TriconeX 3504E

Nominal Turn-On 2-3 mA negligible

Typical Hysteresis 4 VDC 4 VDC/7 VDC

Input Delay 

 OFF to ON/ON to OFF < 2 ms/< 2 ms < 10 ms/< 10 ms

Minimum Point Isolation 1500 VDC n/a

Nominal Input Impedance > 3.0 KΩ > 30 KΩ

Nominal Field Power Load

Each 64-point digital input (DI) module 

has three isolated channels which independently process all data input to the 

module. A microprocessor on each 

channel scans each input point, 

compiles data and transmits it to the 

main processors on demand. Then input 

data is voted at the main processors just 

prior to processing to ensure the highest 

integrity.

All digital input modules sustain 

complete, ongoing diagnostics for each 

channel. A failure on any channel activates the Fault indicator which in turn 

activates the chassis alarm. A TMR 

module is guaranteed to operate properly in the presence of a single fault and 

may operate properly with certain kinds 

of multiple faults. 

All digital input modules support hotspare modules and require a separate 

external termination panel (ETP) with a 

cable interface to the Tricon backplane. 

Each module is mechanically keyed to 

prevent improper installation in a 

chassis.

The model 3504E High Density Digital 

Input Module continuously verifies the 

ability of the Tricon to detect transitions 

to the opposite state. On this TMR 

module, all critical signal paths are 100 

percent triplicated for guaranteed safety 

and maximum availability. Each 

channel conditions signals independently between the field and the Tricon.

The Single Digital Input Module

(model 3564) is optimized for safetycritical applications where low cost is 

more important than maximum availability. On single modules, only those 

portions of the signal path which are 

required to ensure safe operation are 

triplicated. Special self-test circuitry 

detects all stuck-ON and stuck-OFF 

fault conditions in less than half a 

second. If a single module detects an 

input fault, it reports that point as OFF, 

which may cause a glitch during 

switch-over to a hot-spare module.

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