IS230TNRLH1E - Relay Output Assembly

IS230TNRLH1E - Relay Output Assembly IS230TNRLH1E - Relay Output Assembly

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Part Number: IS230TNRLH1E
Manufacturer: General Electric
Series: Mark VIe
Function: Relay Output Assembly
Size: 17.8 cm wide x 33.02 cm high
Temperature: -30 to + 65 degrees Celsius
Technology: Surface-mount
Availability: In Stock
Country of Manufacture: United States (USA)

Functional Description

IS230TNRLH1E is a Relay Output Assembly manufactured and designed by General Electric. It is a part of the Mark VIe Control System. The board is intended for DIN-rail or flat installation. The board accepts 24 group isolated contact inputs from an external source with a nominal 24, 48, or 125 V dc wetting voltage. To protect against surge and high-frequency noise, the contact inputs have noise suppression. It has 12 form-C relay outputs and can accept various option cards to expand relay functions.


  • Wetting Voltage Calibration: The product is calibrated to work with three different wetting voltages: 24 V dc, 48 V dc, and 125 V dc. This calibration ensures that the product operates optimally and accurately when connected to circuits with these specific voltage levels.
  • Input Wetting Voltage Ranges: The input wetting voltage ranges determine the acceptable voltage levels for reliable operation. The product has different ranges for different wetting voltages. For example, for a wetting voltage of 24 V dc, the input wetting voltage range is 16 to 32 V dc. Similarly, for a wetting voltage of 48 V dc, the range is 32 to 64 V dc, and for a wetting voltage of 125 V dc, the range is 100 to 145 V dc.
  • Threshold Voltage: The threshold voltage is an important parameter for the product's operation. It is set at half of the wetting voltage. The threshold voltage acts as a reference point for determining the ON/OFF state of the input signals and plays a role in signal detection and processing.
  • Contact Input Current Limitation: The product imposes specific limits on the contact input currents to ensure safe and proper operation. The first 21 circuits have a current limit of 2.5 mA, while circuits 22 to 24 can handle currents up to 10 mA. These current limitations protect the circuits from excessive current flow and potential damage.
  • Current Limitation on 24 V DC Supply: The product's 24 V dc supply is equipped with resetting polymer positive temperature coefficient (PTC) fuses that limit the current to 0.5 A. These fuses ensure that the supply remains protected and prevent excessive current draw, thereby maintaining safe operation.
  • Input Filters and Surge Suppression: Each input of the product is equipped with filters near the point of signal entry. These filters serve multiple purposes: they reduce high-frequency noise, suppress voltage surges, and help maintain signal integrity by filtering out unwanted interference. By implementing these filters, the product ensures reliable and accurate signal processing.
  • I/O Processor and Optical Isolation: The discrete input voltage signals are routed to the I/O processor within the product. The I/O processor converts these analog signals into digital signals, which are then transmitted to the controller. To ensure electrical isolation and prevent interference, the signals are transmitted via optical isolators. This isolation mechanism protects the controller and ensures the integrity of the signals during transmission.

Product Attributes

  • Input Filter: The product features a hardware filter with a response time of 4 ms. This filter ensures that only the desired input signals are processed, while filtering out unwanted noise or interference.
  • Fault Detection in I/O Board: The product includes a comprehensive fault detection system for the input/output (I/O) board. It can detect two specific types of faults: loss of contact input wetting voltage and non-responding contact input in test mode. These detection mechanisms help ensure the reliability and proper functioning of the I/O board.
  • AC Voltage Rejection: The product is designed to reject AC voltage interference effectively. It can withstand up to 12 V rms of AC voltage when operating with a 24 Vdc wetting voltage. This feature helps maintain signal integrity in environments where AC voltage fluctuations or noise may be present.
  • Number of Relay Channels: The product offers 12 relay channels, allowing for the control or switching of various electrical circuits. Each relay channel can be independently controlled and used to connect or disconnect electrical loads as needed.
  • Rated Voltage on Relay Contacts: The relay contacts are designed to handle different nominal voltages based on the application requirements. The product supports three DC voltage options: 24 V dc, 48 V dc, or 125 V dc. Additionally, it supports two AC voltage options: nominal 120 V ac or 240 V ac. These different voltage ratings allow the product to be compatible with a wide range of electrical systems and configurations.


  • Each analog input has high/low (hardware) limit checking. These limits are not programmable and are chosen to be outside of the normal operating range but within the linear hardware operational range (before the hardware reaches saturation).
  • The software maintenance tools provide access to diagnostic messages for hardware limit checks and all other hardware diagnostics for the board. Each I/O pack has a composite diagnostic alarm state in the database, as well as a separate logic state to indicate a high/low (hardware) limit fault of any analog input or the associated communications for that signal.
  • Diagnostic and system (process) alarms are recorded in the controller and sent to the operator and maintenance stations. Communication links to a plant's distributed control system (DCS) can carry both software (system) and composite hardware diagnostics.

WOC is happy to assist you with any of your automation requirements. For pricing and availability on any parts and repairs contact us.


What is IS230TNRLH1E?
It is a Relay Output Assembly manufactured and designed by General Electric

What type of installation is the board intended for?
It is designed for DIN-rail or flat installation, providing flexibility in mounting options for various applications.

What are the voltage specifications for the contact inputs?
The board accepts 24 group isolated contact inputs from an external source with a nominal 24, 48, or 125 V dc wetting voltage. The board is calibrated for wetting voltages of 24, 48, and 125 V dc.

How are surge and high-frequency noise suppressed in the contact inputs of the board?
To protect against surge and high-frequency noise, the contact inputs are equipped with noise suppression mechanisms. These mechanisms help maintain signal integrity and ensure reliable operation.