In modern industrial automation, reliable communication between remote I/O and PLCs is essential. The Schneider Electric CRA module enables efficient Ethernet-based remote I/O connectivity in PLC and DCS systems, improving scalability, diagnostics, and overall networked automation performance.
Product Details
Overview
The Allen-Bradley 1747-L542 is a mid-range processor designed for the SLC 5/04 series, supporting moderate I/O and memory demands. It enables robust control and communication in legacy automation systems, compatible with both Data Highway Plus (DH+) and RS-232 protocols for programming and device interfacing. The module includes an integrated real-time clock, advanced instruction set, and battery-backed memory, offering reliable performance for a range of industrial applications.
Key Features
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Mid-range processing for moderate I/O and memory requirements
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DH+ networking for peer-to-peer communication with SLC, PLC, and PanelView devices
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RS-232 port supporting DF1, ASCII, and Modbus RTU protocols
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Advanced instruction set including math, PID, ASCII handling, and diagnostics
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Integrated real-time clock for time-based operations and data logging
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Supports battery backup for program and data retention
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Chassis-mounted installation compatible with SLC 5/04 racks
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Discontinued status with repair and replacement guidance from Rockwell Automation
Technical Specifications
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Manufacturer: Allen-Bradley
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Product Line: SLC 5/04 Series
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Part Number: 1747-L542
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User Memory: 32K words
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Communication Ports: DH+ (Data Highway Plus), RS-232 (DF1, ASCII, Modbus RTU)
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Instruction Set: Advanced (math, PID, ASCII, diagnostics)
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Real-Time Clock: Integrated
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Battery Backup: Supported
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Mounting Type: Chassis-based
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Power Supply Requirement: Separate supply needed
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Lifecycle Status: Discontinued, replacement recommended
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Repair Options: Available via Rockwell Automation support
Application Scenarios
The 1747-L542 processor is suitable for:
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Mid-range automation applications requiring reliable control and moderate memory
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Integration into existing SLC 500 or SLC 5/04 infrastructure
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Systems that require time-based logging or scheduling with the real-time clock
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Networks using DH+ or RS-232 communication for device and operator interface
FAQs
Q: Can the 1747-L542 processor interface with modern devices?
A: It supports legacy DH+ and RS-232 protocols. For newer devices, converters or protocol adapters may be required.
Q: How much memory is available for user programs?
A: The module includes 32K words of user memory for program storage.
Q: Is battery backup supported?
A: Yes, battery-backed memory retains program and data when power is off.
Q: What replacement options exist for discontinued units?
A: Rockwell Automation provides engineering replacement guidance and repair services.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
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