The GE IS200TRTDH1CBB RTD Input Terminal Board is a compact resistance temperature device input terminal board used within GE Industrial Control Systems. As a member of the TRTD board family, the IS200TRTDH1CBB RTD Input Terminal Board accepts 16 three-wire RTD inputs and provides the field-side termination, noise suppression, and signal conditioning required for accurate temperature measurement in Mark VIe control architectures. The board communicates with the PRTD I/O packs, which convert the RTD resistance values into digital temperature values and transfer them to the Mark VIe controller.
The IS200TRTDH1CBB RTD Input 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 "TRTD" acronym identifies the board's functional designation as an RTD Input Terminal Board. The "H1" designation identifies the hardware group and the standard filtering variant, while the "CBB" 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 IS200TRTDH1CBB RTD Input Terminal Board is the H1D version of the TRTD family, which provides filtering compatible with the standard scan rate of the PRTD I/O pack. The TRTD family also includes the H2D version, which provides less filtering to allow proper performance when the fast scan rate of the PRTD is selected, and the SRTD simplex RTD input terminal board, which provides eight RTD inputs in a more compact DIN-rail mounted package. The IS200TRTDH1CBB RTD Input Terminal Board is designed for simplex applications, in which one PRTD I/O pack provides eight inputs and two PRTD I/O packs provide 16 inputs, and it is compatible with the PRTDH1A I/O pack but not with the DIN-rail mounted DRTD board.
This product introduction provides detailed technical information, functional descriptions, connector assignments, configuration guidance, and comprehensive specifications for the GE IS200TRTDH1CBB RTD Input 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 IS200TRTDH1CBB RTD Input Terminal Board is built around a robust RTD measurement architecture that supports 16 three-wire RTD inputs, each with noise suppression and high-frequency decoupling. The board performs several distinct functions that ensure accurate and reliable temperature measurement in electrically noisy industrial environments.
The 16 three-wire RTD inputs of the IS200TRTDH1CBB RTD Input Terminal Board are wired to two barrier-type terminal blocks, 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 immediately to the left of each terminal block, ensuring proper shielding and grounding of the RTD cables. The board requires double-shielded wire, and all shields must be terminated at the shield terminal strip, with the shields at the end device not left unterminated, to ensure proper noise immunity.
The board supplies a 10 mA DC multiplexed, not continuous, excitation current to each RTD, which can be grounded or ungrounded. The 16 RTDs can be located up to 300 meters (984 feet) from the turbine control cabinet with a maximum two-way cable resistance of 15 ohms, allowing the board to interface with RTDs installed at a considerable distance from the control cabinet. The RTD inputs and signal processing include high-frequency decoupling to ground at signal entry, and the RTD multiplexing in the PRTD is coordinated by redundant pacemakers so that the loss of a single cable or PRTD does not cause the loss of any RTD signals in the control database.
The A/D converter in the PRTD samples each signal and the excitation current four times per second for normal mode scanning and 25 times per second for fast mode scanning, using a time sample interval related to the power system frequency. Software performs the linearization for the selection of 15 RTD types, providing accurate temperature measurement across a wide range of RTD types and temperature ranges. RTD open and short circuits are detected by out-of-range values, and an RTD that is determined to be outside the hardware limits is removed from the scanned inputs to prevent adverse effects on other input channels. Repaired channels are reinstated automatically in 20 seconds or can be manually reinstated.
Compatibility and System Integration
The IS200TRTDH1CBB RTD Input Terminal Board is compatible with the PRTD I/O pack and supports simplex applications only. The PRTDH1A I/O pack is compatible with the RTD input terminal boards TRTDH1D, TRTDH2D, and the SRTD board, but not with the DIN-rail mounted DRTD board. In the Mark VIe control system, the PRTD I/O pack works with the TRTD, with one PRTD providing eight inputs and two PRTDs providing 16 inputs. The I/O pack plugs into the DC-37 pin connector on the terminal board and communicates with the controller over Ethernet, with one or two network connections possible depending on the system configuration.
The IS200TRTDH1CBB RTD Input Terminal Board provides galvanic isolation of the RTD input circuit, which requires changes in the terminal board transient protection as provided on the TRTDH1D and TRTDH2D boards. The H1D version of the board provides filtering compatible with the standard scan rate of the PRTD, making it suitable for applications where the standard scan rate is used. If the PRTD is mounted on an earlier revision of the TRTD board, an incompatibility will be reported, although no physical damage will occur.
