SPECIFICATIONS
Part No.: IC660BSM021
Manufacturer: General Electric
Product Type: Genius I/O Bus Switching Module
Availability: In Stock
Operating Voltage: 24/48VDC
Series: VersaMax
Functional Description
IC660BSM021 is a Genius I/O Bus Switching Module developed by GE Fanuc. It is a Bus Switching Module (BSM) within the GE Fanuc Genius I/O system, designed to facilitate the connection of input/output (I/O) devices to two independent serial buses simultaneously. This dual-bus setup is integral in creating a redundant communication pathway, ensuring that the system can maintain operation even if one of the buses fails.
Versions and Compatibility
- BSM021: This version operates on a 24/48 VDC power supply. It is ideal for systems that rely on lower voltage DC power, which is common in many industrial environments.
- BSM120: This version operates on a 115 VAC/125 VDC power supply, making it suitable for installations that require alternating current or higher voltage DC inputs.
Both versions are functionally identical in terms of performance and operation, with the only difference being their respective power supply requirements. This flexibility allows the modules to be easily integrated into a wide range of industrial control systems.
Connectivity and Capacity
- It is designed for scalability, making it highly adaptable to both small and large industrial setups. In its basic configuration, the module can connect up to eight discrete and analog blocks to a dual-bus system. This makes it a practical solution for applications requiring precise control and monitoring of multiple devices.
- For larger systems, the module offers even greater scalability. By incorporating additional bus switching modules (BSMs), the system can interface with up to 30 I/O blocks. This high-capacity design ensures robust and reliable communication across multiple devices.
Dual Bus Configuration and Redundancy
- Dual-bus configuration, which provides redundancy for critical industrial processes. The system is designed so that each bus is linked to a bus controller or a Programmable Communication Interface Module (PCIM).
- In the event of a failure on the primary bus, the system automatically switches to the secondary bus, ensuring continuous operation without interruption. This dual-bus architecture also supports CPU redundancy by placing the bus interface modules in separate CPUs, further enhancing the system’s fault tolerance and reliability. By implementing this redundant communication path, minimizes the risk of downtime in mission-critical applications, such as power generation and process control.
Operation and Switching Mechanism
- The operation is controlled by a phase B discrete block within the system cluster, which governs the switching process between buses. The module’s first circuit is dedicated to detecting communication loss on the active bus and initiating a switch to the secondary bus. If switching does not restore communication, the module remains connected to the last operational bus, avoiding unnecessary switching that could disrupt system stability.
- In its default state (de-energized), the module connects the blocks to bus A. When a switch to bus B is required, the module energizes and shifts communication to the secondary bus. An LED indicator on the module lights up when bus B is active, providing a visual cue for operators to monitor the system’s status easily.
- For additional flexibility, the bus switching process can be manually commanded through the system’s CPU or via a handheld monitor. This manual option allows system operators to take direct control of the switching process when necessary, ensuring that the system remains under control even in dynamic or unforeseen conditions.
Installation Procedure
- Preparation of the Block: Before beginning the installation, ensure that the power is turned off to prevent any electrical hazards. Identify the phase B block where the BSM will be mounted. This block must have the necessary output circuit to control the BSM effectively.
- Grounding the Block: Locate the grounding screw situated at the top left side of the block, which is positioned behind the bus connection terminals. Remove this screw carefully. Use the grounding screw located in the lower ground position to establish a secure ground for the block, ensuring proper electrical grounding to prevent any potential faults.
- Loosening Terminal Screws: Next, loosen the screws for the Serial 1 and 2 connections, as well as the Shield In and Out terminals on the controller block. This step is necessary to prepare the block for the BSM connectors, allowing for a secure connection.
- Inserting BSM Connectors: Take the BSM connectors and insert them under the loosened terminal screws. Make sure that the connectors are properly aligned and securely positioned to ensure a reliable electrical connection.
- Mounting the BSM: Using a 10-32 x 1/2 pan-head screw along with a matching lock washer, bolt the BSM to the upper grounding hole on the phase B block. This step ensures that the BSM is firmly attached to the controller block, providing stability and support during operation.
- Finalizing Connections: Do not tighten the terminal screws until all bus stub wiring is completed. This precaution allows for adjustments if needed and ensures a proper fit without straining the connections. Once the wiring for the bus stubs is completed, connect the BSM as a load to circuit 1 on the block. For precise wiring information and configuration details, refer to the block’s data sheet. This resource provides essential specifications and diagrams to facilitate accurate connections.
- Testing and Verification: After completing the installation and connections, it is crucial to conduct a thorough testing procedure to verify that the BSM operates correctly within the system. Check for any loose connections, ensure that the grounding is secure, and confirm that the BSM is properly controlling the load as intended.
Board Removal
- Disconnecting Power: Ensure that the power to the block and the associated systems is completely shut off. This step is crucial to avoid any risk of electric shock or equipment malfunction during the removal process.
- Removing the Pigtail Cable: If it is absolutely necessary to remove the BSM without powering down the block (although this is not recommended), the first step is to disconnect the BSM’s pigtail cable from the block. The pigtail cable carries either 115VAC/125VDC or 24/48VDC power, and safely disconnecting it is vital for a secure removal.
- Using Insulated Tools: Utilize an insulated screwdriver to carefully disconnect the pigtail wires from the block terminals. Insulated tools are essential for ensuring safety when working with live electrical connections. Take care to avoid short-circuiting any terminals during the disconnection process.
- Labeling Wires: It is advisable to label the wires before disconnecting them, especially if there are multiple connections. This labeling will assist in correctly reconnecting the BSM or any other component during reinstallation.
- Removing the BSM: Once the pigtail cable has been safely disconnected, carefully remove the BSM from its mounted position on the block. Ensure that no other components are disturbed during this process, as maintaining the integrity of surrounding parts is important.
The WOC team is always available to help you with your Mark I and II requirements. For more information, please contact WOC.
Frequently Asked Questions
What is IC660BSM021?
It is a Genius I/O Bus Switching Module developed by GE under VersaMax series.
Can the module support CPU redundancy?
Yes, the system can support CPU redundancy if each bus interface module is connected to a different CPU.
How is the module configured?
The module is configured using the phase B discrete block within the system cluster. It also features an LED indicator for visual status and can be manually commanded via the CPU or handheld monitor.
What should be considered when installing the module?
The module should be installed in a clean area free of airborne contaminants, with adequate cooling and airflow. Proper grounding is also essential to ensure reliable operation.
