Keeps data of a plc thread. Prio and ScanTime are input to the plc process
which starts all threads. The rest of the parameters are output from the
plc thread and updated periodically.

 Description of the plc thread.

 Priority of the plc thread.

 Deadline for the plc thread.

 Plc thread options.
 Specification of the action when the execution time exceeds
 the scantime.

 Scan time for the plc thread.

 Actual scan time for the last scan.

 Minimum actual scan time since start of thread.

 Mean scan time for last x cycles (x defined by 'ScanTimeMeanCount').

 Maximum actual scan time since start of thread.

 Number of cycles to base 'ScanTimeMean' on.

 Total number of cycles since start of thread.

 Actual execution time for last cycle (exlusive wait time).

 Total execution time since start of thread.

 Minimum execution time for a cycle since start of thread.

 Mean execution time since start of plc thread.

 Relation between mean execution time and supposed scan time(percentage).

 Maximum execution time for a cycle since start of thread.

 Number of cycles where exection is less than 1/8:th of 'ScanTime'.

 Number of cycles where exection is less than 1/4:th of 'ScanTime'.

 Number of cycles where exection is less than 1/2:th of 'ScanTime'.

 Number of cycles where exection is less than 'ScanTime'.

 Number of cycles where exection is less than 2 times 'ScanTime'.

 Number of cycles where exection is less than 4 times 'ScanTime'.

 Number of cycles where exection is less than 8 times 'ScanTime'.

 Number of cycles where exection is more than 8 times 'ScanTime'.

 Number of cycles where a cycle did not start on time.

 1/8:th of 'ScanTime'.

 1/4:th of 'ScanTime'.

 1/2:th of 'ScanTime'.

 1/1:th of 'ScanTime'.

 2/1:th of 'ScanTime'.

 4/1:th of 'ScanTime'.

 8/1:th of 'ScanTime'.

 Direct link.

 Absoulute time when 'ScanTimeMean' was last calculated.

 Used for timer-handling

 The process number is normally PlcProcess (1) for plc threads.
 In some IO system though, a plc thread should act as a
 separate IO process. This is done when an Agent, Rack or Card
 should be handled by several plc threads.

 If IsDefault is set, this thread will be inserted as default thread in
 PlcPgm objects when they are created.