OVERVIEW

Official designation: Allen-Bradley 1775-S4B (PLC-3, I/O Scanner Message Handling Module)

Role/Application: This module serves as an advanced I/O scanner for the PLC-3, providing four I/O communication channels and one RS-232-C channel for message handling, programming, and report generation.

KEY SPECS SUMMARY

Power: 2.7 Amps at 5 V DC

Interfaces / Ports: Four I/O channels, one RS-232-C

Indicators: Refer to the latest manufacturer manual.

Operating Temp: 0 to 60 degrees C

Platform / Compatibility: PLC-3 Series A controller

Limit: I/O capacity 2048 inputs/2048 outputs

Lifecycle: Discontinued/Obsolete

FREQUENTLY ASKED QUESTIONS

Technical Specifications:

Q: What is the rated weight of the Allen-Bradley 1775-S4B I/O Scanner Module?

A: The module's weight is approximately 4.60 pounds (2.10 kilograms).

Wiring & Installation:

Q: What are the primary communication speeds supported by the I/O channels on the 1775-S4B module?

A: The I/O communication channels support speeds of 57.6 Kbaud or 115.2 Kbaud.

Troubleshooting & Compatibility:

Q: Which other scanner modules are often used as direct hardware alternatives for the 1775-S4B in existing PLC-3 systems?

A: The 1775-S5 or 1775-SR5 scanner modules are compatible replacements within the PLC-3 architecture.

Replacement & Upgrades:

Q: What is the recommended long-term system upgrade path for installations currently using the obsolete PLC-3 system?

A: The primary recommendation for migration is to the modern Allen-Bradley ControlLogix automation platform.