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1747-L542

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Allen-Bradley 1747-L542 is a 32K SLC 5/04 controller whose DH+ and RS-232 channels support legacy chassis control, programming, and peer communication.
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Technical specifications for 1747-L542

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1747-L542
  • Product Family:
    SLC 500
  • Product Type:
    SLC 5/04 32K Programmable Controller
  • Stock:
    1
  • Processor family:
    SLC 5/04
  • Program memory:
    32 K words
  • Maximum I/O capacity:
    4096 inputs and 4096 outputs, subject to chassis power and processor memory limits
  • Maximum chassis / slots:
    3 chassis / 30 I/O slots
  • Channel 0:
    RS-232 for DH-485, DF1, or ASCII
  • Channel 1:
    Data Highway Plus (DH+)
  • Backplane loading:
    1.0 A at 5 V DC; see nameplate note for older 24 V DC loading
  • Minimum heat dissipation:
    4.0 W
  • Operating temperature:
    0…60 °C
  • Weight:
    0.32 kg
  • Estimated shipping dimensions:
    3.46x13.02x14.45cm
  • Tariff Code:
    8537101190
  • Country of origin:
    Singapore
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals DH+ Channel Role Memory & OS Match Chassis Power Review Product Applications

Features:

  • 32 K-word processor: sized for established modular SLC applications
  • DH+ channel: supports the documented legacy peer and programming network
  • Separate serial path: channel 0 can serve DF1, DH-485, or ASCII communication
1747-L542 is selected for an SLC 5/04 architecture in which Data Highway Plus remains part of the operating plant.

Its 32 K-word program capacity is paired with the modular chassis limits rather than treated as an unlimited I/O count.

The separate serial channel leaves maintenance, ASCII, or DF1 duties independent of the DH+ connection.
Apter Power can review 1747-L542 Series identity, label date, DH+ role, official records, condition, and quotation requirements.
Allen-Bradley 1747-L542 SLC 5/04 32K Programmable Controller Manuals,Datasheets,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. All prices are shown in USD.
  • Node record: preserve the validated DH+ address and network rate before processor removal
  • Peer traffic: identify messaging and programming stations that depend on channel 1
  • Cutover evidence: confirm node visibility and message completion after the processor returns to RUN
  • Backup identity: retain the application, data files, and memory-module catalog
  • Operating system: match the documented OS family and FRN to the project requirements
  • Controlled restore: verify keyswitch state and fault indicators before enabling outputs
  • Five-volt load: include the processor's 1.0 A backplane demand
  • Older hardware: read the label before assigning the 24 V DC current value
  • Thermal total: calculate the complete chassis load and heat contribution with installed I/O
  • Legacy DH+ cell: retain controller and peer communication on an installed Data Highway Plus network
  • Modular machine control: execute a 32 K-word SLC application across one to three chassis
  • Serial device coordination: use the documented channel 0 protocol for a matched terminal or device
Description
A 32 K-word control program and a dedicated Data Highway Plus channel define 1747-L542 within the SLC 5/04 range. The processor occupies one SLC 500 chassis slot and supports as many as three chassis and 30 I/O slots within the documented memory and power limits.

For established DH+ plants, 1747-L542 keeps peer messaging and programming traffic on channel 1 while channel 0 can serve RS-232, DF1, DH-485, or ASCII duties. This two-channel arrangement helps preserve a legacy network without adding the Ethernet role used by SLC 5/05 processors.

Service planning for 1747-L542 should retain the processor Series, operating-system level, memory-module record, DH+ node and rate, serial settings, chassis power calculation, and application backup. Older units manufactured before April 2002 also require their nameplate-specific 24 V DC loading to be considered.
Revisions

Revision Part #

Also known as

1747-L542 Ser A
1747-L542/A, Series A, Rev A
1747-L542 Ser B
1747-L542/B, Series B, Rev B
1747-L542 Ser C
1747-L542/C, Series C, Rev C
1747-L542 Ser D
1747-L542/D, Series D, Rev D
Alternative Names
1747L542 1747 L542 SLC 5/04 32K Controller 1747-L542 Series D
Technical notes
Nameplate date changes the chassis calculation for 1747-L542: units manufactured before April 2002 may draw 200 mA at 24 V DC, while later units are listed at 0 mA. Preserve the exact Series and operating-system record before transferring a memory module or restoring a DH+ project.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
Why can 1747-L542 appear healthy locally while DH+ messages still fail?
Separate CPU operation from channel 1 communication. Check the DH+ node, rate, trunk condition, termination, duplicate addresses, and the message status in both peers before changing the controller program.
What evidence should be captured before moving an EEPROM to 1747-L542?
Record the source and target Series, operating-system level, memory-module catalog, application revision, status-file options, and keyswitch state. Use only a manufacturer-documented memory and OS combination.
How should an intermittent battery indication on 1747-L542 be handled during an outage?
Save the current application first, remove chassis power, and follow the official battery procedure. After replacement, verify the BATT indicator and confirm that the required retentive data survived the maintenance window.
Which checks help distinguish a chassis problem from a processor fault on 1747-L542?
Review the FLT pattern, chassis power rails, slot seating, power-supply margin, and module indicators. Test with the approved rack configuration before declaring the processor defective.
Can 1747-L542 be replaced by an Ethernet SLC processor without project changes?
No automatic equivalence is established. The network channel, address method, messaging path, software project, HMI links, and acceptance tests all change when DH+ is replaced by Ethernet.
What should a time-critical RFQ for 1747-L542 include?
Provide the full catalog, Series and OS labels, quantity, condition requirement, destination, delivery target, memory-module catalog, DH+ role, and clear front and side photographs.