The digital output module romod 8 DO eco is a Remote I/O Device which is used to control eight 1-stage motors, or other digital actuators.

The digital MOSFET outputs are provided by the module via terminals. They are ground referenced, +24V DC.
The source voltage for the DOs is also connected via terminals and must be +24 volts (DC). The two supply terminals are connected with each other internally, but not with the 24 V power supply, i.e. there must be applied a source voltage for the outputs in any case.

All digital outputs can be configured so that they will assume a defined state ('safe state') if the module has not received valid bus telegrams via the Modbus for a certain time. These predefined states are set separately for each output, whereas the time until activating the safe state is common for all outputs of a module.
Note: The time for triggering the 'safe state' should not be too short in order to avoid malfunctions as they can occur, e.g., when another device which is connected to the bus fails and will so cause time-outs.

Regarding the system configuration (addressing, maximum number of modules connected to a Modbus Master interface, installation, connection to the bus etc.), please follow the instructions in the chapter Configuration.