Allen-Bradley 1756-L55M13 ControlLogix Processor 1.5MB
Introduction:
ControlLogix 5555 processor with 1.5MB user memory and 208KB I/O memory. Supports 128,000 I/O points.
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Product Overview
Controller Design and Application
The Allen-Bradley 1756-L55M13 is a ControlLogix Logix5555 processor from the ControlLogix series. This controller provides 1.5 Mbytes of data and logic memory. An additional 208 Kbytes of I/O memory is available for I/O management. Consequently, the 1756-L55M13 suits medium to large automation applications requiring substantial memory capacity. The controller is an open-style module with no enclosure rating.
Memory Configuration
The 1756-L55M13 features 1.5 MB of RAM for user program and data storage. Therefore, it handles complex control logic and data processing efficiently. Please note that this particular controller does not have nonvolatile memory available on board. Consequently, program backup requires external storage or battery-backed retention. The controller uses a 1756-BA1 or 1756-BATM lithium battery for memory backup during power loss.
Communication Protocol Support
The 1756-L55M13 supports a wide range of communication options for flexible system integration. For example, DeviceNet, ControlNet, and Ethernet/IP are all supported. Universal Remote I/O serial, Data Highway Plus, and Modbus via ladder routine are also available. Additionally, SynchLink and DH-485 protocols are supported. Consequently, the controller integrates seamlessly into existing multi-network environments.
Technical Specifications
General Specifications
Manufacturer: Rockwell Automation
Brand: Allen-Bradley
Part Number: 1756-L55M13
Series: ControlLogix (Series A)
Module Type: Logix5555 Processor Module
UPC: 10612598269645
Memory Specifications
| Parameter | Value |
|---|---|
| RAM (User Memory) | 1.5 MB |
| I/O Memory | 208 KB |
| Nonvolatile Memory | Not available |
| Backup Battery | 1756-BA1 or 1756-BATM |
I/O Capacity
| Parameter | Value |
|---|---|
| Maximum I/O | 128,000 |
| Maximum Analog Inputs | 4,000 |
| Maximum Analog Outputs | 2,000 |
Performance Specifications
| Parameter | Value |
|---|---|
| Program Scan Time | 0.08 milliseconds |
Power Specifications
| Parameter | Value |
|---|---|
| Backplane Current (5V DC) | 1.23 Amps |
| Backplane Current (24V DC) | 14 milliamps |
| Power Dissipation | 5.6 W |
| Thermal Dissipation | 19.1 BTU/hr |
Isolation Specifications
| Parameter | Value |
|---|---|
| Insulation Type | Basic |
| Continuous Isolation Voltage | 30V |
| Dielectric Test | 707V DC for 60 seconds |
Environmental Specifications
| Parameter | Value |
|---|---|
| Operating Temperature | 0 to 60°C (32 to 140°F) |
| Storage Temperature | -40 to 85°C |
| Relative Humidity | 5 to 95% (non-condensing) |
| Vibration | 2G at 10 to 500 Hz |
| Operating Shock | 30G |
| Non-Operating Shock | 50G |
EMC Specifications
Conducted RF Immunity: 10V rms with 1 kHz sine-wave 80% AM from 150 kHz to 80 MHz
Supported Communication Networks
The 1756-L55M13 supports multiple industrial networks.
| Network Type | Support |
|---|---|
| DeviceNet | Yes |
| ControlNet | Yes |
| Ethernet/IP | Yes |
| Universal Remote I/O | Yes (serial) |
| Data Highway Plus | Yes |
| Modbus | Yes (via ladder routine) |
| SynchLink | Yes |
| DH-485 | Yes |
Physical Specifications
| Parameter | Value |
|---|---|
| Weight | 0.35 kg (0.78 lbs) |
| Enclosure Type | Open-style (no rating) |
| Slot Width | Single slot |
Compatible Programming Cables
1756-CP3 for controller connection
1747-CP3 for controller connection
Redundancy Capability
The 1756-L55M13 can be used in a redundant controller system. Therefore, high-availability applications are supported. However, redundant controllers must be located on the same ControlNet network. Consequently, network planning is essential for redundancy implementations.
