SPECIFICATIONS
Part No.: IS200SCLTH1ABB
Manufacturer: General Electric
Country of Manufacture: United States of America (USA)
Size: 6.25 inch x 7 .00 inch
Temperature: -30 to 65oC (-22 to 149 oF)
Technology: Surface mount
Interface: With SCLS and field wires
Fault detection: Incorrect ID chip
Product Type: Core Analog Terminal Board
Availability: In Stock
Series: Mark VIe
Functional Description
IS200SCLTH1ABB is a Core Analog Terminal Board developed by GE. It is a part of the Mark VIe control system. It serves as an interface expansion module, providing additional analog input/output (I/O) terminal points that extend the capability of the PCLA (Process Control Logic Assembly) module. The primary function of the SCLT terminal board is to facilitate the connection and conditioning of analog signals from the field to the Mark VIe controller via the PCLA module. It supports both the reception of multiple analog input signals and the transmission of analog output signals. The board is engineered to accommodate complex signal voting schemes where input signals can be fanned out to one or up to three PCLA modules, enhancing system redundancy and reliability. Likewise, it supports voted analog output signals, ensuring stable and accurate process control outputs.
Input and Output Signal Types
- Thermocouple Inputs: The board supports eight thermocouple inputs, allowing direct interface with various thermocouple types used in temperature measurement. Each thermocouple input is designed to maintain signal integrity and reduce noise, providing accurate thermal readings crucial for process monitoring.
- Analog Voltage/Current Inputs: It provides four analog inputs configurable for either voltage or current signals. These inputs accommodate standard industrial ranges and are suitable for sensors transmitting signals such as 0-10 V or 4-20 mA.
- Analog Outputs: The board offers six 4-20 mA analog output channels, enabling control commands or processed signals to be sent to external field devices such as valves, actuators, or recording instruments.
Operation of the Core Analog Terminal Board (SCLT)
- The terminal board plays a critical role in the analog signal interface architecture within the Mark VIe control system by providing reliable fanning of analog input signals to one or more PCLA modules. This fanning functionality is essential for achieving redundancy and fault tolerance in high-availability control system configurations.
- Input signals connected to the SCLT are passively fanned out to one or up to three PCLA modules, enabling multiple redundant signal paths. This design utilizes high-reliability passive circuitry such as diode logic and buffer elements to ensure signal integrity and prevent single-point failures. This passive approach eliminates the need for active switching components, reducing complexity and enhancing system robustness in redundant control architectures.
- The SCLT terminal board receives its 28 V DC supply from the connected PCLA modules. Given the potential for multiple PCLA modules supplying power, the SCLT employs a Diode-OR configuration to combine these power inputs safely and effectively. This diode-based logic ensures that if one PCLA power source fails, others can seamlessly maintain power to the terminal board, thus supporting redundant power input and enhancing overall system reliability.
- Each of the 24 V DC output branches derived from this power supply is regulated independently via dedicated voltage regulators embedded within the SCLT. These regulators provide consistent voltage levels for powering connected field devices and transmitters. Importantly, each voltage regulator integrates a thermal shutdown feature, protecting the circuit branch from overcurrent and overheating conditions, which could otherwise compromise system safety and functionality.
Connectors and Field Wiring Interface
- Customer Terminals and 68-pin Connectors: These connectors interface with the SCLS terminal board cable, which links the SCLT board to other components within the Mark VIe I/O assembly. The 68-pin connectors support robust, high-density wiring for signal transmission and power.
- Field Wiring Terminals: The board includes forty-eight pluggable Euro-style box terminals, which serve as convenient and secure termination points for field wiring. This design facilitates straightforward installation, troubleshooting, and replacement of field wiring without disrupting the internal circuitry.
The WOC team is always available to help you with your Mark VIe requirements. For more information, please contact WOC.
Frequently Asked Questions
What is IS200SCLTH1ABB?
It is a Core Analog Terminal Board developed by GE under the Mark VIe series.
How does the terminal board support redundancy in the control system?
The board uses high-reliability passive circuitry to fan input signals to one or up to three PCLA modules, ensuring multiple redundant signal paths. Power input redundancy is achieved through a diode-OR arrangement combining 28 V DC supplies from all connected PCLA modules, maintaining uninterrupted power to the board.
What types of analog inputs are supported?
The SCLT board supports eight thermocouple inputs, four configurable analog inputs (voltage or current), and six 4-20 mA analog outputs.
How is power supplied to the analog inputs and outputs?
The board receives 28 V DC power from PCLA modules, which is combined through diode-OR logic for redundancy. The four 4-20 mA analog inputs are powered by an onboard 24 V DC source regulated individually with thermal shutdown for protection.
