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Description
Overview
Essential details：FC-SDI-1624 Safe digital input FTA
Field termination assembly module TSDI-1624 is the interface between system interconnection cable SICC-0001/Lx and the external field wiring (screw terminals). The SICC cable interconnects the SIC connector on the FTA module and a (redundant pair of) SDI-1624 modules.
The TSDI-1624 module can interface with digital input signals from ‘Class I, Division 2 Hazardous Locations’.
The TSDI-1624 module can handle short circuits to 0 Volt of (INx+ or INx) field wires because the PTC (Positive Temperature Coefficient) resistor between the +24Vout of the SDI-1624 modules and the ‘+24Vout’ connection (INx+) of each input channel limits the current. This prevents the loss of all 16 channels (+24Vout fails) in the case of a single short circuit to 0 Volt of a connected field wire.
The FTA module has a universal snap-in provision for standard DIN EN rails and screw terminals for connecting field wiring.
FC-SDI-1624
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FC-SDI-1624 Safe digital input FTA
Prefix used to identify conformal-coated module from non conformal coated modules. See also: FS.
• FC-SDI-1624 is a safe digital input module with conformal coating
• FS-SDI-1624 is a safe digital input module without conformal coating
Field Termination Assembly (FTA) Assembly to connect field wiring to the SM chassis IO modules. Field value
The value of a process point as present at the interface of the system with the EUC.
Fieldbus
Wiring solution and communication protocol in which multiple sensors and actuators are connected to a DCS or SIS, using a single cable.
Fire and Gas system
Independent protective system which continuously monitors certain process points (e.g. combustible gas levels) and environmental points (e.g. heat, smoke, temperature and toxic gas levels). If any of these points exceed a predetermined level, the system will raise an alarm and take automatic action to close operating valves and damper doors, activate extinguishers, cut off electrical power and vent dangerous gases.
Force
A signal override of some sort that is applied on a system level. A force applied to an input affects the input application state as it overrides the actual field value and diagnostic state of the forced input.
A force applied to an output affects the output field state as it overrides the application value or diagnostic value with the forced value.
