Product Details
Technical Overview
The 1756-L55M13 is a high-performance central processing unit within the ControlLogix 5555 controller family. Engineered for complex industrial automation tasks, this module provides robust control for large-scale applications requiring high-speed logic execution and significant I/O capacity. It features a 1.5 MB user memory and a dedicated 208 KB I/O memory buffer, ensuring efficient data handling and minimized scan times for critical process control.
Designed for chassis-based mounting, the 1756-L55M13 communicates across the 1756 backplane and includes an integrated RS-232 serial port for local programming, diagnostics, and interfacing with older peripheral devices. While the series has been succeeded by newer Logix controllers, it remains a cornerstone for maintaining and supporting legacy ControlLogix architectures.
Product Specifications
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Manufacturer: Allen-Bradley / Rockwell Automation
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Controller Series: ControlLogix 5555
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Part Number: 1756-L55M13
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User Memory: 1.5 MB
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I/O Memory: 208 KB
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Maximum Digital I/O: 128,000 signals
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Maximum Analog I/O: 4,000 inputs / 2,000 outputs
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Logic Scan Time: 0.08 ms typical
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Integrated Communication: One (1) RS-232 Serial Port
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Backplane Current (5V DC): 1.23 Amps
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Backplane Current (24V DC): 14 mA
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Battery Support: Compatible with 1756-BA1 or 1756-BATM
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Operating Temperature: 0°C to 60°C (32°F to 140°F)
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Vibration Resistance: 2 G at 10 to 500 Hz
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Approximate Weight: 0.37 kg (0.81 lbs)
Application and Maintenance
The 1756-L55M13 is typically deployed in discrete manufacturing, motion control, and batch processing where high-density I/O and reliable performance are required. Users should note that this specific model was officially discontinued by the manufacturer on March 31, 2011, making it a critical item for spare-parts inventory to prevent extended downtime in existing facilities. Proper maintenance involves regular battery testing and firmware management via RSLogix 5000 software to ensure system stability.
Frequently Asked Questions
Is the 1756-L55M13 compatible with modern ControlLogix 1756-A7 or A10 chassis?Yes, the module is compatible with standard 1756 ControlLogix chassis. However, ensure that the power supply installed in the chassis provides sufficient 5V DC current to meet the 1.23A requirement of this processor.
Can I use this module to replace a 5580 series controller?No. The original description contained a conflict; the 1756-L55M13 belongs to the 5555 series. It cannot directly replace a 5580 series controller due to differences in architecture and software requirements.
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.
Tech & Buying Guide
Understanding Safety Relays in Industrial Automation: Architecture, Operation, and Functional Safety
Standard electromechanical relays provide basic electrical isolation between low-voltage control circuits and high-power output loads. A traditional switching relay features a magnetic coil driving mechanical Common (COM), Normally-Open (NO), and Normally-Closed (NC) contacts. However, standard relays pose severe functional risks when deployed in critical safety interlock circuits. High current inrush or mechanical wear can weld contacts together permanently. If contact welding occurs in an emergency stop circuit, pressing the button fails to halt hazardous machinery movements. Consequently, global functional safety standards prohibit standard relays for critical machine guarding functions.
Mastering Wire Identification in Industrial Automation: The Power of Ferrules and Cross-Ferruling
Proper wire labeling forms the cornerstone of reliable control system installation and long-term maintenance. In complex industrial automation environments, technicians terminate thousands of conductor ends inside control panels, marshalling racks, and field junction boxes. Ferrules serve as individual tube-shaped sleeve markers slipped onto conductors before final termination. While technicians historically relied on pre-printed individual letter rings, modern control panel builders utilize automated ferrule printing machines. These thermal-transfer printers generate durable, single-sleeve heat-shrink tags directly matching approved wiring schematics, significantly accelerating cabinet assembly workflows.
Understanding Marshalling Cabinets in Industrial Automation and Control Systems
Marshalling cabinets serve as the crucial connection hub between field instruments and centralized processing units. In large DCS and PLC control system architectures, hundreds of multipair field cables run from local junction boxes to the central instrument equipment room. The marshalling cabinet houses field terminal blocks, surge arresters, intrinsic safety isolation barriers, and interposing relays. By segregating field field-wiring terminations from sensitive processor hardware, engineers protect expensive controller backplanes from high-voltage transients. Consequently, this modular separation dramatically streamlines maintenance workflows and simplifies system expansion.