Allen-Bradley 1747-L541 SLC 500 PLC Processor

Allen-Bradley 1747-L541 is a SLC 5/04 CPU Processor for the SLC 500 modular controller family, delivering 16,000 words of user memory and supporting up to three I/O chassis with up to 30 local module slots for scalable control of discrete and sequential processes. It provides DH+ and RS-232 serial communications for legacy network connectivity, enabling integration with older Allen-Bradley devices and field equipment. The processor targets compact to mid-size applications with a program scan time of about 0.9 milliseconds and an I/O scan time of roughly 0.225 milliseconds per keyword, addressing 4,096 input words and 4,096 output words, suitable for straightforward control tasks. Power characteristics specify a current draw of 1.0 A at 5 V DC and 200 mA at 24 V DC, reflecting typical installation conditions in panel-mounted SLC 500 systems. This CPU is designed for reliable operation in legacy automation environments, where compact hardware with DH+ and RS-232 connectivity supports simple machine control, sequencing, and data collection tasks without migrating to newer protocols.