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SKU 2177367  UPC 0257360965351

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Product Description

The IC660BSM021 is a Genius I/O Bus Switching Module (BSM) used to connect input/output devices to two serial buses simultaneously. IC660BSM021 exists in two versions, the 115 VAC/125 VDC BSM catalogued as IC660BSM120 and the 24/48 VDC BSM catalogued as IC660BSM021. Version IC660BSM021 BSM is capable of connecting a maximum of eight discrete and analog blocks to a dual bus. Version IC660BSM021 is also capable of permitting up to 30 I/O blocks to interface to the same dual bus if additional BSMs are used. This type of dual bus configuration provides a backup communications path that can be used in case of bus failure. Each bus from the dual bus pair is coupled with a bus controller or PCIM. The system may also support CPU redundancy if each bus interface module is residing in a different CPU.

The phase B discrete block in the cluster controls all operations of IC660BSM021. The first circuit an output dedicated to the IC660BSM021 BSM. This particular output makes it possible to switch buses every time communication is lost on the current bus. If an operational bus cannot be found with one switch of the IC660BSM021, the BSM must then wait for communication to be restored on the connected bus, or until power can be cycled to the BSM controller block. This prevents unnecessary switching. De-energized, the IC660BSM021 connects the blocks to bus A. IC660BSM021 BSM becomes energized only when selection of bus B is required. The LED on the IC660BSM021 is lit when bus B is active. IC660BSM021 BSM can also be commanded to switch buses using the CPU or handheld monitor. IC660BSM021 and IC660BSM120 are identical except for power source.  IC660BSM021 is powered by 24/48VDC, while IC660BSM120 is powered by 115 VAC/l25 VDC.

 The final letter in the part number (ex. IC660BSM021K) indicates the revision. Revision K or later use the newer style electronic housing and therefore needs the newer style plastic door and may indicate some compatibility issues with the terminal strip.

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