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Allen Bradley | SLC-500 | 1747-L542 | Image

Allen Bradley | SLC-500 | 1747-L542 | Image

Includes a PDF Electric and Supply warranty.

(Never Used)


1 In Stock

3 Yr PDF Supply warranty

What is Surplus?



8 In Stock

2 Yr PDF Supply Warranty

What is Refurbished?

Repair Service


5-10 Days

2 Yr PDF Supply warranty


Other Available Revisions for the 1747-L542 1747-L542/A1747-L542/B1747-L542/C

Common misspellings:
  • l747-L542
  • 17A7-L542
  • 1747-1542
  • 1747-L5A2
  • 1747L542

Technical Specifications for 1747-L542

ManufacturerAllen-Bradley / Rockwell Automation
SeriesSLC 500
Part Number1747-L542
Product TypeModular Processor
Memory32K Words
I/O Capacity4096 discrete I/O
Input Voltage1 Amp at 5 Volts DC, 0 milliamps at 24 Volts DC
Memory BackupFlash EPROM
Operating Temperature0 to 60 degrees Celsius
Relative Humidity5%-95%, Non-condensing


The Allen-Bradley 1747-L542 is a powerful processor that is compatible with the SLC 500 programmable controller system. The 1747-L542 is one specifically in the family of SLC 5/04 processors. These SLC processors offer a wide range of I/O channels, memory, ports, and instruction sets to facilitate meeting the exact needs of a given application. The SLC 5/04 processors let you select a memory capacity of 16K, 32K, or 64K words. The 1747-L542 itself has up to 32K memory, 4096 ports, and 30 I/O module slots. Additionally, the processor has standard battery-backed RAM with backup flash memory to protect your data.

With the 1747-L542, users can configure up to 4096 ports for input and 4096 ports for output. There is a built in RS‐232‐C communications port and a built in DH+ port for communications with other processors, terminals, and interfaces. The DH+ is up to 3 times faster that its DH-485 counterpart. The 1747-L542 interfaces seamlessly with SLC 500 controllers and has a power load of 1A at 5V DC and 0A at 24V DC.  The 1747-L542 is an affordable yet powerful processor which is compatible with a variety of applications including process controls and material handling.

When installing the 1747-L542, care should be taken to never connect or disconnect any module with the power applied. Electrostatic charges should also be considered as they can damage the on-board memory. The 1747-L542 must be inserted into the left slot (slot 0) on the chassis to function properly. Care should be taken to remove the wrapping before operation to prevent overheating.

The Allen-Bradley 1747-L542 processor is an SLC 500 modular processor which belongs to the SLC 5/04 series. The processor can be programmed through ladder-logic and structured text. The processor comes with a built-in RS-232/422/423 communication port which supports the full-duplex, half duplex, DH-485, ASCII, DF1 radio modem, and Modbus RTU master protocols. The program memory available on the 1747-L542 processor is 32K words. The processor discrete I/O capacity is 4096. The remote I/O capacity is up to 4096 inputs and 4096 outputs.  The maximum number of chassis supported by the processor is 3 and the maximum number of I/O slots supported is 30. The memory backup-up option is Flash EPROM. The power requirement of the 1747-L542 processor is 1 Amp at 5 Volts DC and 0 milliamps at 24 Volts DC.

The status indicators available on the 1747-L542 processor include the “Run,” “CPU Fault,” “Forced I/O,” “Battery Low,” and “RS-232” LED indicators. The operating temperature range for the 1747-L542 processor is 0 to 60 degrees Celsius. The recommended temperature range for storage is -40 to 85 degrees Celsius. The range for the non-condensing relative humidity is from 5 to 95%.  The operating and non-operating shock ratings are 2.5 g at 5 to 2000 Hertz and 5 g at 5 to 2000 Hertz, respectively. If the 1747-L542 processor is damaged, the technicians who are commissioned to repair it should take note of the processor type, its operating system, the processor error codes, the revision version of the programming software, and the RSLogix software serial number to diagnose the problem During troubleshooting, all personnel should be kept away from the 1747-L542 processor as long as power is still applied to it.
The 1747-L542 processor is a modular processor. It belongs to the SLC 500 product line from Allen-Bradley.

F.A.Q for 1747-L542

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