Honeywell FC-SDIL-1608 | SIL 3 Loop-Monitored Digital Input Module

Description

Core Product Summary (Brand / Model / Key Attributes)

Honeywell FC-SDIL-1608 is a conformal-coated, loop-monitored Safety Digital Input module for the Honeywell Safety Manager system. It provides 16 input channels for NAMUR signals according to DIN 19234 and includes earth-fault monitoring for the connected input loops.

The module provides a short-circuit-proof 7.9–8.7 V loop supply rated at 170 mA for field devices. Its input switch level is 1.4–1.9 mA, with 0.2 mA ±0.05 mA hysteresis and a first-order 100 Hz low-pass input filter. It requires 5 VDC at 160 mA and 24 VDC at 110 mA, occupies 4 TE × 3 HE of rack space, and is documented with CE, TÜV, UL, CSA, and FM approvals. The module is specified for safety applications up to SIL 3 under IEC 61508.

Key Technical Specifications

Detailed Product Overview

The Honeywell FC-SDIL-1608 is a 16-channel digital input module used to acquire safety-related discrete signals in a Safety Manager installation. It is specifically designed for NAMUR-compliant inputs according to DIN 19234 and provides loop monitoring for the connected field circuits.

The module supplies a regulated, short-circuit-proof 7.9–8.7 V loop supply rated at 170 mA for the field circuits. Its input threshold is 1.4–1.9 mA, with a documented hysteresis of 0.2 mA ±0.05 mA. A first-order 100 Hz low-pass filter is applied to the input signal. The field-wire resistance limit is 50 ohms, which must be considered when calculating cable length, conductor size, and total loop burden.

A distinguishing feature of the FC-SDIL-1608 is its earth-fault monitoring. The module uses floating field sensors to check and indicate the connection status between the 2 × 16 input wires and ground. In zener-barrier applications, it checks whether the connection between the module’s 8 VDC supply and ground has been disconnected. Earth-fault monitoring requires a ground connection at module pin Z28 and activation of the monitoring function in software.

The module requires both 5 VDC at 160 mA and 24 VDC at 110 mA. For certain field-device types, Honeywell documentation specifies a BN-1608 or BSN-1608 converter module installed on the Px programming connector of the I/O backplane. The FC-TSDIL-1608 field termination assembly provides the field-interface function for the module. Its conformal-coated construction distinguishes the FC version from the non-coated FS-SDIL-1608 variant.

FC-SDIL-1608

FC-SDIL-1608

Engineering Selection Highlights

• The FC-SDIL-1608 provides 16 loop-monitored NAMUR inputs, making it suitable for Safety Manager applications requiring supervised discrete safety signals.
• Its integrated earth-fault monitoring can detect unintended ground connections in the input loops, but it requires the Z28 ground connection and software activation.
• The module supplies its own short-circuit-proof 7.9–8.7 V, 170 mA loop supply, so field-device power does not need to be derived from a separate 24 VDC field supply.
• Its 50 ohm field-wire-resistance limit constrains cable length and conductor sizing for each input loop.
• The 1.4–1.9 mA switch level and 100 Hz input filter define the electrical signal conditions for NAMUR sensors and monitored contact circuits.
• BN-1608 or BSN-1608 converter modules are required for the documented dry-contact and safety-proximity-switch connection arrangements.
• The module requires both 5 VDC and 24 VDC supplies and occupies 4 TE × 3 HE, which affects Safety Manager power and chassis-space planning.

Dimensions, Mounting & Connection Notes

System Compatibility & Integration Requirements

FAQ

What is the Honeywell FC-SDIL-1608?
It is a Honeywell Safety Manager conformal-coated, loop-monitored Safety Digital Input module with 16 NAMUR input channels.

How many input channels does the FC-SDIL-1608 provide?
It provides 16 loop-monitored digital input channels.

What type of field signals does it accept?
It accepts NAMUR signals according to DIN 19234. Dry contacts and certain safety proximity switches require the documented BN-1608 or BSN-1608 converter module.

Does the module provide power to field devices?
Yes. It provides a short-circuit-proof 7.9–8.7 VDC loop supply rated at 170 mA.

What is the input switch level?
The input switch level is 1.4–1.9 mA, with 0.2 mA ±0.05 mA hysteresis.

Does it monitor earth faults?
Yes. It monitors the connection status between the 2 × 16 input wires and ground. The function requires a ground connection at Z28 and activation in software.

What power supplies does it require?
It requires 5 VDC at 160 mA and 24 VDC at 110 mA.

What rack space does it occupy?
It occupies 4 TE × 3 HE, equivalent to 4 HP × 3U.

Which approvals are documented?
The module is documented with CE, TÜV, UL, CSA, and FM approvals.

Verification & Troubleshooting Notes

• Confirm the complete type designation, FC-SDIL-1608, before matching the module to a Safety Manager I/O configuration or spare-parts record.
• Verify that connected sensors and contact circuits are compatible with the module’s NAMUR input requirements and 1.4–1.9 mA switch level.
• For earth-fault monitoring issues, confirm that the Z28 ground connection is present and that earth-fault monitoring is enabled in the Safety Manager software configuration.
• Check total field-wire resistance against the 50 ohm maximum when input loops behave incorrectly or monitoring results are inconsistent.
• Verify the module’s 7.9–8.7 VDC loop supply and its 170 mA capacity when field devices do not operate or loop diagnostics indicate a supply-related condition.
• Confirm that the required BN-1608 or BSN-1608 converter is installed on the Px programming connector for dry-contact or safety-proximity-switch applications.
• Use Safety Manager diagnostics and Safety Builder configuration data to distinguish channel faults from FTA wiring, converter-module, loop-supply, or earth-fault-monitoring issues.
• Do not bypass loop monitoring, earth-fault monitoring, protective barriers, or safety-related grounding during commissioning or troubleshooting.