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The Allen-Bradley 1747-L542P is a robust Pro-Set 200 processor designed for the SLC 5/04 system, equipped with 32 kilowords of program memory and capable of supporting up to 8192 discrete digital I/O. It allows for expansion across three chassis with a total of 30 I/O slots and offers on-board communication via RS-232 and DH+ ports. Notable features include a typical scan time of 0.9 milliseconds, flash EPROM memory backup, and status indicators for various system states. It operates at a current draw of 1 Amp at 5 Volts DC and 200 milliamps at 24 Volts DC, meeting NEMA noise immunity standards, with a clock accuracy dependent on temperature and reliable performance within a 0 to 60 degrees Celsius ambient environment.