Product Introduction
The Allen Bradley 1756-L55M12 ControlLogix Logix5555 Processor is a high-performance programmable automation controller (PAC) designed for the ControlLogix platform, providing robust control for industrial automation systems. This processor features 750 KB of user memory, enabling efficient execution of medium-to-large control programs, data acquisition, motion control, and communication with I/O and network modules.
The L55M12 processor is ideal for applications that require deterministic real-time control combined with moderate memory capacity. It integrates seamlessly with other ControlLogix modules, supporting digital, analog, motion, and communication tasks while ensuring stable operation under standard industrial environmental conditions.
This processor is commonly used in manufacturing automation, process control, and machinery monitoring systems, where reliable and predictable CPU performance is critical.
Product Specifications
| Parameter |
Specification |
| Model |
1756-L55M12 |
| Manufacturer |
Allen Bradley |
| Product Type |
Logix5555 Processor |
| System Compatibility |
ControlLogix Platform |
| User Memory |
750 KB |
| Mounting Type |
ControlLogix chassis backplane |
| Electrical Isolation |
Standard backplane isolation |
| Backplane Current @ 5 VDC |
6.31 mA |
| Backplane Current @ 24 VDC |
14 mA |
| Operating Temperature Range |
0 to 60°C (32 to 140°F) |
| Power Dissipation |
Low power, suitable for compact systems |
| Dimensions |
145.2 x 34.6 x 139.6 mm |
| Weight |
0.522 kg |
Applications
● Central processor for medium-scale industrial automation systems.
● Executes real-time control logic, data acquisition, and motion control routines.
● Interfaces with ControlLogix I/O modules, communication modules, and specialty devices.
● Used in manufacturing, process control, and machinery automation for reliable control.
● Supports alarm monitoring, sequencing, and deterministic control operations.
● Suitable for applications requiring moderate memory with high reliability CPU performance.
Advantages
● Provides 750 KB user memory, suitable for mid-range application programs.
● Low backplane current ensures efficient power usage.
● Standard electrical isolation enhances system protection and reliability.
● Deterministic execution supports real-time control and process monitoring.
● Compatible with other ControlLogix modules for flexible system expansion.
● Compact and lightweight design allows easy integration into standard ControlLogix racks.
FAQ
1. What is the user memory of the 1756-L55M12?
It provides 750 KB for program execution, data acquisition, and control routines.
2. Can it execute real-time control programs?
Yes, it supports deterministic execution for real-time control, motion, and monitoring.
3. Is it compatible with other ControlLogix modules?
Yes, it integrates seamlessly with digital, analog, motion, and communication modules.
4. What is the backplane current requirement?
It draws 6.31 mA at 5 VDC and 14 mA at 24 VDC.
5. Does it provide electrical isolation?
Yes, the processor provides standard isolation for backplane and module integration.
6. What types of industrial applications is it suitable for?
It is ideal for manufacturing automation, process control, and machinery monitoring systems.
7. Can it support alarm and sequencing operations?
Yes, it can execute control logic for alarms, sequences, and interlocks.
8. Is it suitable for medium-scale automation systems?
Yes, the memory and performance are optimized for mid-range industrial automation.
9. Can it handle network communication with other devices?
Yes, it supports integration with ControlLogix communication modules for Ethernet, DeviceNet, or other protocols.
10. Is the processor energy efficient?
Yes, low backplane current and typical power dissipation make it suitable for energy-conscious applications.
Related Models
| Model |
Description |
Key Technical Data |
| 1756-L55 |
Logix5555 Processor |
Mid-range CPU with standard memory |
| 1756-L1M2 |
Logix5550 Processor |
1 MB memory, advanced CPU module |
| 1756-L73 |
Logix5550 Processor |
Expanded memory, high-performance CPU |
| 1756-L71 |
Logix5550 Processor |
High-performance control module |
| 1756-EN2T |
Ethernet Communication Module |
Network interface for ControlLogix |
| 1756-PA75 |
Power Supply Module |
Redundant/regulated power for ControlLogix chassis |
Popular Models
| Model |
Product Type |
Key Features |
| 1756-IF16 |
Analog Input Module |
16-channel voltage/current input |
| 1756-OB16 |
Digital Output Module |
16-channel output with isolation |
| 1756-IB16 |
Digital Input Module |
16-channel isolated input |
| 1756-IV32 |
Sourcing Digital Input Module |
32-point digital inputs |
| 1756-IT6I2 |
Enhanced Thermocouple Input Module |
6-channel isolated thermocouple inputs |
| 1756-EN2T |
Ethernet Communication Module |
Network connectivity for ControlLogix |
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