Translations:WB-MRM2-mini Modbus Relay Modules/7/en

Inputs

Closed input in trigger mode may be unstable

The screw-free terminals b1 and b2 of the module have 2 inputs of the dry contact type, not isolated from the power supply. RC chains are used on each input line to eliminate contact chatter. The inputs are pulled up by resistors to the +3.3 V power line. Buttons or switches with locking are connected between the GND pin and the corresponding b1 or b2 input. The inputs can be used as general-purpose inputs, for counting signals and for direct control of relay channels.