Honeywell FC-SDI-1624 Safe Digital Input Module

This safety-rated digital input module provides sixteen channels for monitoring field contact status. The FC-SDI-1624 delivers SIL 3 certified performance for Honeywell Safety Manager and FSC platforms. Its dual-channel architecture ensures fail-safe operation in emergency shutdown and fire and gas systems. This unit performs comprehensive self-tests every cycle to guarantee input integrity.

Input Characteristics and Safety Ratings

The FC-SDI-1624 accepts dry contact inputs from switches, pushbuttons, and relay contacts. Each input supports both normally open and normally closed configurations with line monitoring. The module employs dual redundant processing paths for each input channel. Furthermore, the internal diagnostics detect open-wire, short-circuit, and stuck-on faults continuously.

Parameter	Specification
Model Number	FC-SDI-1624
Product Type	Safe Digital Input Module
Number of Channels	16 safety-rated inputs
Input Type	Dry contact (NO/NC configurable)
Nominal Voltage	24V DC (18-32V operating range)
Input Current	5mA typical per channel
Line Monitoring	Open-wire and short-circuit detection
Safety Certification	SIL 3 (IEC 61508), PL e (ISO 13849)
Diagnostic Coverage	>99% for internal faults
Response Time	<10ms typical
Test Pulse Acceptance	1ms to 50ms
Status Indicators	Red/Green LEDs per channel

Physical Dimensions and Mounting Details

The FC-SDI-1624 measures 170mm wide, 130mm high, and 85mm deep. This safety module weighs approximately 1.0 kilograms and mounts directly onto standard DIN rails. The front panel provides a removable spring-clamp connector for all field wiring terminations. Each channel pair clearly marks its dual input terminals for proper connection. Additionally, the housing includes a locking mechanism that secures the module against vibration.

Energy Storage and Power Consumption

This safety module draws a maximum of 6.8 watts from the system backplane. The FC-SDI-1624 does not incorporate batteries or supercapacitors for energy storage. Instead, the module relies entirely on the Safety Manager backplane for its power supply. The efficient thermal design uses natural convection cooling for reliable operation. Consequently, this approach eliminates battery replacement while ensuring fail-safe performance.

System Integration and Diagnostic Features

The FC-SDI-1624 integrates seamlessly with Honeywell Safety Manager and FSC logic solvers. You can configure this module using Safety Builder engineering software for intuitive setup. The internal diagnostics continuously verify input switching integrity and communication health. Therefore, this safe digital input module provides dependable monitoring for critical safety instrumented functions.