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ModBus module of 24 digital outputs with 18mA leds

It is a compact module with 24 open collector outputs to manage LEDs. The LEDs can be ON or OFF or “blinking” with an 8 bit mask.

Different modules can synchronize between them so as not to make the installation look like a “Christmas Tree”. The process of synchronization consists on reading a Register Input which will carry a synchronizing signal in its answer. For that it will be necessary to configure at least one module with a special address.

Each of the outputs has a current limiting resistor, even though in most cases it will be necessary to externally mount a series resistor in parallel with the LEDs.

The maximum current of each output will be of 100 mA, although all together cannot overcome 1.5 A