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      1747-L20A/C

      Processor Unit

      Product Information

      Product Describe

      Enhanced SLC 500 Fixed Hardware

      Style Programmable Logic Controller (PLC).

      This controller has an embedded

      capacitor-backed RAM with a memory

      size of 1K instruction capacity

      • Manufacturer:
        Allen-Bradley
      • Product Category:
        PLC System
      • Spare Part Number:
        1747-L20A
      • Estimated shipping dimensions:
        15.2 cm x 17.8 cm x 17.8 cm
      • Weight:
        0.2 kg
      • Tariff Code:
        8537101190
      • Country of origin:
        USA
      • Place of shipment:
        Xiamen, Fujian, China
      • Controller memory:
        1K instruction capacity
      • Typical scan time:
        8 miliseconds / 1K
      • Bit execution:
        4 microseconds
      • Power supply Inrush rating:
        30 Amperes
      • Power Supply hold-up time:
        20 - 70 ms
      • Inputs:
        (12) 120 V AC
      • Outputs:
        8 AC/DC Relay
      • Line Power:
        120-240 Volts AC
      • Stock:
        30
      By purchasing this item, you agree to the Terms & Conditions
      Moore Automated is NOT an authorized distributor of Allen-Bradley
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      Moore Automated is not an authorized distributor, reseller or representative of the products featured on this website.
      All product names, trademarks, brands and logos used on this site are the property of their respective owners. The depiction, description or sale of products featuring these names, trademarks, brands and logos is for identification purposes only and is not intended to indicate any affiliation with or authorization by any rights holder.
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      Manuals
      1747-L20A/C.pdf
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          FAQ

          • What is the architectural classification and design intent of the 1747-L20A/C controller within the Allen-Bradley SLC 500 portfolio?
            The 1747-L20A/C is a fixed-I/O PLC controller in the Allen-Bradley SLC 500 series that integrates a CPU, power supply, and embedded I/O in a compact enclosure. It is engineered for small-scale automation applications where a modular chassis is not required, providing a streamlined control solution with a fixed complement of inputs and outputs.
          • How does the 1747-L20A/C support discrete signal interfacing, and what are its embedded I/O characteristics?
            The 1747-L20A/C features a total of 20 I/O points, consisting of twelve discrete inputs and eight discrete outputs. The 1747-L20A variant uses 120 VAC rated inputs, while the 1747-L20C variant uses 24 VDC sink-type inputs, both paired with AC/DC relay outputs to actuate field devices without external I/O modules.
          • What memory architecture and processing capacity does the 1747-L20A/C employ for embedded control logic?
            The 1747-L20A/C incorporates 1 K instruction memory backed by capacitor-supported RAM, enabling execution of ladder logic routines for targeted control sequences. The embedded memory can also be backed up via optional EEPROM or UVPROM modules to preserve logic across power cycles.
          • What communication and network capabilities are provided by the 1747-L20A/C for system integration?
            The 1747-L20A/C uses an integrated DH-485 communication interface for connectivity to programming workstations, RSLogix 500, and other SLC 500 controllers. This protocol supports peer-to-peer messaging and facilitates interaction with HMIs and supervisory systems in legacy automation networks.

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            As one of the most trusted industrial automation parts suppliers, we understand the importance of dependable performance. That’s why we go beyond industry standards—offering a 1-year warranty that outperforms typical coverage. Whether you’re replacing obsolete components or maintaining critical systems, Moore Automated provides the high-quality parts and expert repairs you need.


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