SCHNEIDER AS-B805-016 discrete input module

Schneider Electric AS-B805-016 115VAC Discrete Input Module – Full Product Overview

The AS-B805-016 from Schneider Electric is a 16-channel 115VAC discrete input module designed for Modicon 984 and 800-Series PLC systems. It serves as a reliable interface between field devices and the PLC, converting real-world ON/OFF signals into logic data for industrial automation control.

This module is widely used in legacy Modicon installations and remains a trusted solution for maintaining and upgrading existing automation systems.

Product Description

The Schneider AS-B805-016 is a high-performance digital input module that collects AC voltage signals from field devices such as switches, relays, and sensors. It ensures stable signal acquisition, electrical isolation, and protection in harsh industrial environments.

Designed to occupy a single slot in the Modicon I/O backplane, the module provides efficient space usage while delivering dependable performance in process and factory automation.

Key Features

• 16 discrete input channels
• Designed for 115 VAC field signals
• Compatible with Modicon 984 / 800 Series PLCs
• Optical isolation between field wiring and logic circuits
• Built-in fuse protection per input group
• High noise immunity for industrial environments
• Fast signal response and filtering
• Rugged construction for long-term operation

Technical Specifications

How the AS-B805-016 Works in a PLC System

In an automation system, the module acts as the signal gateway between field equipment and the PLC processor:

Field Device → Input Module → PLC Logic → Machine Control

Typical connected devices include:

• Push buttons and selector switches
• Limit switches and safety switches
• Proximity and position sensors
• Relay and contact outputs

The module detects the presence of AC voltage and converts it into internal digital signals that the PLC uses to execute control logic.

Protection and Reliability

The AS-B805-016 is engineered for industrial reliability:

• Optical isolation protects PLC electronics from field voltage spikes
• Built-in fuses safeguard input groups from overload conditions
• Designed to tolerate electrical noise and transient surges
• Fail-safe behavior ensures inputs turn OFF during communication loss

These features make the module ideal for mission-critical automation systems.

Typical Applications

This module is commonly deployed in:

• Manufacturing production lines
• Packaging and bottling machinery
• Material handling and conveyor systems
• Textile and processing equipment
• Power and utility control systems
• Maintenance of legacy Modicon PLC installations

Benefits for Industrial Automation

Choosing the AS-B805-016 helps extend the life of Modicon PLC systems while maintaining dependable input signal acquisition. Its robust design, simple integration, and proven reliability make it a practical solution for both replacement and system maintenance.

Conclusion

The Schneider Electric AS-B805-016 is a reliable 115VAC discrete input module built for Modicon 984 and 800 Series PLC platforms. With 16 channels, strong electrical protection, and industrial-grade durability, it remains an essential component for maintaining and operating legacy automation systems.