In a power-up sequence, the •••CRA312•0 remote I/O adapter module performs a complete reconfiguration. (There is no backup memory in the •••CRA312•0 adapter module for saving the configuration.)

A warm start occurs when, after a condition-generated shutdown, the system resumes and the programs running on that system continue at the point they were at when the shutdown occurred. No data is lost in a warm start as long as the Quantum PLC contains a valid configuration. When a warm start occurs in RUN mode, there is no requirement to re-execute the application program, even if there are detected errors on the remote I/O system (the 140CRP31200 remote I/O head module, the •••CRA312•0 adapter module, or I/O modules are absent or inoperable).

After the 140CRP31200 head module restarts, it reads from the CPU memory to get the configuration of all remote I/O drops declared in the Control Expert configuration. The •••CRA312•0 adapter modules get the latest configuration.