Reading the Configuration
At the end of the application download, the Quantum CPU configures all modules on the . The 140CRP31200 remote I/O head module reads from the CPU memory to get the configuration of all the declared in the Control Expert configuration. The configuration of the remote I/O drops is used to configure the server in the 140CRP31200 module.
At power up, each •••CRA312•0 remote I/O adapter module gets an from the 140CRP31200 module’s server, then it reads its configuration from the FDR server in the 140CRP31200 module. Finally, the 140CRP31200 module initializes the configured I/O modules in the rack.
NOTE: Verify that the IP addresses of all distributed I/O devices are correct and unique before initial start.
NOTE: If the •••CRA312•0 adapter module is powered up first, the IP address is derived from the MAC address printed on the front of the module. The adapter module then performs checks to see if a DHCP server becomes available to distribute an IP address.
Before receiving a RUN command from the PLC, all remote I/O drops are configured and connected to the 140CRP31200 module. The RUN LEDs on the •••CRA312•0 adapter modules blink to indicate that the PLC is in the STOP state. In the remote I/O drops, the physical outputs remain in the fallback state (output forced to 0). Input values in the CPU memory image are interpreted as 0.
When the PLC is in RUN state, all remote I/O drops change from the STOP to the RUN state. The LEDs on the •••CRA312•0 adapter module indicate this change. Output data received from the CPU are applied to physical outputs. Input images in the CPU are updated with physical inputs.
NOTE: For local I/O in the CPU or extended rack and for , there is no change in the comparison with previous versions of PLCs.
