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Allen-Bradley 1756-L55M24 Processor Module
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- Part Number: 1756-L55M24
- Brand: Allen-Bradley
- Type: Processor Module
- Barcode: Singapore
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Product Description
Configured for high-speed logic execution and complex control tasks in ControlLogix chassis architectures, the Allen-Bradley 1756-L55M24 (1756-L55 Processor Module) provides direct physical/electrical execution. The controller integrates a 1756-L55 base unit fitted with a 1756-M24 memory card, establishing 3.5 MB of nonvolatile RAM for application program storage and tag database management. The processor interfaces directly across the local backplane to execute multi-tasking operating systems, managing cyclic I/O updating, data handling, and communication parsing without dedicated external coprocessors.
Suffix Breakdown & Model Matrix
| Base Model | Daughterboard Extension | Combined Catalog Number | Nonvolatile Memory Capacity |
|---|---|---|---|
| 1756-L55 | 1756-M12 | 1756-L55M12 | 1.5 MB |
| 1756-L55 | 1756-M13 | 1756-L55M13 | 1.5 MB (with process execution enhancements) |
| 1756-L55 | 1756-M14 | 1756-L55M14 | 3.5 MB |
| 1756-L55 | 1756-M24 | 1756-L55M24 | 3.5 MB |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1756-L55M24 |
| Brand | Allen-Bradley / Rockwell Automation |
| Origin | USA |
| Weight | 0.75 lbs (0.34 kg) |
| Dimensions | ControlLogix Single-Slot Standard Module |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | 4.5 W (Backplane dependent) |
| CPU Architecture | Logix5555 Controller Series |
| Integrated Memory | 3.5 MB Nonvolatile RAM (1756-M24 Expansion Board) |
| Backplane Current | 1.2 A at 5.1 VDC, 14 mA at 24 VDC |
| Mounting Configuration | Chassis Mount (1756 ControlLogix I/O Chassis) |
ControlLogix Deterministic Networks & Firmware Synchronization
The module communicates over the local ControlLogix backplane using EtherNet/IP deterministic networks and CIP interface logic. Backplane bus communication velocity allows deterministic, high-speed data exchanges between the controller and distributed I/O racks. Firmware flash compatibility via RSLogix 5000 / Studio 5000 enables non-destructive system updates, ensuring system synchronization across local backplane expansion slots without physical alterations to module memory boards.
Frequently Asked Questions
Q: Can the 1756-L55M24 controller module be inserted or removed under power (RIUP)?
A: Yes, the 1756-L55M24 supports Removal and Insertion Under Power (RIUP) within a ControlLogix chassis. However, removing an active processor halts all running controller tasks and forces connected output modules into their predefined fault states.
Q: How is memory retained on the 1756-L55M24 during a primary power loss?
A: Nonvolatile memory operation relies on the 1756-M24 memory board paired with an operational battery backup assembly (such as the 1756-BA1 or 1756-BATM) installed on the 1756-L55 base unit to preserve processor RAM state during system power cycling.
Field Installation Guidelines
- Verify chassis frame grounding satisfies IEEE 1100 standards by establishing a direct low-impedance connection between the chassis grounding stud and the enclosure star ground point.
- Align the module circuit board with top and bottom card guides of the assigned chassis slot, sliding the unit firmly until the top and bottom housing latches lock in place.
- Ensure the 1756-M24 memory expansion card is properly seated and mechanically secured to the 1756-L55 motherboard prior to inserting the complete assembly into the ControlLogix rack.
- Maintain a minimum clearance distance of 50 mm (2 inches) above and below the chassis assembly to preserve ambient air circulation across module cooling vents.
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