Allen Bradley 1756-L55M12 Processor Module
Memory Architecture & Storage
The 1756-L55M12 processor features a sophisticated memory architecture with 750 kbytes allocated for user logic and data execution, plus an additional 208 kbytes dedicated to I/O memory management. This model does not include integrated nonvolatile memory, requiring engineers to maintain consistent backplane power or implement battery-backed RAM solutions to prevent data loss during extended power interruptions.
Power Requirements & Thermal Management
For accurate power supply calculations in multi-slot chassis configurations, the module requires:
- 1.23 A at 5.1V DC (Logic circuit)
- 0.014 A at 24V DC (Auxiliary circuit)
With a thermal dissipation rating of 19.1 BTU/hr, ensure adequate vertical spacing between the chassis and wire ways to facilitate proper passive convection cooling and prevent thermal overstress.
Communication Interfaces
The processor supports multiple communication protocols including RS-232 serial interfacing using 1756-CP3 or 1747-CP3 cables (Wiring Category 2). It functions as a bridge or owner for ControlNet, EtherNet/IP, DeviceNet, DH+, and Universal Remote I/O networks when paired with corresponding 1756-series communication modules in the same chassis.
High-Availability Redundancy
The 1756-L55M12 supports deployment in high-availability Hot Backup systems, though with specific topology requirements. Redundant controllers must operate within a ControlNet network to enable proper state-transfer synchronization between primary and secondary units. EtherNet/IP alone does not support native redundancy in the L55 series firmware.
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Compatible Product Portfolio
| I/O & Interface Modules |
Controllers & CPUs |
Power & Accessories |
- 1734-IB8S
- 1734-OB8
- 1746-IC16
- 1746-NR4
- 1746-OA16
- 1756-IB16ISOE
- 1756-IF16 / IF16H / IF8
- 1756-IR6I
|
- 1747-L552
- 1756-L55M12 / L55M13 / L55M14 / L55M16
- 1756-L55M22 / L55M23
- 1756-L60M03SE
- 1756-L61 / L61S
- 1756-L62 / L62S
- 1756-L63 / L63/A
- 1756-L71
|
- 1746-A10
- 1746-P4
- 1747-KFC15
- 1756-BA2
- 1756-CN2/C
|
