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High Speed Thermocouple Application:
In some applications, maximum speed of thermocouple measurement is desired.
The Thermocouple icon is one of the slowest to process in a Program Net due to the
intensive math associated with each sample. A Cold Junction Compensation
reading is required as well as the thermocouple reading, then the two are combined
through curve approximating polynomials... heavy math for the OMP-MODL.
A method to improve on the throughput rate of thermocouple inputs exists. If the
thermocouple inputs are read as mV signals (which are processsed very quickly) and
the CJC is read as a resistance (which is lots faster than temperature), the net will
process many times faster. The mV readings from the Thermocouple icon and the
resistance reading from the CJC icon are then merged in a Post-Processing Net and
the results (in degrees) are put into a destination *.HLD file for plotting.
The following Program Net represents an application of this method of high speed
thermocouple temperature data collection. Temperature rise data on components
within an automobile brake is desired. Thermocouples are installed and connected
to OMP-MODL input channels configured as mV inputs. The CJC input is sent to
memory in units of OHMS.
A unique triggering scheme is implemented with the Event icon and three Sample
Rate Clocks. One Sample Rate Clock causes the Event icon to sample the status of
a switch connected to the brake pedal every 10mS. When the switch is open (ie
brakes NOT activated) the CJC icon is enabled and the Sample Rate Clock sends a
reading to memory every second. Additionally,. the 50mS Sample Rate Clock is
sampling at its primary rate which is set to 1 second.
When the brake pedal is depressed, the CJC icon is disabled and the 50mS Sample
Rate Clock driving the three Voltage icons (thermocouple inputs) switches to its
Alternate rate, storing readings to memory every 50mS.
After the data has been collected and downloaded to the PC, a Post-Processing Net
is constructed as shown in the following diagram.
Summary of Contents for OMP-MODL
Page 1: ......
Page 9: ...1 INTRODUCTION USING THE MODULOGGER 1 7 13 ...
Page 23: ...2 OMP MODL System Base Using the OMP MODL 2 14 NOTES ...
Page 24: ...2 ModuLogger System Base Using the ModuLogger 2 1 ...
Page 30: ...3 INTERFACE MODULES USING THE OMP MODL 3 6 NOTES ...
Page 70: ...3 INTERFACE MODULES USING THE OMP MODL 3 46 NOTES ...
Page 76: ...3 INTERFACE MODULES USING THE OMP MODL 3 52 NOTES ...
Page 82: ...3 INTERFACE MODULES USING THE OMP MODL 3 58 NOTES ...
Page 83: ...3 INTERFACE MODULES USING THE MODULOGGER 3 1 ...
Page 105: ...5 HYPERCOMM COMMUNICATIONS USING THE OMP MODL 5 18 NOTES ...
Page 106: ...5 HYPERCOMM COMMUNICATIONS USING THE MODULOGGER 5 1 ...
Page 117: ...6 PCMCIA CARD CONFIGURATION AND USE USING THE MODULOGGER 6 1 ...
Page 134: ...7 HYPERNET ICON BASED PROGRAMMING USING THE OMP MODL 7 17 NOTES ...
Page 141: ...8 P P C D U OMP MODL ...
Page 149: ...9 HYPERPLOT GRAPHIC DATA DISPLAY USING THE OMP MODL 9 8 ...
Page 161: ...10 HYPERTRACK REAL TIME DATA DISPLAY USING THE OMP MODL 10 12 NOTES ...
Page 162: ...10 HYPERTRACK REAL TIME DATA DISPLAY USING THE OMP MODL 10 1 ...
Page 163: ...11 APPENDICES USING THE OMP MODL 11 1 11 APPENDICES ...
Page 164: ...11 APPENDICES USING THE OMP MODL 11 2 NOTES ...
Page 270: ...11 APPENDIX A MASTER ICON FILE REFERENCE USING THE OMP MODL 11 108 ...
Page 276: ...11 APPENDIX C HYPERWARE FILE LISTING USING THE OMP MODL 11 114 NOTES ...
Page 278: ...11 APPENDIX C HYPERWARE FILE LISTING USING THE OMP MODL 11 116 NOTES ...
Page 279: ......
Page 282: ...11 APPENDIX E CHANGING THE OMP MODL EPROM USING THE OMP MODL 11 120 NOTES ...
Page 288: ...11 APPENDIX G HYPERNET THEORY OF OPERATION USING THE OMP MODL 11 126 NOTES ...
Page 290: ...11 APPENDIX I RS 232 CABLE PORT AND ADAPTER USING THE OMP MODL 11 128 NOTES ...
Page 297: ...11 APPENDIX K MODEM CONFIGURATION USING THE OMP MODL 11 135 ...