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Allen Bradley 1774 PLCs and Modules 1774-MA

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1774-MA

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The 1774-MA memory module from Allen Bradley is critical for enhancing PLC functionality. With a memory capacity of 4K words, it operates efficiently with a word size of 16 bits. This module integrates seamlessly into the 1774 PLC chassis, providing advanced communication and data handling capabilities.

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2 Year DO Supply Warranty
Not an Authorized Distributor: DO Supply is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All of our products come with DO Supply's 2-year warranty.
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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 1774-MA

ManufacturerAllen Bradley
Product TypeMemory Module
Product Line1774 PLCs and Modules
Part Number1774-MA
UPC081159714116
Weight3.63 lbs (1.64 kg)
Support for Other Memory ModulesYes
Peer to Peer MessagingYes
Pass-Thru ProtocolYes
Memory Capacity4K words
Word Size16-bit
Access Time450 ns
Cycle Time1.2 µs
Bus InterfaceParallel
Voltage Rating5 V DC regulated
Current Consumption1.5 A max
Connector TypeEdge card connector
Mounting StyleRack-mounted (1774 PLC chassis)
Backup MethodBattery-backed RAM
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The 1774-MA from Allen Bradley serves as a memory module designed for use within the 1774 series of PLCs and modules. It offers a robust memory capacity of 4K words, structured in a 16-bit format. This organization allows for effective data manipulation and is advantageous for various automation applications.

The module facilitates peer-to-peer messaging and supports other memory modules, enhancing communication capabilities within a system. It employs a pass-thru protocol, promoting streamlined operations in interconnected PLC environments. Access to the memory is fast, with an access time of 450 nanoseconds and a cycle time of just 1.2 microseconds.

Communication with the module occurs via a parallel bus interface, ensuring effective data transfer with minimal latency. The unit operates on a regulated voltage of 5 V DC and has a maximum current consumption of 1.5 A, indicating efficient power management.

For physical connection, the 1774-MA uses an edge card connector, and it is intended for rack-mounted applications within the 1774 PLC chassis. Data integrity is maintained through a battery-backed RAM backup method, providing security against data loss during power interruptions. This memory module is essential for improving the operational capabilities of Allen Bradley’s PLC systems.