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GENERAL The XFL521B, 522B, 523B, and 524B modules are LONMARK compliant digital and analog I/O modules which can be installed at strategic locations within a building. These modules convert sensor readings and provide output signals used for operating actuators via LONWORKS standard network variables (SNVTs). Each Distributed I/O module plugs into a base terminal block allowing communication with controllers via the built-in Echelon® LONWORKS bus interface. The terminal block provides spring clamp terminals for easy connection of field cables from the various sensors and actuators. The modular system allows Distributed I/O modules to be removed from the system without disturbing other modules. The module with terminal block mounts easily onto a DIN rail. When using CARE, the Distributed I/O modules can be automatically bound and commissioned to the Excel 500 CPU (XC5010C, XC5210C, XCL5010) and XL50. When the modules are used by other controllers, provided plug-ins permit the modules to be commissioned by CARE 4.0 or by any LNS network management tool.