Data Acquisition

The channel scan for this type of schedule can be triggered by• Time intervals from 1 second to months• Digital events (conditional on digital state)• Counter events (conditional on count value)The data collected from report schedules can be returned to the host, logged or displayed.Stand-alone devices typically define several reporting schedules (e.g. RA, RB, RC, RD,RX), one of which can be used only for host requests (RX).A polled schedule that is executed only in response to a special command is assigned aunique identifier. This schedule will only occur when:• The host sends the host request command• An alarm condition issues the host requestStatistical sub-schedules are used for repeated data acquisition from input channels atshort intervals, but produce statistical data such as the average, minimum, maximum etcat longer intervals. One or more statistical sub-schedules, each with a unique scheduleidentifier, are defined. By default, statistical sub-schedules are scanned at the maximumpossible rate unless a user-defined trigger is applied.The channel scan for this type of schedule can be triggered by• Time intervals from 1 second to months• Digital events (conditional on digital state)• Counter events (conditional on count value)Channels that are to be statistically sampled must include one or more channel optionsto indicate the statistic(s) that are required.Alarm schedules determine the rate at which one or more channels will be scanned tocheck if an alarm condition has been reached (see Alarms, below). Multiple alarmschedules, each with a unique schedule identifier, are defined. By default, alarmschedules are scanned at the maximum possible rate unless a user-defined trigger isapplied.The channel scan for this type of schedule can be triggered by:• Time intervals from 1 second to months• Digital events (conditional on digital state)• Counter events (conditional on count value)When a stand-alone device is connected to a host PC, added flexibility can be achievedby allowing the user to stop, and then resume an individual schedule or all of theschedules, as required. This allows the user to temporarily halt the data acquisitionprocess to check and/or change system parameters or the schedule triggers.