Chapter 11 DeviceNet Remote I/O Module AHRTU-DNET 11.4.3.3 Allocation of the Mapping Addresses for the Modules There are two forms of data mapping for each module. When the DeviceNet master has not allocated the input and output mapping starting addresses to AHRTU-DNET-5A, the value in “Start Address” as below represents the offset based on the input or output mapping starting address that the DeviceNet master allocates to AHRTU-DNET-5A. When the DeviceNet master has allocated the input and output mapping starting addresses to AHRTU-DNET-5A, the value in “Start Address” as below represents the mapping starting address of the module.
When AHRTU-DNET-5A is pulled to “Scan List” on the Scanner Module Configuration interface, the DeviceNet master will allocate the input and output mapping starting addresses to AHRTU-DNET-5A. If AHRTU-DNET-5A is removed from “Scan List” on the Scanner Module Configuration interface, the input and output mapping starting addresses will be unknown. When the DeviceNet master has not allocated the input and output mapping starting addresses to AHRTU-DNET-5A, the value in “Start Address” is set to 1, which means that the starting address of the module is the offset ##+1 based on the input or output mapping starting addresses which the DeviceNet master has allocated to AHRTU-DNET-5A.
When the input starting address that the DeviceNet master allocates to AHRTU-DNET-5A is D1005 and the value in “Start Address” is set to 1006, it means that the input starting address of the module is D1006. If AHRTU-DNET-5A is pulled out of the DeviceNet master configuration, that is, the DeviceNet master does not allocate the mapping starting address to AHRTU-DNET-5A, the starting address of the module will become the offset ##+1 based the input or output mapping starting address that the DeviceNet master allocates to AHRTU-DNET-5A. 11-53