Each module must consist of subdevices. The subdevice is a virtual representation of the working area of ​​a physical device. Many devices support multiple workgroups with the same functionality. Each workgroup may be in a separate zone. To fully control the zone, you need to create a subdevice for each workgroup of the device. For example, a 6-channel HDL dimmer contains 6 dimmable channels, through which 6 working groups can be controlled. Therefore, it is advisable to select in the module 6 subdevices for the possibility of creating actions, events and conditions for each workgroup separately. The presence of subdevice in the i3 lite module is obligatory. The number of sub-devices can be from one to many. Usually the number of subdevice is equal to the number of channels of the controller, the number of its work areas or logical devices.