1756-M1 | Allen-Bradley Memory Module

The Allen-Bradley 1756-M1 is a 512 Kword expansion memory module engineered for legacy ControlLogix controllers. Installed directly into the controller's dedicated memory slot, it expands the available storage for user program logic, data tags, and system routines. This expansion ensures stable execution of complex sequential, process, or motion control tasks within the Logix5000 architecture.

Memory Expansion and Controller Integration

The module adds 512 Kwords of non-volatile program and data storage to compatible first-generation ControlLogix processors. By expanding onboard memory capacity, the module allows engineers to scale control programs, handle larger tag databases, and implement extended data logging without replacing the primary processor hardware.

The unit powered directly from the chassis backplane bus, drawing 760 mA at 5.1 VDC and 2.5 mA at 24 VDC. It exhibits a maximum power dissipation of 6.2 W and a thermal dissipation rating of 21.2 BTU/hr during standard operation.

Physical Construction and Environmental Requirements

Designed for open-type enclosure mounting inside standard 1756 ControlLogix chassis, the 1756-M1 operates reliably within an ambient temperature range of 0 to 60 deg C (32 to 140 deg F). The compact module weighs approximately 0.16 kg (0.35 lbs) and provides 50 V continuous isolation protection to safeguard controller electronics.

Technical Specifications

Frequently Asked Questions

Q: What function does the 1756-M1 module serve in a ControlLogix system? A: The 1756-M1 provides 512 Kwords of additional memory capacity to compatible legacy ControlLogix controllers, accommodating larger application program code and extended data tag storage.

Q: How is power provided to the 1756-M1 memory module? A: The module draws power directly from the ControlLogix chassis backplane, requiring 760 mA at 5.1 VDC and 2.5 mA at 24 VDC during normal operation.