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      1785-MS

      CMOS RAM memory module

      Product Information

      Product Describe

      CMOS RAM memory module is

      intended to be used with the

      PLC-5/15 and -5/25 processors

      from the 1785 bulletin

      • Manufacturer:
        Allen-Bradley
      • Product Category:
        PLC System
      • Spare Part Number:
        1785-MS/A
      • Estimated shipping dimensions:
        10.5x2.6x5.6cm
      • Weight:
        0.24 kg
      • Tariff Code:
        8537101190
      • Country of origin:
        USA
      • Place of shipment:
        Xiamen, Fujian, China
      • Product Line:
        PLC 5
      • Device:
        Memory module
      • Type:
        CMOS RAM
      • Capacity:
        8,000 words
      • Compatibility:
        PLC-5/15 and -5/25
      • Mounting:
        I/O Rack
      • Operating temperature:
        0 to 60 degrees Celsius
      • Relative humidity:
        5 to95%
      • 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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      Learn More Policy
      Manuals
      1785-MS.pdf
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          FAQ

          • What is the architectural purpose of the 1785-MS module within an Allen-Bradley PLC-5 control system?
            The 1785-MS is a dedicated CMOS RAM memory expansion module in the Allen-Bradley PLC-5 family. It provides 8 K words (16,384 bytes) of RAM used to augment the user program storage and data table capacity of compatible PLC-5 processors, enabling more complex logic and parameter management.
          • How does the 1785-MS module interface with PLC-5 processors and what installation topology does it support?
            The 1785-MS mounts directly onto an I/O rack associated with PLC-5 processors (such as PLC-5/15 and PLC-5/25), acting as an external RAM cartridge that interfaces with the processor’s memory bus to increase working memory for program execution and data retention.
          • How does the 1785-MS module impact system performance, particularly in logic execution and memory paging?
            By expanding available RAM via the 1785-MS, PLC-5 processors can maintain larger ladder logic and data structures in primary memory, reducing the need for overlay or segmented code execution and improving deterministic scan responsiveness in complex control applications.
          • How does the 1785-MS differ from other memory modules in the 1785 series, such as EEPROM or larger RAM options?
            The 1785-MS provides pure RAM expansion (8 K words), unlike EEPROM modules (e.g., 1785-MJ) which offer non-volatile backup of programs, and larger memory modules (e.g., 16 K word EEPROM). The 1785-MS is specifically used to increase volatile data and logic capacity rather than serve as permanent program backup.

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