Allen Bradley 1756‑L73K ControlLogix 5570 Standard Controller

Allen Bradley 1756‑L73K ControlLogix 5570 Standard Controller

Configured for chassis‑based controller execution in ControlLogix 5570 systems, the Allen Bradley 1756‑L73K (1756‑L73K controller) provides direct CPU processing, backplane communication, and nonvolatile storage for large‑scale discrete and analogue I/O deployments.

Hardware Specifications

Backplane Bus Communication Velocity & Firmware Flash Compatibility

Within ControlLogix architectures, the 1756‑L73K participates in deterministic backplane bus communication velocity governed by the ControlLogix backplane protocol. Its memory structure (8 MB user, 0.98 MB I/O) supports high‑density tag databases without scan‑time instability. The controller’s electrical profile—5 mA @ 1.2 V DC and 800 mA @ 5.1 V DC—maintains predictable loading across multi‑slot chassis configurations.

Firmware flash compatibility aligns with standard ControlLogix upgrade procedures. Stable backplane power and SD‑card availability ensure safe firmware transitions without requiring module‑specific adaptations. Conformal coating provides additional environmental tolerance without altering firmware behavior.

Frequently Asked Questions

Q: Can the 1756‑L73K be installed in any chassis slot A: Yes. It is chassis‑based and may be installed in any slot of supported 1756 chassis.

Q: Is the USB port intended for permanent operation A: No. The USB 2.0 port is for temporary programming only and must not be used in hazardous locations.

Q: Does the controller support removable energy storage modules A: Yes. Multiple capacitor energy storage module types are supported, including removable and non‑removable variants.

Field Installation Guidelines

Mount the controller in a supported 1756 chassis and verify correct seating of the energy storage module. Maintain separation between USB cabling and high‑voltage conductors. Follow conductor category 3 routing rules for the USB interface. Ensure environmental conditions meet temperature, humidity, vibration, and shock specifications. Avoid contamination sources and verify grounding according to industrial wiring guidelines.