Chapter 3 PLC System Configuration & Settings When Input and Output Device Range is modified and modules need to be added, the default device address will be based on the last modified device address and skip the used ones for assignment; even though the number in the last modified address is not the biggest, the new module address assignment is still based on the last modification. The following example shows Input Device Range is modified to D50~D57 for Slot No. 2. When a new module is added, the Input Device Range is automatically assigned from the last modified D50~D57 and not based from the system’s biggest D100~D107.
As a result, the Input Device Range of the module is assigned as D58~D65. 3-125