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The 1747-L542 is an industrial central processing unit hardware module manufactured by Allen-Bradley under the Rockwell Automation brand with the official product classification of SLC 5/04 Modular Controller. Within the product lineup this hardware belongs to the classic SLC 500 Series programmable logic controller system used to execute ladder logic programming in mid-sized industrial automation control networks.
EtherNet I/P Adapter (1747-AENTR) available to convert an existing system to distributed I/O
Flexible options for Analogue and Digital I/O cards to modify and expand system capabilities
Wide range of replacement power supplies, chassis, communications modules, I/O cards and accessories available
The 1747-L542 module contains a user program memory with a capacity of 32K words and a 1747-BA lithium battery assembly to sustain non-volatile RAM data retention under powered off conditions. In terms of interfaces and control architecture the panel and interior of this hardware module include a proprietary Data Highway Plus network communication port and a standard RS-232 serial communication port supporting DF1 and ASCII protocols. It also contains a physical keyswitch to control three operating modes and a built-in real-time clock calendar chip along with a set of LED status indicators to demonstrate CPU status and network communication activities.
This SLC 5/04 processor may still be available for purchase and support from Apter Power Company beyond End-Of-Life (EOL) by the original manufacturer.
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Allen Bradley 1747-L542 SLC 5/04 Modular Controller Manuals, Datasheets, Drivers, Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Automotive Assembly Manufacturing
Used in distributed control systems for body stamping shops or final assembly conveyors, coordinating welding robot logic via DH+ networks.
Water Treatment & Pumping Stations
Controls filter backwashing, chemical dosing systems, and interlocking start-stops of large water pumps, enabling centralized monitoring of pressure and flow.
Food & Beverage Packaging
Applied in stand-alone cabinets for high-speed filling lines, labeling machines, and palletizers to execute sensor counting, limit triggering, and sequential valve control.
Iron & Steel Post-Processing
Used in transport systems for cold rolling, shearing lines, and continuous annealing furnaces to control roller speed matching and precise sheet positioning.
Cement & Aggregate Conveying
Manages interlocking protection systems for large belt conveyors and bucket elevators in cement clinker lines, preventing material accumulation and alarming belt misalignment.
Pulp & Paper Processing
Controls pulp refiners, mixing chests, and slitter-cutter peripherals, handling bulk discrete I/O and consolidating chassis status to the central control room.
Cut power before handling 1747-L542. Replace 1747-BA battery under power or within 30 minutes post-shutdown to avoid RAM data loss. Prevent abnormal voltage on DH+ port.
1747-L542 features a built-in 3-pin Data Highway Plus (DH+) port. This port supports network communication at 57.6 Kbps, 115.2 Kbps, or 230.4 Kbps, and connects other SLC 5/04 or PLC-5 controllers and HMI operator interfaces.
It is an SLC 5/04 modular controller processor unit manufactured by Allen-Bradley.
What industrial scenarios is 1747-L542 primarily used for?
Used to execute ladder logic programming and machine control in mid-sized industrial automation networks.
How much user program memory does 1747-L542 have?
This hardware is configured with 32K words of non-volatile user program memory.
Does 1747-L542 support standard serial communication?
Yes. It contains an RS-232 serial interface supporting DF1 and ASCII protocols.
What component does 1747-L542 include to prevent data loss during power-off?
It includes a 1747-BA lithium battery assembly to sustain RAM data retention.
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Disclaimer: We are not an authorized distributor or distributor of the product manufacturer of this website, The product may have older date codes or be an older series than that available direct from the factory or authorized dealers. Because our company is not an authorized distributor of this product, the Original Manufacturer`s warranty does not apply.While many DCS PLC products will have firmware already installed, Our company makes no representation as to whether a DSC PLC product will or will not have firmware and, if it does have firmware, whether the firmware is the revision level that you need for your application. Our company also makes no representations as to your ability or right to download or otherwise obtain firmware for the product from our company, its distributors, or any other source. Our company also makes no representations as to your right to install any such firmware on the product. Our company will not obtain or supply firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing firmware.
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