Remove and replace modules in live systems
     Replacement modules configure and
         self-calibrate from system memory
     Quick and easy maintenance
     Minimizes downtime and saves you money

How does it work?
SIXNET I/O modules are microprocessor based. All configuration settings and I/O calibrations are stored digitally in memory that retains your settings, even when power is removed. The secret is that this configuration memory is actually located in the wiring base. When an I/O module is unplugged, its configuration memory remains behind in the "smart wiring" base. Then, when a new module is plugged into the base, it instantly self-configures and calibrates itself with the same span and offset values you expect. The mean time to replace a suspected faulty module is reduced to mere seconds!

Also check out:
     Field Wiring Advantages
     "Process Quality" I/O vs PLC I/O