Most Modbus IO devices deliver digital inputs and outputs as registers rather than as coils. EcoStruxure Automation Expert (EAE) provides Modbus functions to exchange Modbus registers and they are declared in EAE as REAL or INT but not yet as Boolean signals. So here are two Composites that extend the current functionality. They allow to connect up to 16 Boolean IO to exchange them with Modbus registers. Each Composite provides its own connection link to the Modbus side. The Composites include to Basic blocks that need to be imported first. Feel free to make use of and to extend or modify.