Honeywell FS-SDI-1624 Digital Input Module

Configured for 16-channel binary signal acquisition in Honeywell Safety Manager systems, the Honeywell FS-SDI-1624 (FS-SDI-1624 Digital Input Module) provides direct physical/electrical execution.

Hardware Specifications

Galvanic Isolation and 4-20 mA HART Loop Protocol Integration

The module incorporates dedicated per-channel galvanic isolation barriers that electrically isolate individual field input circuits from backplane logic and adjacent channels. This isolation architecture blocks high-voltage common-mode surges, preventing field ground loops from compromising central processor safety execution. When deployed alongside analog safety loops carrying 4-20 mA HART loop protocol signals in the same enclosure, the isolated digital input channels prevent inductive switching transients from corrupting real-time process variable telemetry.

Frequently Asked Questions

Q: Does the FS-SDI-1624 support both internal and external 24 VDC field power sources?

A: Yes, field power distribution for the 16 input loops can be configured via internal rack power rails or supplied through external isolated 24 VDC power sources.

Q: How do the physical connector keying pins protect against incorrect rack insertion?

A: The chassis interface utilizes mechanical keying pins at positions A5 and C5 that align exclusively with matching coding holes on the FS-SDI-1624 module, preventing accidental installation into incompatible slot locations.

Q: What are the input voltage thresholds for logic state detection on this module?

A: An input signal voltage greater than 15 VDC registers as a logic HIGH state, while a voltage below 9 VDC (with current under 2 mA) registers as a logic LOW state.

Field Installation Guidelines

• Verify that chassis connector coding pins at positions A5 and C5 are correctly oriented before inserting the module into the 4 TE, 3 HE rack slot.
• Slide the module smoothly along the guide rails until the backplane connectors fully lock into the card cage receptacle.
• Fasten the top and bottom panel retention screws to ensure continuous mechanical chassis grounding.
• Route external 24 VDC field input wiring through designated low-voltage trunking, maintaining separation from high-voltage AC distribution circuits.