IS200DRTDH1A - Compact RTD Terminal Board

IS200DRTDH1A -  Compact RTD Terminal Board IS200DRTDH1A -  Compact RTD Terminal Board

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Part No.: IS200DRTDH1A
Manufacturer: General Electric
Product Type: Din Rail Terminal Board - RTD
Span: 0.3532 to 4.054 V
Maximum lead resistance: 15 ohm maximum two-way cable resistance
Number of channels Eight channels
Country of Manufacture: United States (USA)
Series: Mark VI

Functional Description

IS200DRTDH1A is an RTD input terminal board developed by GE. It is a Part of Mark VI Speedtronic system. The board stands out as a streamlined RTD terminal board tailored specifically for DIN-rail placement, offering a compact design with a range of functionalities. With eight RTD inputs integrated into its framework, it seamlessly links to the VRTD processor board via a single cable. Interestingly, this cable mirrors the ones utilized in the larger TRTD terminal board, ensuring compatibility and ease of integration across different setups.


  • An advantage lies in the vertical stacking capability of these terminal boards on the DIN-rail, presenting an efficient means of optimizing cabinet space. This stacking feature enables multiple boards to be neatly aligned one above the other, conserving valuable cabinet real estate while maintaining a tidy and organized setup.
  • The flexibility extends to scalability, allowing the connection of two DRTD boards to the VRTD processor board, effectively expanding the system's capacity to accommodate a total of 16 temperature inputs. This scalability empowers users with the ability to handle a broader array of temperature monitoring and control tasks within their applications.
  • Presently, only a simplex version of the board is accessible. Nonetheless, its efficient design, compatibility, stackability, and scalability make the DRTD board a reliable and versatile solution for temperature monitoring and management in various industrial or commercial settings.


The installation process of the DRTD board involves a straightforward procedure that ensures secure mounting and efficient wiring for its operation.

  • Firstly, the DRTD board is designed to seamlessly slide into a plastic holder specifically crafted for mounting on the DIN-rail. This mounting mechanism provides a stable and secure placement for the board within the system setup.
  • The eight RTDs (Resistance Temperature Detectors) are directly connected to the Euro-Block type terminal block, which is an integral component permanently affixed to the DRTD board. This terminal block features a total of 36 terminals, facilitating the organized and structured connection of the RTDs. It's noteworthy that typically, #18 AWG wires, specifically shielded twisted triplet cables, are utilized for these connections. This particular wire gauge and shielding are chosen for their ability to efficiently transmit signals while maintaining resistance to interference, ensuring accurate temperature readings.
  • Within the terminal block, terminals 25 through 34 are allocated as spare terminals, providing additional flexibility for potential future expansions or modifications in the system without the need for extensive rewiring.
  • Additionally, particular attention is directed towards the SCOM (ground) connection, which involves two screws dedicated to this purpose. It's emphasized that this ground connection should be as short a distance as feasible. This emphasis on minimizing the length of the ground connection aims to reduce any potential for interference or signal disruption, promoting the stability and reliability of the system's performance.
  • Overall, the installation process of the DRTD board is methodical and efficient, focusing on secure mounting, organized wiring using specified cables, spare terminals for flexibility, and attention to grounding to ensure optimal performance and accuracy in temperature monitoring and control applications.


  • The onboard noise suppression system closely resembles that found on the TRTD. Permanently affixed to the board are high-density Euro-Block type terminal blocks, featuring two screw connections dedicated to the ground connection (SCOM). An onboard identification chip serves the purpose of identifying the board to the VRTD, aiding in system diagnostics when necessary.
  • For the functionality of the terminal board, it supplies a 10 mA dc multiplexed excitation current to each RTD, allowing for both grounded and ungrounded configurations. Remarkably, the eight RTDs can be positioned up to 300 meters (984 feet) away from the turbine control cabinet, provided the two-way cable resistance does not exceed 15 ohm.
  • The RTD inputs and their signal processing are depicted in an accompanying figure. Within the VRTD board, the VCO type A/D converter utilizes voltage-to-frequency converters and sampling counters. This converter samples each signal and the excitation current at a rate of four times per second in normal mode scanning and 25 times per second in fast mode scanning, synchronizing with the power system frequency.
  • The software-driven digital signal processor is responsible for the linearization of 15 RTD types, offering flexibility in selection. Detection of RTD open and short circuits is facilitated by monitoring for values that fall outside the expected range. To safeguard other input channels, an RTD exhibiting hardware limit discrepancies is temporarily removed from the scanned inputs. These channels are automatically reactivated after a 20-second interval, or alternatively, can be manually reinstated.
  • Overall, this comprehensive setup ensures effective noise suppression, robust identification, precise signal processing, and proactive measures for RTD anomalies, thereby enhancing the reliability and performance of the system in diverse monitoring and control scenarios.

WOC professionals are always available to assist you with your Mark VI requirements. Please contact WOC for more information.

Frequently Asked Questions


What is IS200DRTDH1A?
It is an RTD input terminal board developed by GE.

How many RTD inputs does the DRTD board have?
The board features eight RTD inputs, allowing for the monitoring of eight different temperature points.

How does the board connect to the VRTD processor board?
It connects to the VRTD processor board using a single cable. Interestingly, this cable is identical to the ones used on the larger TRTD terminal board, ensuring compatibility across systems.

Can multiple boards be used together?
Yes, the terminal boards can be vertically stacked on the DIN-rail to save cabinet space. Additionally, two boards can be connected to the VRTD, expanding the system's capacity to monitor up to 16 temperature inputs.

Is there more than one version of the board available?
Presently, only a simplex version of the board is available, providing a straightforward and efficient solution for temperature monitoring applications.