1PC Allen Bradley 1747-L542 SLC 500 CPU Processor Unit

About1747-L542

This processor is built with status indicators such as Run, CPU Fault, Forced I/O, Battery Low, RS-232 and DH+ LEDs. It is also provided with a key for switching the processor’s operating mode. This operating mode may be switched through the provided key or via the software. If modifications are needed, the hardware key must be set to REM to allow full software control. The Allen-Bradley 1747-L542 is an SLC 500 SLC 5/04 modular processing unit that has the capacity to handle 32K words, specifically 4K data storage and 28K words for program data. It has an absolute maximum of 4096 discrete inputs and 4096 discrete outputs, with 480 maximum local analog I/O. The 1747-L542 also has a maximum of 3 local I/O chassis, with a maximum of 30 slots in the local I/O chassis. Its I/O scan time is 0.255 milliseconds, typical program scan time is 0.9 milliseconds/Kword, and bit execution time is 0.37 milliseconds, with a program scan holdup time of 20 milliseconds to 3 seconds after a power loss.

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