Logical Addressing

With logical addressing, slaves are not addressed individually. Instead, a section of the segment-wide logical address space (data) is allocated to each salve. Any number of slaves may use separate, the same or overlapping sections.

The Fieldbus Memory Management Units (FMMU) on the slaves handle the assignment of slave local memory address to logical addresses. With this it is possible to address several slaves with a single PDU.

Examples of a simple logical address mapping