128275-01  BENTLY NEVADA  Digital Input Module

3500 System Configuration software facilitates programing “Alarm Drive Logic” that controls relay actuation. This logic can be based on various combinations of alarms, ranging from an individual channel’s Alert, Danger, or NOT OK status to highly complex Boolean expressions that combine two or more channel By adding the required number of relay modules to the rack, it is possible to provide individual relay contacts for each channel, alarm type, and group of channels for global alarm annunciation. The 3500 Rack supplies an overall Rack OK relay in addition to any alarm relays in the rack. The Rack OK relay is in the TDI’s I/O module and is connected to the OK circuits of all modules in the rack. These OK circuits monitor the operating condition of each module. Any fault in the module, its transducers, or associated transducer field wiring will be annunciated by the Rack OK relay. This relay is a single-pole, double-throw (SPDT) type and is normally energized, providing added capability of annunciation in the event of primary power loss.

The 3500/25 is a halfheight module that provides power and termination for up to two Keyphasor transducers. When applications require one or two Keyphasor transducers, simply install a single 3500/25 module. The 3500 System can accommodate up to four Keyphasor transducers per rack by installing two 3500/25 Keyphasor modules in the rack.

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