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Part No.: IC660BSM021D
Manufacturer: General Electric
Country of Manufacture: United States of America (USA)
Operating temperature: 0o C to +6oC
Storage temperature: -40o to +100o C
Humidity: 5% to 95% (non-condensing)
Product Type: Bus Switching Module
Availability: In Stock
Series: Mark I and II
IC660BSM021D is a Bus Switching Module developed by GE. It is part of the Mark I and II control system. Serving as a Bus Switching Module (BSM) that ensures reliable and continuous communication between input and output devices within a dual-bus configuration. It connects devices to two separate serial buses, providing a redundant communication pathway to ensure uninterrupted system operation. If one bus fails, the system can switch to the other, minimizing downtime and ensuring continuous functionality. It is powered by a 24/48 VDC power source, ideal for systems that require this voltage range.
It is designed to support up to eight discrete and analog blocks connected to a dual bus. This provides the flexibility needed for many industrial applications, where multiple devices need to communicate simultaneously. For larger or more complex systems, users can connect up to 30 I/O blocks by incorporating additional BSM modules, allowing the system to scale according to the demands of the application.
The module allows for a dual bus setup, providing a backup communication path in case one of the buses encounters a failure. If the primary bus loses communication, the module will automatically switch to the secondary bus, preventing communication disruption. This redundancy is crucial for critical systems that cannot afford to experience downtime, such as in industrial control systems, energy facilities, and other mission-critical environments.
The dual bus setup works in tandem with bus controllers or PCIMs (Process Communication Interface Modules), which manage the flow of communication between devices and the buses. Supports CPU redundancy, allowing for higher reliability in systems that require two CPUs, each interfacing with one of the buses. This ensures that even in the event of a CPU failure, the system can continue functioning without loss of communication.
The Phase B discrete block within the system manages the operations. It monitors communication activity on both buses and determines when a switch is necessary. If a bus fails, the system automatically switches to the backup bus. However, to prevent unnecessary switching, the module waits until the communication is restored on the current bus, or until the system is reset by cycling the power to the BSM controller block. This logic helps maintain system stability by avoiding constant, disruptive switching attempts.
When the module is not energized, the system defaults to bus A. The module becomes active when a switch to bus B is required. The module features an LED indicator that lights up when bus B is active, allowing users to quickly identify which bus is in use at any given time. This feature provides clear and easy-to-read status updates for operators monitoring the system.
In addition to automatic bus switching, it can also be manually commanded to switch between buses using either the CPU or a handheld monitor. This provides users with more control over the switching process, enabling them to make adjustments as needed based on the operational conditions or troubleshooting requirements.
The module is designed for flexible installation, with the ability to mount in various configurations to suit different system layouts. It can be installed in either right-side-up or upside-down orientations, providing users with greater flexibility depending on available space and system requirements. The module is designed to be mounted using 8-32 screws and includes notches in the upper and lower flanges to align with mounting holes. Star washers should be used during installation to maintain ground integrity.
The dual bus configuration offered is essential for applications that require high availability and fault tolerance. This configuration ensures that communication between devices remains operational even if one of the buses fails, making it ideal for systems where uptime is critical. This capability is particularly important in industries such as energy, manufacturing, oil and gas, and transportation, where even short periods of downtime can result in significant operational and financial losses.
The WOC team is always available to help you with your Mark I and II requirements. For more information, please contact WOC.
What is IC660BSM021D?
It is a Bus Switching Module developed by GE under the Mark I and II series.
How many I/O blocks can the Module support?
It can support up to eight discrete and analog I/O blocks connected to the dual bus. For larger systems, additional BSMs can be added, allowing for up to 30 I/O blocks to interface with the same dual bus configuration.
How does the redundancy feature work in the Module?
The redundancy feature allows for a dual bus configuration, where the system can automatically switch from one bus to another if the primary bus fails. This helps maintain uninterrupted communication in mission-critical systems.
What is the maximum number of I/O blocks the system can support with multiple BSMs?
With the addition of extra modules, the system can support up to 30 I/O blocks connected to a single dual bus, allowing for scalability in larger installations.
