The FI021B is a digital module designed for electrical installation and automation systems. It features electronics data supporting its operation within various control configurations. The module does not include a switchable terminating resistor of 120 ohms, which must be connected externally for bus termination between specified terminals. It can be configured with different interface options, such as PROFIBUS, and is compatible with other modules like analog interfaces. The FI021B is part of a range of modules intended to upgrade and expand automation system capabilities, providing reliable digital communication and integration within industrial control environments.

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