FOXBORO SY-0399095E SY-0303451D logic card

FOXBORO SY-0399095E SY-0303451D logic card

Single Digital Input Module ModelFOXBORO SY-0399095E SY-0303451D is a Single Digital Input Module, which is optimized for safety-critical applications where low cost is more important than maximum availability. On Single modules, only those portions of the signal path that are required to ensure safe operation are triplicated. FOXBORO SY-0399095E SY-0303451DSelf-test circuitry detects all stuck-On and stuck-Off fault conditions within the non-triplicated signal conditioners in less than 500 milliseconds. This is a mandatory feature of a fail-safe system, which must detect all faults in a timely manner and upon detection of a fault, force the measured input value to the safe state. Because the

FOXBORO SY-0399095E SY-0303451D controller is optimized for de-energize-to-trip applications, detection of a fault in the input circuitry forces to Off (the de-energized state) the value reported to the Main Processors by each channel. Although this module is fail-safe, it does not offer the same level of availability and reliability as a TMR module.

This figure is a simplified schematic for Models FOXBORO SY-0399095E SY-0303451D T, which are 16-point TMR Digital Input Modules without a self-test feature.FOXBORO SY-0399095E SY-0303451D

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