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ABB Bailey INNIS11 Symphony Network Interface Module Infi-90 PLC

Description

Each INFI 90 OPEN module establishes exception reporting routes for process inputs (points). Some examples of exception report parameters are high/low alarm limits, minimum/ maximum report time intervals, and percent of change in span. When a point changes more than a given parameter, or an alarm state changes, the module generates an exception report. The NPM module polls control modules (via the Controlway or module bus) for exception reports, and packages together the exception reports having a common node destination. Packing places all exception reports for a destination (or multiple destinations) into one message and the NIS module sends them to other INFI-NET nodes as a single message. This process reduces the number of transmissions required, and adjusts the message size for maximum INFI-NET loop efficiency

Exception reports can have data values in the following formats: Digital, analog, and status report. Exception reports are time-stamped to reflect their processing sequence. The maximum and minimum report time parameters insure that an exception report is generated for static or rapidly changing data. The minimum report time parameter controls the quantity of exception reports a single rapidly changing point generates. The maximum report time parameter generates a periodic report of data items that do not change.

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