board itself does not execute the turbine control strategy. Its primary role is field termination, grouping, and electrical interfacing between the contact circuits and the associated I/O hardware.

Role in a GE Mark VI Discrete Input Control Architecture

The IS210DTCIH1A / IS200DTCIH1A occupies the field termination layer of the Mark VI discrete-input architecture. It provides the connection between contact-based field devices and the electronic I/O hardware that acquires their states.

Industrial Applications

Installation and Maintenance

1. Verify the board identification — Confirm that IS210DTCIH1A / IS200DTCIH1A matches the existing Mark VI documentation and intended replacement position.
2. Review the discrete I/O documentation — Check wiring diagrams, terminal assignments, contact groups, I/O channel mapping, and applicable turbine control documentation.
3. Isolate the affected circuits — Follow the approved plant procedure to place the relevant control and field circuits in a safe maintenance condition.
4. Identify contact-input connections — Label or record each field contact and its corresponding terminal position before disconnecting the existing board.
5. Inspect the replacement board — Check terminals, connectors, mounting features, and accessible surfaces for physical damage or contamination.
6. Inspect field contact wiring — Examine conductors for loose connections, damaged insulation, corrosion, or other conditions that could affect discrete signal integrity.
7. Remove the existing board carefully — Apply appropriate ESD precautions and avoid unnecessary mechanical force on terminals, connectors, or mounting hardware.
8. Install the replacement board — Position the IS210DTCIH1A / IS200DTCIH1A correctly within the Mark VI terminal arrangement and secure it according to the cabinet configuration.
9. Reconnect contact circuits — Restore each conductor to its documented terminal position and verify that the intended group-isolation arrangement is maintained.
10. Verify channel assignments — Confirm that each field contact corresponds to the correct Mark VI discrete input channel and configured logic point.
11. Perform a controlled input test — Restore the affected circuits and verify expected contact-state indications, alarms, permissives, or status points without unexpected input faults.
12. Document the maintenance activity — Record the board designation, terminal assignments, contact groups, test results, and any changes made during the replacement.

Related Components

Recommended Related Models

Key Advantages

• Provides organized contact-input termination within the GE Mark VI architecture.
• Supports group isolation for defined discrete field-circuit groups.
• Suitable for turbine status, permissive, alarm, and interlock inputs.
• Keeps field contact wiring separated from electronic I/O processing.
• Supports clear identification and tracing of discrete input circuits.
• Useful for maintenance and replacement of established Mark VI contact-input installations.

Technical FAQs

What is the function of the GE IS210DTCIH1A / IS200DTCIH1A?

The board provides a terminal interface for simplex contact-input circuits in a GE Mark VI system. It connects field contact devices with the associated discrete I/O hardware and incorporates group isolation within the terminal arrangement.

What does group isolation mean on this terminal board?

Group isolation refers to electrical separation between defined groups of input circuits within the terminal-board arrangement. It allows contact-input circuits to be organized into isolated groups rather than treating all field contacts as a single common electrical group.

What types of field devices can provide signals to this board?

Typical sources include auxiliary contacts, limit switches, relay contacts, permissive contacts, and other discrete field devices. The actual device types and circuit assignments depend on the turbine control application and system documentation.

What should be checked if a contact input remains incorrect after replacing the board?

Check the field contact device, wiring continuity, terminal assignment, group arrangement, associated I/O channel, and Mark VI configuration. A wrong terminal assignment or incorrect contact logic can produce an incorrect status even when the replacement terminal board itself is functioning normally.