GE Industrial Solutions Entellisys System User Manual - Manual (Page 140)

Digital I/O 140
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10.1.3.5 Operation
Discrete I/Os are closely tied with FlexLogic. Contact input states can be used as input data for a
FlexLogic equation and the results of FlexLogic execution can operate contact outputs.
Therefore discrete I/O boards are serviced in a synchronous manner, with the reading states of
contact inputs and writing states to contact outputs interleaved with the processing of FlexLogic
equations. This sequence is executed every half cycle, which corresponds to 8.333 ms and
10.000 ms for 60- and 50-Hz systems respectively. The response times of discrete I/Os are up to
12 ms and 14 ms for 60- and 50-Hz systems respectively, with the assumption that input
debouncing is disabled.
10.1.3.6 Contact input states
While CPUs are running they provide the current states of discrete inputs. To view this
information, click CI States in the Discrete Inputs/Outputs dialog box. The list contains all
configured discrete inputs with its corresponding user-friendly name and current state. The
information on the screen is a snapshot of the discrete inputs' states taken at the time the dialog
box was opened.
NOTE: In order to see the latest states of the inputs, the dialog box must be closed and
reopened.
Off means that the input is in low state and On indicates that the input is in high state.
Figure 10-10 Contact input states