Honeywell FC-TSAI-1620M Analog Input Field Termination Assembly

The Honeywell FC-TSAI-1620M is a 16-channel analog input Field Termination Assembly (FTA) for the Safety Manager system. It interfaces field transmitters with the SAI-1620m safe high-density analog input module, converting 0(4)-20 mA field-current signals into voltage signals for input processing. It also distributes power to passive transmitters, limits transmitter-loop current, and monitors the external supply.

Functional Description

The FC-TSAI-1620M provides the field wiring interface for analog signals used in safety-related and non-safety-related applications. Its 16 input channels are arranged in two groups of eight, with a common 0 V connection within each group.

Each channel uses a precision input resistor to convert the incoming field current into a voltage signal for the associated SAI-1620m module. The assembly therefore performs signal conditioning and field termination rather than the analog-to-digital conversion performed by the input electronics.

Transmitter Connections and Signal Conditioning

The FTA supports 0-20 mA and 4-20 mA current-loop signals. Active transmitters can supply their own loop current, while passive transmitters require power distribution through the FTA.

For passive transmitter connections, the assembly provides a 30 V DC external supply path with voltage and current limitation. External power is not required when all connected inputs use active transmitters. When passive transmitters are used, the external supply must be available for the associated input loops.

Technical Specifications

System Connection and Installation

The FC-TSAI-1620M connects to the SAI-1620m through the SICC-0001/Lx system interconnection cable, which plugs into the FTA's SIC connector. The field wiring uses screw terminals, with a dedicated shield connection for each analog input channel.

The assembly supports snap-in mounting on standard DIN EN rails. Its two groups of eight channels have separate 315 mA fuse protection for transmitter power distribution. The external power circuit also supports monitoring through the associated SAI-1620m module.

Hazardous Area Applications

The TSAI-1620m is specified for non-incendive field circuits in Class I, Division 2 applications. The external transmitter supply is current-limited through series resistors. Actual field installation must comply with the applicable hazardous-area circuit parameters and system documentation; this designation should not be interpreted as an intrinsic safety certification.

Frequently Asked Questions

Q: Which analog input module is compatible with the FC-TSAI-1620M?

A: The specified associated input module is the Honeywell SAI-1620m safe high-density analog input module. The connection uses the SICC-0001/Lx system interconnection cable.

Q: Does the FC-TSAI-1620M require an external 30 V DC supply?

A: Not when all connected transmitters are active. Passive transmitter loops require external power to operate. The Safety Manager application must monitor the external supply voltage through the SAI-1620m when safety-related signals are connected.

Q: Can the FC-TSAI-1620M be used in Class I, Division 2 hazardous locations?

A: Yes. Honeywell specifies the TSAI-1620m for non-incendive field circuits in Class I, Division 2 applications. The applicable loop inductance, capacitance and installation restrictions must also be observed.