Installation Guide
Follow these steps to install the Allen-Bradley 1756-L55M13 correctly.
Power Down Chassis: First, disconnect power from the 1756 chassis completely.
Select Slot: Next, choose an available slot in the ControlLogix chassis.
Insert Processor: Then, slide the 1756-L55M13 firmly into the selected slot.
Secure Module: After that, engage the locking mechanism to hold the processor in place.
Install Battery: Meanwhile, install a 1756-BA1 or 1756-BATM battery for memory backup.
Apply Power: Finally, restore power and verify the processor status.
The 1756-L55M13 requires a battery for RAM retention during power loss. Therefore, always install a compatible battery before commissioning. In addition, use only the specified programming cables (1756-CP3 or 1747-CP3). Consequently, proper installation ensures reliable processor operation.
Package List
The package includes the following physical items.
Allen-Bradley 1756-L55M13 ControlLogix processor module (1 piece)
Product label with part number and specifications
Anti-static protective bag for safe transport
*Note: The battery (1756-BA1 or 1756-BATM) is not included. Programming cables are sold separately. No programming software is provided with this processor.*
Frequently Asked Questions (FAQ)
1. How much memory does the 1756-L55M13 have?
The Allen-Bradley 1756-L55M13 provides 1.5 MB of user memory and 208 KB of I/O memory. Therefore, it handles substantial control programs and data tables. Please note that nonvolatile memory is not available on this controller. Consequently, program backup requires a battery or external storage.
2. What is the maximum I/O capacity of the 1756-L55M13?
The Allen-Bradley 1756-L55M13 supports up to 128,000 total I/O points. Specifically, it handles 4,000 analog inputs and 2,000 analog outputs. Therefore, large-scale automation systems are well within its capabilities. Consequently, this processor suits demanding industrial applications.
3. What battery does the 1756-L55M13 use?
The Allen-Bradley 1756-L55M13 uses either the 1756-BA1 or 1756-BATM lithium battery. Therefore, the battery provides RAM backup during power loss. The battery can be replaced when needed. Consequently, regular battery monitoring is recommended to prevent program loss.
4. What is the program scan time of the 1756-L55M13?
The Allen-Bradley 1756-L55M13 delivers a program scan time of 0.08 milliseconds. Therefore, it responds quickly to input changes and control events. This fast scan time suits high-speed automation applications. Consequently, the processor maintains precise control even in demanding processes.
5. What communication networks does the 1756-L55M13 support?
The Allen-Bradley 1756-L55M13 supports DeviceNet, ControlNet, and Ethernet/IP. In addition, Universal Remote I/O serial, Data Highway Plus, and Modbus via ladder routine are supported. SynchLink and DH-485 are also available. Consequently, the processor integrates into virtually any industrial network environment.
6. Can the 1756-L55M13 be used in redundant systems?
Yes, the Allen-Bradley 1756-L55M13 can be used in a redundant controller system. However, both controllers must be located on the same ControlNet network. Therefore, network planning is essential for redundancy implementations. Consequently, high-availability applications are supported with proper configuration.
7. What is the operating temperature range of the 1756-L55M13?
The Allen-Bradley 1756-L55M13 operates between 0 and 60°C (32 to 140°F). Therefore, it suits typical industrial control room environments. Storage temperature ranges from -40 to 85°C. Consequently, the processor tolerates a wide range of environmental conditions.
Related Accessories
Enhance your ControlLogix system with these compatible parts.
Battery: Allen-Bradley 1756-BA1 or 1756-BATM for memory backup
Programming Cable: Allen-Bradley 1756-CP3 or 1747-CP3 for controller connection
Chassis: Allen-Bradley 1756-A series for processor and I/O mounting
Power Supply: Allen-Bradley 1756-P series for backplane power
Programming Software: Rockwell RSLogix 5000 for controller configuration
Always use genuine Allen-Bradley components with the 1756-L55M13. Therefore, third-party batteries may not provide the same life expectancy or compatibility. In addition, verify network compatibility before integrating into existing systems. Consequently, using authentic parts ensures optimal processor performance and system reliability.