Honeywell FC-TSDI-1624C Safe Current-Limited Digital Input FTA

Product Description

The Honeywell FC-TSDI-1624C is a 16-channel, 24 VDC safe current-limited digital input Field Terminal Assembly (FTA) for Honeywell FSC safety systems. It conditions field switch signals and connects to SDI-1624 safety digital input modules through a system interconnection cable. Its 250 mA fuse rating and low igniting current make it suitable for discrete inputs where current limitation is required.

Function and system role

The FC-TSDI-1624C provides the field wiring interface for safe digital inputs. It does not replace the I/O module; instead, it adapts field signals for the associated SDI-1624 input module. The FTA contains the necessary circuitry to convert field-side switching signals into levels compatible with the safety manager input unit.

Channel configuration and current limiting

The module provides 16 digital input channels arranged as two groups of eight. Each group is protected by a 250 mA fuse. The igniting current per channel is specified at less than 100 mA at 24 VDC +30 percent, while the maximum output current per fuse is 175 mA. These limits help reduce the risk of excessive current reaching field devices.

Connection to the safety I/O module

The FTA connects to one or a redundant pair of SDI-1624 modules via a system interconnection cable, SICC-0001/Lx. The cable plugs into the SIC connector on the FTA and routes the conditioned signals to the safety digital input module. Cable length is selected by the Lx suffix and should match the panel layout.

Electrical ratings and approvals

The input voltage is 24 VDC with an allowed range of -15 percent to +30 percent. Under normal conditions, each channel draws no more than 15 mA at 24 VDC. The unit carries CE, TUV, UL, CSA, and FM approvals, supporting use in safety-related applications where recognized certification is required.

Technical specifications

Frequently Asked Questions

Q: Which I/O module does the FC-TSDI-1624C connect to?
A: It connects to the Honeywell SDI-1624 safe digital input module, or to a redundant pair of SDI-1624 modules, using a SICC-0001/Lx system interconnection cable.

Q: What does the “current-limited” designation mean for this FTA?
A: Each group of eight channels is protected by a 250 mA fuse, with an igniting current below 100 mA per channel at 24 VDC +30 percent and a maximum output current of 175 mA per fuse. This limits the energy available to the field circuit.

Q: Can the FC-TSDI-1624C be used as a standalone input module?
A: No. It is an FTA, not a processor or I/O module. It must be used together with a compatible SDI-1624 safety digital input module and the correct SICC cable.

Other Attributes

• Series: Honeywell FSC 
• Country of Origin:  USA
• Lead Time: In Stock, 2 Working Days

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