Installation and Wiring
The IS200TRTDH1CBB RTD Input Terminal Board is designed for straightforward installation and field wiring. The board should be securely mounted, and one or two PRTD I/O packs, for simplex control of eight or 16 RTDs, should be directly plugged into the terminal board connectors. The packs should be mechanically secured using the threaded inserts adjacent to the Ethernet ports, with the inserts connecting with a mounting bracket specific to the terminal board type. The bracket location should be adjusted such that there is no right-angle force applied to the DC-37 pin connector between the pack and the terminal board, and this adjustment should only be required once in the life of the product.
The wires for the 16 RTDs connect directly to the two terminal blocks on the terminal board, and the board requires double-shielded wire with all shields terminated at the shield terminal strip. The board includes two DC-37 pin connectors that receive the PRTDs, one for each set of eight RTD inputs, allowing one or two PRTD packs to be connected depending on the system configuration. One or two Ethernet cables should be plugged into the pack to negotiate proper operation over either port, and if dual connections are used, the standard practice is to hook ENET1 to the network associated with the R controller. Power is applied to the pack by plugging in the connector on the side of the pack, and it is not necessary to remove power from the cable before plugging it in because the I/O pack has inherent soft-start capability that controls current inrush on power application.
The board size and mounting arrangement are designed for installation in standard turbine control cabinets, and the ToolboxST application is used to configure the I/O pack as necessary. If the configuration being downloaded contains I/O packs with different module IDs than the configuration currently running, the download may install incorrect firmware to some I/O packs, in which case the controller should be running the new configuration, the entire system should be restarted, and the ToolboxST Download Wizard should be started again.
RTD Types and Ranges
The IS200TRTDH1CBB RTD Input Terminal Board supports a wide range of RTD types and temperature ranges, providing flexibility for different temperature measurement applications. The RTD inputs are supported over a full-scale input range of 0.3532 to 4.054 V due to the 10 mA excitation current, and RTD inputs ranging from 34 to 405 ohms are supported.
The supported RTD types include 10 ohm copper, 100 ohm platinum, 120 ohm nickel, and 200 ohm platinum. The 10 ohm copper MINCO_CA and GE 10 ohm copper RTDs cover a range of −51 to 260 °C (−60 to 500 °F). The 100 ohm platinum RTDs include the SAMA 100, DIN 43760, IEC-751, MINCO_PD, MINCO_PE, PT100_DIN, MINCO_PA, IPTS-68, PT100_PURE, MINCO_PB, Rosemount 104, and PT100_USIND standards, covering ranges from −51 to 700 °C (−60 to 1292 °F). The 120 ohm nickel MINCO_NA and N 120 RTDs cover a range of −51 to 249 °C (−60 to 480 °F), and the 200 ohm platinum PT 200 RTDs cover a range of −51 to 204 °C (−60 to 400 °F). The board also supports the MINCO_PK 200 ohm platinum RTD with a range of −51 to 268 °C (−60 to 514 °F) for the 34 to 405.2 ohm input range.
The measurement accuracy varies by RTD type and group gain. For the 120 ohm nickel RTD with the normal 1.0 gain, the accuracy at 400 °F is 1.1 °C (2 °F). For the 200 ohm platinum RTD with the normal 1.0 gain, the accuracy at 400 °F is 1.1 °C (2 °F). For the 100 ohm platinum RTD with the normal 1.0 gain, the accuracy at 400 °F is 2.22 °C (4 °F), and with the gain 2.0 setting for the −51 to 204 °C range, the accuracy is 1.11 °C (2 °F). For the 10 ohm copper RTD with the 10 Ω Cu_10 gain, the accuracy at 400 °F is 5.55 °C (10 °F).
Diagnostics and Fault Detection
The IS200TRTDH1CBB RTD Input Terminal Board provides comprehensive diagnostic capabilities that assist with system verification and fault isolation. The I/O pack performs a power-up self-test that includes checks of RAM, Flash memory, Ethernet ports, and most of the processor board hardware, continuous monitoring of the internal power supplies for correct operation, and a check of the electronic ID information from the terminal board, acquisition board, and processor board to confirm that the hardware set matches, followed by a check that the application code loaded from flash memory is correct for the hardware set.
