OVERVIEW

Official designation: Allen-Bradley 1754-L28BBB (GuardPLC 1200 Series, Safety Controller)

Role/Application: A compact, packaged safety controller designed for industrial functional safety applications, meeting standards such as SIL 3 and PLe/Cat. 4.

KEY SPECS SUMMARY

Power: 24V DC Nominal Input

Interfaces / Ports: RS-232, Two-port Ethernet switch

Indicators: Status, diagnostic, and output LEDs

Operating Temp: Refer to the latest manufacturer manual.

Platform / Compatibility: GuardPLC 1200 Control System

Limit: 20 Digital Inputs, 8 Digital Outputs

Lifecycle: Discontinued by manufacturer

FREQUENTLY ASKED QUESTIONS

Technical Specifications:

Q: What is the confirmed user application code memory capacity of the 1754-L28BBB controller?

A: The safety controller is equipped with 500 KB of user application code memory and 500 KB of application data memory.

Wiring & Installation:

Q: What are the two primary methods recommended for mounting the GuardPLC 1200 controller in a panel?

A: The controller can be mounted either by snapping it onto a DIN rail or by using bolts for back panel mounting.

Troubleshooting & Compatibility:

Q: What safety standards does the Allen-Bradley 1754-L28BBB safety controller adhere to?

A: The controller is built according to IEC 61508 (SIL 3) and ISO 13849-1 (PLe/Cat. 4) standards.

Replacement & Upgrades:

Q: What is the power requirement, in terms of current, that the 24V DC power supply must deliver to the controller?

A: The power supply must deliver a minimum of 8 Amps to the 24V DC input of the controller.