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Allen Bradley PLC 3 1775-MSA

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1775-MSA

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The Allen Bradley 1775-MSA is a memory module designed for use with the PLC 3 series, providing robust data handling capabilities with advanced error detection and correction features. This module requires an installation in a PLC-3/10 backplane slot and is compatible with multiple processor chassis models.

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Rockwell Disclaimer: The product is used surplus. DO Supply is not an authorized surplus dealer or affiliate for the Manufacturer of this product. The product may have older date codes or be an older series than that available direct from the factory or authorized dealers. Because DO Supply is not an authorized distributor of this product, the Original Manufacturer's warranty does not apply. While many Allen-Bradley PLC products will have firmware already installed, DO Supply makes no representation as to whether a PLC product will or will not have firmware and, if it does have firmware, whether the firmware is the revision level that you need for your application. DO Supply also makes no representations as to your ability or right to download or otherwise obtain firmware for the product from Rockwell, its distributors, or any other source. DO Supply also makes no representations as to your right to install any such firmware on the product. DO Supply will not obtain or supply firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing firmware.

Technical specifications for 1775-MSA

ManufacturerAllen Bradley
Product TypeMemory Module
Product LinePLC 3
Part Number1775-MSA
Weight5.88 lbs (2.66 kg)
Error HandlingDouble-bit error detection
Error DetectionSingle-bit error correction
Compatible Processor Chassis1775-A1, 1775-A2, 1775-A3
Module Installation TypePLC-3/10 Backplane Slot
Auxiliary Supply Current0.5 A
Auxiliary Supply Voltage±15 VDC
Current Consumption2 A (typical)
Supply Voltage5V DC
Data Bus Width16-bit Parallel
Access Time250 ns
Word Length16 bits
Memory Capacity64K Words
Memory TypeError-Correcting RAM
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The 1775-MSA memory module from Allen Bradley is engineered to support the PLC 3 series effectively. As a dedicated memory solution, it boasts a capacity of 64K words and utilizes error-correcting RAM to maintain data accuracy. One of its standout features includes double-bit error detection, which enhances the reliability of data storage. Moreover, single-bit error correction is included, allowing for automatic rectification of certain types of data errors, further solidifying the module's integrity in data handling.

Installation requires integration into a PLC-3/10 backplane slot, ensuring compatibility with numerous processor chassis, including the 1775-A1, 1775-A2, and 1775-A3 models. For operational demands, the 1775-MSA draws a typical current of 2 A and operates at a supply voltage of 5V DC. Additionally, it utilizes an auxiliary voltage of ±15 VDC with a supply current requirement of 0.5 A.

The module operates over a 16-bit parallel data bus, facilitating efficient data transfer within the system. Access times are notably swift, clocking in at approximately 250 ns, which is crucial for performance in the applications it serves. With its robust specifications, the 1775-MSA module enables enhanced processing capabilities, making it an integral component for various automation solutions.

Revision Part #Also known as
1775-MSA Ser A1775-MSA/A, Series A, Rev A
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