Honeywell FC-SDI-1624 | Safety Manager Safe Digital Input Module

Description

Core Product Summary

The Honeywell FC-SDI-1624 is a fail-safe digital input module designed for integration within Honeywell Safety Manager system architectures. It provides 16 isolated digital input channels configured for 24 VDC process signals, facilitating high-integrity monitoring of field devices such as pushbuttons, limit switches, and safety sensors.

Featuring a fail-to-safe internal architecture, any component failure within the input stage results in a de-energized signal state passed to the central processor—the safe condition for normally energized safety loops. The “FC” prefix designates a conformal-coated module designed to withstand harsh atmospheric conditions and airborne contaminants in demanding processing environments. The module operates within the controller rack chassis, interfacing directly with Safety Manager backplane buses and dedicated Field Termination Assemblies (FTAs).

Key Technical Specifications

Detailed Product Overview

The Honeywell FC-SDI-1624 safe digital input module operates as a critical signal acquisition component in safety instrumented systems (SIS). By interfacing between field instruments and the primary Safety Manager control processors, it ensures process state changes are accurately captured and transferred without compromising loop safety.

The module’s input stage incorporates a fail-to-safe design philosophy. If an internal hardware fault occurs within the input sensing circuitry, the module automatically forces the channel output state to de-energized (off), triggering the defined trip condition in a normally energized safety loop. Continuous internal self-test routines run in parallel with signal processing to monitor hardware integrity without interrupting process execution.

Physical mechanical keying prevents accidental insertion into incorrect chassis slots, ensuring that pin assignments and voltage levels match system specifications. The conformal coating applied across the printed circuit board assembly protects conductive paths from moisture, chemical vapors, and particulate accumulation common in industrial automation enclosures.

FC-SDI-1624

FC-SDI-1624

System Compatibility & Integration Requirements

Dimensions, Mounting & Connection Notes

• Space Allocation: Occupies 4 TE width and 3 HE height (4 HP, 3U eurocard format) inside the Safety Manager rack.
• Mounting Method: Direct slot insertion into designated Safety Manager controller/I/O rack backplanes.
• Keying Coding: Factory connector keying utilizes hole positions A5 and C5 to prevent improper module substitution.
• Handling Protocols: Standard electrostatic discharge (ESD) practices must be maintained during installation and removal to protect logic circuits. Ensure backplane edge connectors are fully seated prior to locking retention mechanisms.

FAQ

• What is the Honeywell FC-SDI-1624?

  It is a 16-channel, fail-safe digital input module engineered for Honeywell Safety Manager systems.

• What does the “FC” prefix indicate?

  The “FC” prefix indicates that the module features factory conformal coating for environmental protection. The non-coated variant is designated as FS-SDI-1624.

• What is the nominal input signal voltage?

  The module is designed for 24 VDC digital input signals, with a maximum allowable input voltage of 36 VDC.

• How does the module handle component failures?

  The input stage uses a fail-to-safe design where internal component failures cause the signal to default to a de-energized (safe) state.

• What are the input HIGH and LOW voltage thresholds?

  An input HIGH state is recognized above 15 VDC, while an input LOW state is recognized below 9 VDC (current < 2 mA).

• What mechanical space does the module require in the rack?

  It requires 4 TE width and 3 HE height (4 HP, 3U standard rack dimensions).

Documented Performance Data