OVERVIEW

Official designation: Allen-Bradley 1794-IB8S (Flex I/O, Safety Digital Input Module)

A safety-rated module with 8 current-sinking 24V DC inputs, providing certified signal monitoring for dependable operation in safety control systems, conforming to safety standards.

KEY SPECS SUMMARY

Power: 120 mA @ 5V DC

Interfaces / Ports: 8 sinking inputs

Indicators: 10 LEDs total

Operating Temp: 0 to 55 degrees C

Platform / Compatibility: Flex I/O / Safety

Limit: SIL 3, Cat 4, PLe

Lifecycle: Active

FREQUENTLY ASKED QUESTIONS

Technical Specifications:

Q: What are the achieved safety integrity levels for the 1794-IB8S module?

A: This module meets the requirements for Safety Integrity Level 3, Category 4, and PLe.

Wiring & Installation:

Q: What is the minimum required on-state voltage to guarantee the input registers as high?

A: The input on-state minimum voltage is specified at 10V DC.

Troubleshooting & Compatibility:

Q: Which required terminal base unit provides the diagnostic capability for short circuit detection?

A: The 1794-TB3S safety terminal base is required for short circuit protection diagnostics.

Replacement & Upgrades:

Q: Is this safety input module a viable replacement for standard non-safety Flex I/O modules?

A: Yes, but it requires a safety controller and the appropriate safety terminal base unit for operation.