ABB Bailey IMDSO14 Infi 90 Control Symphony Digital Output Module

Output Control Logic

An output register holds the data that controls the outputs. The I/O expander bus interface writes control module data to this register. This data, sent to the data selector, determines the output states (ON or OFF). Default data from the control module is sent to the default register. The control module configuration sets the default values (Function Code 128).

The default register is reset to logic zeros during power up to drive the outputs to a de-energized state. FC 128 in the control module configuration selects the output values used to drive the output circuits in the event of a control module failure (time-out). If FC 128 is not defined, the outputs will go to a de-energized state during a time-out. Refer to BUS FAULT TIMER in this section for further explanation of time-out

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