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CP-xx (CP-10, CP-11, CP-21) processor modules provide all processing, I/O scanning, logic, control and communications functions required in any of the RTU configurations that may be adopted. The processor module has up to three independent communications ports. Ports 2 and 3 can use plug-in option boards while port 1 is fixed as RS232C.
RTUs may have up to 2 CP-11 modules that can serve up to four backplanes in a hot standby configuration (note one processor should be in an odd numbered backplane slot and the other in an even numbered backplane slot). One processor controls I/O module scanning and communications while the other redundant processor listens.
See also