Description of AttributesThe category appears only when you select a slave device in the Fieldbus Editor. Attribute Description Logical Number For PROFIBUS devices: Address of the device on the bus. Range: 0 to 126. 1 is reserved and cannot be used. Read-only. For HART devices: Channel number of the module. Range: 0 to x-1 (where x is the number of channels that the module is equipped with).