1. The Need for Speed: When you need a faster datalogger

2. Overview Compile Modes and Task Management
Hardware overview and measurement structure
Serving Data Examples

3. Compile Modes and Task Management

4. Compile Modes Sequential Mode Pipeline Mode
Each instruction executes in the order it appears in the program.
Pipeline Mode
Breaks up the program into tasks.

5. Sequential Mode Advantages
Programmer has flow control
Easy to read
Measurements tasks inside of a processing task (logic statement etc.)
InstructionTimes()

6. Control that manages access to limited resources
Semaphore
Control that manages access to limited resources
Main scan holds semaphore until complete
Slow scans release semaphore after each slice

7. Main Scan Timing: Sequential Mode
What is the downside of running the main scan at maximum speed

8. Sequential Mode: Skipped Scans
Main Scan = 5
Scan 1
Skipped Scan!
Scan 3
Skipped Scan!
Scan 4
Skipped Scan!
Main Scan = 10
Scan 1
Scan 2
Skipped Scan!

9. Slow Sequence
Run outside the main scan at lower priority
Sliced into the executing task when time is available
Up to 4 user defined slow sequence tasks
Autocalibration and the Watchdog task are slow sequence tasks

10. Sequential Mode: Slow Sequence
Main Scan
Scan 1
Scan 2
Slow Sequence
With a 5 sec main scan what is the minimum slow sequence scan rate?
What would happen if one slow sequence task took longer than 7 units?

11. Pipeline Mode Advantages
Faster
Simultaneous measurement and processing
Differentiate tasks
Ex: Delay()
Buffered
Measurement times fixed
Conserves power
CR300

12. Buffers
Each buffer is the amount of memory allocated to process one scan
The actual amount of memory depends on the program
Shares memory space with output tables (4 Mb)
Scan(10, sec,3,0)
Minimum of 2 buffers

13. Buffers
Good for programs that will occasionally have large processing requirements
Communications, Histogram, etc
Insufficient buffer depth will cause a buffer overflow, generating skipped scans
Only the main scan is buffered

14. Hardware: Analog terminals
Measurement Task
Hardware: Analog terminals
SE/Diff channels, VX, IX, U channels
Instructions
Voltage Measurements: VoltSE(), VoltDiff(),
Excitation: ExciteV()
Resistive Measurements: BrFull(), BrHalf()

15. Hardware: Digital Terminals
Processing Task
Hardware: Digital Terminals
Control, Pulse, U channels, RS232, CSI/O, Ethernet, CPI
Instructions
Serial I/O (SerialOut,SDI12, etc)
Conditionals (If..Then…Else)
Protocols: , FTP, SDI12, ModBus…
Calculations/ Output procesing

16. Task Priority Each instruction broken into tasks and queued
Interrupt driven
Task priority
Measurement Task
Processing Task
Analog Measurements
Processing
Excitation
Output
Pulse Counters
Serial I/0
Control ports
SDM

17. Pipeline Mode: Timing M P M P Main Scan = 10 Scan 1 Scan 2 Scan 3

18. Pipeline Mode: Buffers and Skipped Scans
Main Scan = 6
Scan 1
Scan 2
Scan 3
Scan 4
Scan 5 M P
Buffer
How many buffers are necessary to avoid skipped scans
PC2
PC4 PB4 PA4
PC1 PB1 PA1
PC2 PB2 PA2
PC5 PB5 PA5
Buffer Overflow!

19. Pipeline Mode: Slow Sequence
Processing and measurement broken up means it can fit into smaller slices
All measurements sliced in before any processing

20. Slow Sequence Timing: Pipeline Mode
Main Scan
Scan 1
Scan 2
Scan 3
Scan 4
Scan 5 M P
Slow Sequence M P
Scan 1
Scan 2
Scan 3
Scan 4
Scan 5 M P

21. Hardware overview and measurement structure

22. CR1000 Fastest Recorded Measurement
The Fastest the CR1000 can take a measurements and record the data without skipping Scans is approximately 100Hz
Approximately 1300uS for measurement time. The remaining time is allocated for processing ADC measurement values, background calibration tasks, and recording data.

