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TOP Server Real-Time Scheduler Plug-In - Available System Tags

For the TOP Server Scheduler Plug-In, what are the available system-level tags that can be monitored from a client application?

Schedule-Level System Tags

Syntax Example: _Scheduler.<ScheduleName>._Enable

 Tag Name  R/W Access  Description
 _Enable  Read/Write Reports the enabled / disabled state of a schedule. Writing a 0 to this tag disables the schedule.
 _InException  Read Only Reports 1 when a schedule is in exception time.
 _IsPolling  Read Only Reports 1 when a scheduled poll is being processed.
 _LastPollDurationSec  Read Only Indicates the amount of time (in seconds) the last poll took to complete. This tag is updated whether the poll succeeds or fails.
 _LastPollStart  Read Only Reports the time that the most recent poll began. All times are reported in local time. If no poll has started, the tag reports 01/01/1601 00:00:00.000.
 _LastPollEnd  Read Only Reports the time that the most recent poll finished. All times are reported in local time. If no poll has started, the tag reports 01/01/1601 00:00:00.000.
 _NextScheduledStart  Read Only Reports the time that the next upcoming poll is due to begin. All times are reported in local time.
 _LastPollSuccess  Read Only Allows external clients to determine whether the last poll was considered successful. A poll is considered a failure if the device is in error and a polled tag reports bad quality.
 _Priority  Read/Write Indicates the number indicating priority of the schedule. Writing a priority to this inserts the schedule at the specified priority and bumps lower priority schedules down.
 _PendingReads  Read Only Indicates the number of pending reads that must complete for a scheduled poll to finish.


Device-Level System Tags

Syntax Example: _Scheduler.<ScheduleName>.<ChannelName>.<DeviceName>._IsPolling

 Tag Name

R/W Access

  Description
 _Enable  Read/Write Reports the enabled / disabled state of a device. Writing a 0 to this tag disables the device.
 _Override  Read/Write Reports indicates whether a device is in override mode. Writing a 1 to this tag puts a device in override. While in override, the parent polling schedule is ignored and the device is polled according to the schedule’s override duration in the schedule properties.
 _IsPolling  Read Only Is 1 when a scheduled poll is being processed.
 _LastPollDurationSec  Read Only Indicates the amount of time (in seconds) that the most recent last poll took to complete. This tag is updated whether the poll succeeds or fails.
 _LastPollStart  Read Only Reports the time that the most recent poll began. All times are reported in local time. If no poll has started, the tag reports 01/01/1601 00:00:00.000.
 _LastPollEnd  Read Only Reports the time that the most recent poll finished. All times are reported in local time. If no poll has started, the tag reports 01/01/1601 00:00:00.000.
 _LastPollSuccess  Read Only Allows external clients to determine whether the last poll was considered successful. A poll is considered a failure if the device is in error and a polled tag reports bad quality.
 _Poll  Read/Write Allows external clients to issue on-demand polls by writing a value to the tag. Only tags defined for the device within the schedule are polled.
 _PendingReads  Read Only Indicates the number of pending reads that must complete for this device to finish.
 _SecondsInOverride  Read Only Indicates the time, in seconds, the device has been in override mode. The value is 0 if the device is not in override mode.