Allen-Bradley 1756-L64 ControlLogix Logix5564 Processor

Configured for high-speed logic execution in ControlLogix networks, the Allen-Bradley 1756-L64 (1756-L64 Logix5564 Processor) provides direct physical/electrical execution. This hardware unit serves as the central control processor for modular I/O chassis, utilizing 16 MB of onboard memory to execute complex machine control tasks and synchronized data processing across the backplane bus.

Hardware Specifications

Profinet / EtherNet/IP Deterministic Networks

The 1756-L64 supports deterministic communication over EtherNet/IP and ControlNet backplane architectures. Backplane bus communication velocity is critical for maintaining task synchronization; users must ensure the firmware flash compatibility between the processor and any distributed I/O modules to prevent scheduling jitter. I/O density scaling is governed by the total packet rate limits of the processor, which requires careful management of task priority and connection overhead to maintain network determinism.

Frequently Asked Questions

Q: Does the 1756-L64 support hot-swapping?

A: Yes, the module is designed for removal and insertion under power (RIUP) within a powered ControlLogix chassis, provided that safety protocols for the specific machine application are observed.

Q: Is the 16 MB memory field-upgradable?

A: No. The memory capacity is integrated into the processor architecture and cannot be expanded or upgraded post-manufacture.

Field Installation Guidelines

• Slot Configuration: Install the processor in any available slot within the 1756 chassis, though Slot 0 is standard for primary controller placement to optimize backplane back-pressure management.
• Grounding: Ensure the chassis is firmly bonded to the equipment chassis ground. Use a low-impedance connection to prevent common-mode noise from affecting processor performance.
• Firmware Management: Before commissioning, verify the current firmware revision against the project requirements. Use the ControlFlash utility to update the firmware to ensure compatibility with installed I/O modules and communication bridges.
• Thermal Environment: Ensure the chassis installation provides clear airflow paths, as the processor generates heat during operation. Maintain ambient conditions within the specified 0 deg C to 60 deg C range.