The Allen-Bradley 1772-LN2, also cataloged as the 1772LN2 CPU Module, operates as a dedicated hardware component for central logic processing and 1024-word memory execution within PLC-2 system architectures.

Architecture Classification & Memory Profile

• Primary Catalog Number: 1772-LN2
• Alternate Part Number: 1772LN2
• System Series: PLC-2 Enhanced Platform
• Memory Configuration: 1024 Word RAM Internal Capacity

Technical Parameters & Electrical Specifications

Deterministic Memory Execution & Expansion Scaling

The 1772-LN2 processes sequential ladder logic routines out of its 1024-word RAM array while directly controlling integrated discrete channels. Maintaining stable backplane bus communication velocity across local rack extensions enables real-time synchronization between the central logic processor and attached field devices while ensuring internal firmware flash compatibility during program scans.

Package Dispatch Summary

• 1 x 1772-LN2 PLC-2 Enhanced CPU Module
• 1 x Physical Installation Guide Sheet

Panel Installation & Field Wiring Standards

• Power Isolation: De-energize the main 24 VDC supply rail prior to inserting or seating the CPU module in the chassis frame.
• Signal Wiring Protocol: Wire external discrete field devices to the on-board terminal strip using copper conductors with appropriate strain relief.
• Shield Grounding: Ground the chassis frame to the main control enclosure grounding bar using low-impedance copper grounding straps.

Frequently Asked Questions

• Q: What is the onboard RAM memory capacity of the 1772-LN2 processor?

  The 1772-LN2 contains 1024 words of integrated volatile RAM for ladder logic program and data table storage.

• Q: What power input specs are required to operate the 1772-LN2 module?

  The unit requires a 24 VDC input supply (+/-15%) drawing up to 1.2 A operating current.

• Q: What built-in I/O point density is provided directly on the CPU hardware?

  The module features 16 discrete DC inputs and 12 relay outputs integrated onto the physical housing.

• Q: What is the isolation voltage rating between the field I/O circuits and core logic?

  Galvanic isolation is factory-rated at 1500 VAC between field-side I/O circuits and internal logic ground.

• Q: What are the contact load ratings for the integrated relay outputs?

  Relay outputs support continuous switching loads up to 2 A at 30 VDC and 0.5 A at 120 VAC.

• Q: Can the 1772-LN2 CPU module be inserted or removed under live power?

  No, power to the rack chassis must be turned off before module installation or removal to avoid hardware damage.

• Q: How many expansion chassis can be connected locally to the 1772-LN2?

  The CPU supports direct expansion to 1 local I/O chassis for additional system channel capacity.

• Q: What storage temperature range can the unit tolerate during transit?

  Storage ambient limits range from -40 to +85 deg C in non-condensing environments up to 95% relative humidity.