OVERVIEW

Official designation: Allen-Bradley 1753-L28BBBP (GuardPLC 1600 Series, Safety Controller)

Role/Application: A safety controller with 20 non-isolated digital inputs and 8 non-isolated digital outputs, supporting PROFIBUS DP Slave communication via RS-485 for reliable safety and process control.

KEY SPECS SUMMARY

Power: 24V DC, -15 to 20 percent range

Interfaces / Ports: Four Ethernet ports, one RS-485 port

Indicators: Status, diagnostic, and I/O LEDs

Operating Temp: 0 to 60 degrees C

Platform / Compatibility: GuardPLC system, DIN rail mountable

Limit: 250 KB program, 250 KB data memory

Lifecycle: Discontinued, refer to the latest manufacturer manual.

FREQUENTLY ASKED QUESTIONS

Technical Specifications:

Q: What are the current rating limits for the digital outputs on the 1753-L28BBBP controller?

A: Outputs 1 to 3 and 5 to 7 are rated for 0.5 A; Outputs 4 and 8 are rated for 1 A at 60 degrees C.

Wiring & Installation:

Q: What are the minimum required clearances for mounting the controller for effective cooling and operation?

A: A minimum gap of 100 millimeters (3.94 inches) is required above and below the controller for air circulation.

Troubleshooting & Compatibility:

Q: What safety time is specified for the controller's internal safety operations and fault response?

A: The minimum safety time for the 1753-L28BBBP controller is specified as 20 milliseconds.

Replacement & Upgrades:

Q: Can the RS-485 COMM 1 port be used for communication protocols other than PROFIBUS DP Slave?

A: The controller also supports Modbus RTU Slave communication and GuardPLC ASCII on an RS-485 port.