23. CR6 Fastest Recorded Measurement
The Fastest the CR6 can take a measurements and record the data without skipping scans is approximately 250Hz
Approximately 1600uS for measurement time. The remaining time is allocated for processing ADC measurement values, background calibration tasks, and recording data.

24. CR300 Fastest Recorded Measurement
The Fastest the CR300 can take a measurements and record the data without skipping Scans is approximately 16Hz
Approximately 1400uS for measurement time.
The remaining time is allocated for processing measurement, buffering data, flash erase and flash write tasks.
Fast Measurement Slow to Record.
The CR300 Writes to flash and it is extremely slow compared the SRAM in other Dataloggers. Flash Requires erase events where as RAM you can overwrite individual bits.

25. CR1000x Fastest Recorded Measurement
The Fastest the CR1000X can take a measurements and record the data without skipping scans is approximately 333Hz
Approximately 1000uS for measurement time. The remaining time is allocated for processing ADC measurement values, background calibration tasks, and recording data.

26. Reps(Number of measurements on consecutive channels)
VoltDiff ( Variable , Reps , Range , Channel , RevDiff , SettlingTime , Fn1 , Mult , Offset )
VoltDiff ( Variable1 , 1 , Range , 1 , False , SettlingTime , Fn1 , Mult , Offset )
VoltDiff ( Variable2 , 1 , Range , 2 , False , SettlingTime , Fn1 , Mult , Offset )
VoltDiff ( Variable3 , 1 , Range , 3 , False , SettlingTime , Fn1 , Mult , Offset ) VS
VoltDiff ( Variable() , 3 , Range , 1 , False , SettlingTime , Fn1 , Mult , Offset )

27. RevDiff(Determines if inputs are reversed for a second measurement)
VoltDiff ( Variable , Reps , Range , Channel , RevDiff , SettlingTime , Fn1 , Mult , Offset )
VoltDiff ( Variable , 1 , Range , Channel , FALSE , SettlingTime , Fn1 , Mult , Offset ) VS
VoltDiff ( Variable , 1 , Range , Channel , TRUE , SettlingTime , Fn1 , Mult , Offset )

28. Fn1(Determines the lowest frequency that will be notched out by the sync filter.CR6,CR300,CR1000x) Integ(Time in microseconds to integrate. CR800,CR1000,CR3000)
VoltDiff ( Variable , Reps , Range , Channel , RevDiff , SettlingTime , Fn1 , Mult , Offset )

29. CDMs Increase the channel count of your dataloggers and allow you to make multiple measurements simultaneously with the datalogger, rather than multiplexing one measurement at a time.

30. Burst(Number of consecutive measurements on the same channel)
VoltDiff ( Variable , Reps , Range , Channel , RevDiff , SettlingTime , Fn1 , Mult , Offset )
Note: The Measurement Burst rate is determined by the Fn1 for the CR6 CR300 and CR1000x dataloggers. For the CR800,CR1000,and CR3000 the settling time parameter is used to determent the Burst rate.
VoltDiff ( Variable , 5 , Range , -1 , False , SettlingTime , Fn1 , Mult , Offset )

31. Serving Data Examples

32. Serving Data

33. FTP- Most commonly, FTPClient() is used to send data or image files from the datalogger’s local file system to a remote FTP server hosted by a computer or another datalogger
CR300 – Fast, Requires lots of RAM only 512KB available
CR1000 – Extremely Slow, 4MB of RAM available
CR1000X/CR6 – Fast, 4MB of RAM available

34. EmailRelay() Demonstration
Approximate time to process
CR seconds
CR seconds
CR seconds
CR1000X seconds

35. Speed Summary Pipeline Mode Measurement Hardware
CR1000 vs CR6 vs CDM
Data Storage Speed vs Measurement speed
Instruction parameters
Reps, Fn1, Settling time, Burst
Serving Data

36. Thank You