Product Introduction
The Allen Bradley 1756-L55 ControlLogix Logix5555 Processor is a high-performance programmable automation controller (PAC) designed for the ControlLogix platform, optimized for advanced industrial automation tasks. It serves as the central processing unit (CPU) for real-time control, data acquisition, motion control, and communication with I/O modules and networked devices.
The L55 processor is engineered for medium-to-large scale automation applications, providing deterministic execution and high reliability. Its compact footprint and lightweight design allow efficient installation within standard ControlLogix racks while maintaining robust performance under typical industrial operating conditions.
With precise current control and integration into the ControlLogix backplane, the 1756-L55 ensures stable operation and seamless communication with distributed I/O and specialty modules, making it suitable for complex manufacturing, process control, and machinery automation systems.
Product Specifications
| Parameter |
Specification |
| Model |
1756-L55 |
| Manufacturer |
Allen Bradley |
| Product Type |
Logix5555 Processor |
| System Compatibility |
ControlLogix Platform |
| Mounting Type |
ControlLogix chassis backplane |
| Backplane Current @ 5 VDC |
6.31 mA |
| Backplane Current @ 24 VDC |
14 mA |
| Electrical Isolation |
Standard isolation for backplane integration |
| Dimensions |
145.2 x 34.6 x 139.6 mm |
| Weight |
0.34 kg |
| Operating Temperature Range |
0 to 60°C (32 to 140°F) |
| Power Dissipation |
Typical low power module suitable for compact systems |
Applications
● Central processor for medium-to-large industrial automation systems.
● Real-time execution of control logic, data acquisition, and motion control routines.
● Integration with ControlLogix I/O modules, specialty modules, and communication interfaces.
● Used in manufacturing plants, process control facilities, and machinery automation.
● Supports deterministic operation for safety, sequencing, and process monitoring applications.
● Suitable for systems where compact and low-power CPU modules are preferred.
Advantages
● Compact and lightweight design allows efficient use of chassis space.
● Deterministic execution supports reliable real-time control.
● Low backplane current reduces overall power consumption.
● Seamless integration with other ControlLogix modules ensures flexible system expansion.
● Supports standard industrial temperature range (0–60°C) for stable operation.
● Suitable for mid-range control applications where cost-effective high performance is required.
FAQ
1. What is the primary function of the 1756-L55?
It serves as the central processor for ControlLogix systems, executing real-time control, data acquisition, and automation logic.
2. How much current does it draw from the backplane?
It draws 6.31 mA at 5 VDC and 14 mA at 24 VDC, ensuring efficient power usage.
3. Can it execute complex control programs?
Yes, it supports deterministic execution for sophisticated logic, motion control, and process monitoring tasks.
4. Is it compatible with other ControlLogix modules?
Yes, it integrates seamlessly with digital, analog, motion, and communication modules within the ControlLogix architecture.
5. What operating temperature range does it support?
The module operates reliably between 0 to 60°C (32 to 140°F).
6. Does it provide electrical isolation?
Yes, it provides standard isolation for backplane communication and module operation to protect system integrity.
7. Is it suitable for real-time control applications?
Yes, the L55 provides deterministic execution suitable for time-critical industrial processes.
8. Can it handle network communication and integration?
Yes, it supports integration with ControlLogix communication modules for Ethernet, DeviceNet, or other industrial protocols.
9. Can it be used in redundant or high-availability systems?
Yes, when combined with redundant backplanes and communication modules, it supports high-availability configurations.
10. What types of industrial applications is it best suited for?
It is ideal for manufacturing automation, process control, machinery monitoring, and systems requiring reliable real-time control with mid-range processing needs.
Related Models
| Model |
Description |
Key Technical Data |
| 1756-L1M2 |
Logix5550 Processor |
1 MB memory, advanced CPU module |
| 1756-L55 |
Logix5555 Processor |
Mid-range high-performance CPU |
| 1756-L73 |
Logix5550 Processor |
Expanded memory and 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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