IS230TRTDH1D - RTD Input Terminal Board

IS230TRTDH1D - RTD Input Terminal Board IS230TRTDH1D - RTD Input Terminal Board

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Part No.: IS230TRTDH1D
Manufacturer: General Electric
Function: RTD Input terminal board
Number of channels: Eight channels
Maximum lead resistance: 15 ohm
Span: 0.3532 - 4.054 V
Country of Manufacture: United States (USA)
Product Type: PCB
Availability: In stock
Series: Mark VIe

Functional Description

IS230TRTDH1D is a RTD Input terminal board developed by GE. The board supports 16 three-wire RTD inputs. These inputs are connected to two barrier terminal blocks. Surge and high frequency noise are protected by noise suppression circuitry in the inputs. TRTD communicates with one or more I/O processors, which convert the analog temperature inputs to digital temperature values and send them to the controller. It is a simplex board with two DC-type connectors for PRTD, normal scan. The board has no jumpers or hardware settings. It is a simplex board that does not support TMR. Three LEDs at the top of the VRTD front panel indicate status. The normal RUN condition is a flashing green, while the FAIL condition is a solid red. The third LED is normally off, but displays a steady orange if the board has a diagnostic alarm condition.

Product Features

  • This is a small board component that interacts with a PRTD board. There are 16 three-wire RTD inputs on the board. These inputs are accepted by two terminal blocks located on the board's front edge. To protect against surges and high-frequency noise, each input has noise suppression.
  • It is one of four TRTD board versions; please confirm before ordering that this is the correct board for your needs.
  • The board's two terminal blocks are barrier type blocks. They can be unplugged from the board for maintenance purposes. Each input has 24 screw connections and can accept up to eight RTD inputs via three wires. Two DC-37 pin connectors with latching fasteners are provided on the board. These ports are identified as JA1 and JB1.
  • The board is attached to a metal frame by two screws. This frame shields the board's four edges and includes a shield bar along the leading edge.
  • RTD inputs are automatically calibrated using the filtered calibration source and null voltages.
  • There are no jumpers or hardware settings on the module


  • Connect the wires for the 16 RTDs to the terminal board's two terminal blocks.
  • Each block is held together with two screws and has 24 terminals that accept wires up to #12 AWG.
  • To the left of each terminal block is a shield terminal strip connected to chassis ground.


  • Each RTD, which can be grounded or ungrounded, receives a 10 mA dc multiplexed (not continuous) excitation current from the terminal board. With a maximum two-way cable resistance of 15, the 16 RTDs can be located up to 300 m (984 ft) from the turbine control cabinet.
  • The I/O processor board's A/D converter samples each signal and excitation current four times per second for normal mode scanning and 25 times per second for fast mode scanning, with a time sample interval related to the power system frequency. Linearization is performed in software for the selection of 15 RTD types. Out-of-range values detect RTD open and short circuits.
  • To avoid adverse effects on other input channels, an RTD that is determined to be outside of hardware limits is removed from the scanned inputs. Repaired channels are automatically reinstated after 20 seconds, or they can be manually reinstated. At signal entry, all RTD signals have high-frequency decoupling to ground. The I/O processor's RTD multiplexing is coordinated by redundant pacemakers, so that the loss of a single cable or I/O processor does not result in the loss of any RTD signals in the control database.
  • VRTD boards in R, S, and T of a Mark VI TMR system read RTDs simultaneously, but skewed by two RTDs, so that when R is reading RTD3, S is reading RTD5, and T is reading RTD7, and so on. This prevents the same RTD from being excited by two VRTDs at the same time, resulting in inaccurate readings.

Product Attributes

  • Maximum lead resistance: 15 ohm maximum two-way cable resistance
  • Number of channels: Eight channels per terminal board
  • RTD types: 10, 100, and 200 ohm platinum, 10 ohm copper, 120 ohm nickel
  • Fault detection: High/low (hardware) limit check, High/low (software) system limit check, Failed ID chip
  • Configuration: There are no jumpers or hardware settings on the board.
  • Calibration: inputs are automatically calibrated using filtered calibration source and null voltages.

World of Controls has the most comprehensive collection of GE Mark VIe components. Please contact WOC as soon as possible if you require any extra information.


Frequently Asked Questions


What is IS230TRTDH1D?
It is a RTD Input terminal board developed by GE

What is the range of the span on this product?
The span range on this product is 0.3532 to 4.054 V.

What is the maximum lead resistance for this product?
The maximum lead resistance for this product is 15 ohms for two-way cable resistance.

How many channels does each terminal board have?
Each terminal board on this product has eight channels.