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SPECIFICATIONS:
Part Number: IS220SRTDH2A
Manufacturer: General Electric
Series: Mark VIe
Product Type: Simplex Contact RTD Input Terminal Board
Number of channels: 8
Analog inputs Current inputs: 4-20 mA
Span: 0.3532
Maximum lead resistance: 15 Ohms
Analog output current: 0-20 mA
Size: 15.9 cm high x 17.8 cm wide
Operating Temperature: -30 to +65°C
Frequency: 50 or 60 Hz
Repair: 3-7 Days
Availability: In Stock
Weight: 2 lbs
Country of Origin: United States
Manual: GEH-6721L
FUNCTIONAL DESCRIPTION:
IS220SRTDH2A is a Simplex Contact RTD Input Terminal Board Manufactured and designed by General Electric as part of the Mark VIe Series used in GE Distributed Turbine Control Systems. The SRTD board is a compact RTD (Resistance Temperature Detector) terminal board designed for accurate temperature measurement and reliable signal interfacing in industrial applications. Engineered for DIN-rail or flat mounting, it provides installation flexibility across a wide range of control and monitoring systems. The board supports eight RTD input channels, allowing multiple sensors to be connected simultaneously for precise and distributed temperature monitoring. Its direct compatibility with PRTD and VRTD I/O processors ensures seamless integration into turbine control systems and other process automation environments.
To optimize wiring efficiency, the SRTD board incorporates high-density Euro-block type terminal connectors, which deliver secure and space-saving connections while simplifying installation and maintenance. An integrated on-board ID chip automatically identifies the board to the connected I/O processor, enabling advanced system diagnostics, configuration recognition, and fault detection. This feature enhances system reliability and reduces troubleshooting time, making the SRTD board a dependable choice for critical temperature measurement and industrial automation requirements.
The PRTD I/O pack is designed to operate in conjunction with the SRTD terminal board to provide precise RTD signal processing for temperature measurement applications. The I/O pack connects directly to the SRTD through a DC-37 pin connector, ensuring secure and efficient signal transfer, while system communication with the controller is established over a high-speed Ethernet network for reliable data exchange. The PRTD I/O pack supports only simplex system configurations, making it suitable for applications where single-channel operation is sufficient, while still maintaining the accuracy, diagnostic capability, and seamless integration required in modern turbine and process control environments.
INSTALLATION:
The SRTD board, along with its plastic insulator, is designed to be mounted on a sheet metal carrier, which can be easily secured to a DIN rail for flexible installation. As an alternative, the SRTD and insulator may be mounted on a sheet metal assembly that can be bolted directly into a cabinet, depending on the system’s configuration requirements. The board accommodates eight RTD sensor inputs, which are wired directly to a Euro-style box-type terminal block featuring 36 terminals and offered in two versions to meet application needs. For wiring, #18 AWG shielded twisted triplet cables are typically used to ensure signal integrity and minimize electrical noise. The I/O cable shield termination is achieved through an external mounting bracket, which may be supplied either by GE or the customer. It should be noted that terminals 25 through 34 are not connected, while the E1 and E2 terminals serve as mounting holes for the chassis ground screw connection (SCOM), providing proper grounding and system safety.
DIAGNOSTICS:
The PRTD front panel features three LED indicators that provide operating status and diagnostic feedback: a flashing green RUN LED confirms normal operation, a solid red FAIL LED indicates a fault requiring immediate attention, and a steady orange Diagnostic Alarm LED (normally off) signals the presence of a diagnostic issue. To ensure reliability, the board applies two levels of continuous monitoring: hardware limit checking, which validates that input signals stay within safe physical ranges, and system limit checking, which verifies that values remain within expected process parameters. These layered diagnostics provide early warning of abnormalities, helping prevent failures and maintain stable system performance.
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 00 input’s hardware limits is set, it creates a composite diagnostic alarm, L3DIAG_PRTD, referring to the entire board. 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. These limits can be used to generate alarms, and can be configured for enable/disable, and as latching/non-latching. RESET_SYS resets the out-of-limit signals. In TMR systems, limit logic signals are voted, and the resulting composite diagnostic is present in each controller.
Each connector has its 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 J00 connector location. If a mismatch is encountered, a hardware incompatibility fault is created.
World of Controls maintains the largest inventory of replacement parts for GE Distributed Turbine Control Systems, ensuring quick access to critical components when you need them most. In addition to our extensive stock, we provide expert repair services for faulty boards, restoring them to full functionality and helping you extend the life of your equipment. WOC can also supply both unused and professionally rebuilt parts, each backed by a comprehensive warranty for your peace of mind.
Our dedicated team of automation and turbine control specialists is available 24/7 to provide technical support and guidance, ensuring minimal downtime and maximum system reliability. Whether you require OEM replacement parts, urgent board repairs, or expert assistance with complex automation requirements, WOC is your trusted partner. For pricing, availability, or technical consultation, please contact our team by phone or email. We are always ready to support your operational needs.
What is the purpose of the Simplex Contact RTD Input Terminal Board?
The RTD Input Terminal Board is designed to interface resistance temperature detectors (RTDs) with control systems, allowing accurate temperature measurement. It converts the resistance signals from RTDs into electrical signals readable by the Distributed Control System (DCS). This ensures precise monitoring and control of turbine or industrial processes.
How many RTDs can be connected to the board?
The board typically supports up to eight RTDs. Each RTD connects to a dedicated terminal, allowing multiple temperature points to be monitored simultaneously. This configuration simplifies wiring and reduces the need for additional signal conditioning.
What type of wiring is recommended for connecting RTDs?
Shielded twisted triplet wires, usually #18 AWG, are recommended to minimize electrical noise and signal interference. Proper grounding of the shield ensures reliable readings. This setup maintains signal integrity over long cable runs.