Each RTD type has hardware limit checking based on preset, non-configurable high and low levels set near the ends of the operating range. If this limit is exceeded, a logic signal is set, and the input is no longer scanned. If any one of the eight input's hardware limits is set, it creates a composite diagnostic alarm, L3DIAG_PRTD, referring to the entire board, and details of the individual diagnostics are available from the toolbox. The diagnostic signals can be individually latched and then reset with the RESET_DIA signal.
Each RTD input has system limit checking based on configurable high and low levels, which can be used to generate alarms and can be configured for enable or disable and as latching or non-latching. The RESET_SYS signal resets the out-of-limit signals, and details of the individual diagnostics are available from the toolbox. The diagnostic signals can be individually latched and then reset with the RESET_DIA signal if they go healthy.
The resistance of each RTD is checked and compared with the correct value, and if high or low, a fault is created. Each connector has its own ID device, which is interrogated by the I/O processor board. The terminal board ID is coded into a read-only chip containing the terminal board serial number, board type, revision number, and the connector location. If a mismatch is encountered, a hardware incompatibility fault is created, preventing the system from operating with incorrect or mismatched hardware.
Application Suitability and System Integration
The IS200TRTDH1CBB RTD Input Terminal Board is a versatile temperature measurement interface that can be used in a wide variety of GE Industrial Control System applications. Its 16 three-wire RTD inputs, supporting 10, 100, and 200 ohm platinum, 10 ohm copper, and 120 ohm nickel RTD types across a wide range of temperature ranges, allow the board to interface with the RTDs used in gas turbine exhaust temperature measurement, steam turbine metal temperature monitoring, bearing temperature monitoring, and many other industrial temperature measurement applications.
In Mark VIe control systems, the IS200TRTDH1CBB RTD Input Terminal Board works with the PRTD I/O pack, with one PRTD providing eight inputs and two PRTDs providing 16 inputs. The board's barrier-type terminal blocks and clearly labeled connectors simplify installation, verification, and maintenance, and the comprehensive diagnostics, including hardware limit checking, system limit checking, RTD resistance checking, and open and short detection, ensure that RTD faults are detected and reported.
The board's support for both grounded and ungrounded RTDs provides flexibility for different installation requirements, and the noise suppression circuitry and the requirement for double-shielded wire ensure accurate measurement even in electrically noisy industrial environments. The 10 mA multiplexed excitation current and the 14-bit A/D converter resolution provide accurate and stable temperature measurement across the full operating range.
Maintenance and Lifecycle
The IS200TRTDH1CBB RTD Input Terminal Board is designed for long service life with minimal maintenance. The board contains no 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 RTD readings are within specification, and confirmation that the shield terminals are properly connected.
The board's diagnostic features, including the hardware limit checking, the system limit checking, the RTD resistance checking, and the onboard ID chip, simplify troubleshooting and ensure that the correct board is installed in each location. If an RTD is determined to be outside the hardware limits, the input is removed from the scanned inputs to prevent adverse effects on other input channels, and the repaired channel is reinstated automatically in 20 seconds or can be manually reinstated.
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, the PRTD I/O packs should be disconnected, and the board should be removed from its mounting. The replacement board should be installed in the same position, and the terminal blocks and PRTD packs 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 IS200TRTDH1CBB RTD Input 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 IS200TRTDH1CBB RTD Input Terminal Board is a reliable, robust, and versatile temperature measurement interface for GE Industrial Control Systems. Its 16 three-wire RTD inputs, its support for 10, 100, and 200 ohm platinum, 10 ohm copper, and 120 ohm nickel RTD types across a wide range of temperature ranges, its comprehensive diagnostics, and its compatibility with the PRTD I/O pack provide the flexibility, accuracy, and reliability required for a wide range of industrial temperature measurement applications.
With its barrier-type terminal blocks, clearly labeled connectors, comprehensive diagnostics, and compatibility with the Mark VIe control system, the IS200TRTDH1CBB RTD Input 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 IS200TRTDH1CBB RTD Input 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 IS200TRTDH1CBB RTD Input Terminal Board provides the RTD input functionality required for reliable and efficient control system operation.
