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Data Logging
SECTION 11 Data Logging
179
11-7-2-5 Deadband
This allows the value of the expression to change within the percentage limit
without being logged. This is particularly useful when logging analogue values
that are subject to noise. Each sample is checked (when the value changes for
'On Change' sampling, or every log period for 'On Interval') against the last
logged value. While the value varies within the deadband, the values are
ignored. When the value exceeds the deadband limits the new value will be
logged. This may dramatically reduce file size, and ease analysis.
Entering a value of 0%, i.e. no dead band, will cause every sample to be
logged.
11-7-2-6 Trigger on change of value
This option is only used when the Sample Rate is set to 'On Change'. When
unchecked, every time the expression changes a new record is written. If a
record consists of many fields that may be read or calculated at different times,
a new record is written every time any one field changes. However, the
desired action may be to change several fields, and then log the new values to
a single record. To achieve this action, the 'Trigger on change of value' should
be checked for all fields within a record that may be read or calculated at
different times. Only when all checked fields have been changed is the record
logged. If however, while waiting for remaining fields to change before writing,
a field is changed for a second time, the record is written with all current field
values including unchanged fields, before the field value is changed for a
second time.
Note:
There is a risk when using fields with 'Trigger on change of value' checked that
the new value of a field may not actually change its value i.e. the new value
happens to be the same as the old value. Because the field has not changed,
the record is not written until the value is changed again. This can produce
unexpected results as fields with 'Trigger on change of value' unchecked are
written with their current values at the time of writing, not the value at the time
of initial change. This may also occur when a Deadband is used.
Содержание CX-Supervisor
Страница 1: ...CX Supervisor Software Cat No W10E EN 01 User Manual Software Release 3 1...
Страница 3: ...Copyright Notice 2...
Страница 16: ...15...
Страница 17: ...16...
Страница 27: ...Tip of the Day SECTION 1 Graphics Editor 26...
Страница 35: ...CX Supervisor Preferences SECTION 2 Pages 34...
Страница 79: ...Responding to Events SECTION 5 ActiveX Objects 78...
Страница 115: ...Printing the Graphics Library SECTION 7 Graphics Library 114...
Страница 181: ...Data Logging SECTION 11 Data Logging 180...
Страница 201: ...Examples SECTION 12 Databases 200...
Страница 243: ...Performance Monitor SECTION 16 Application Analysis Performance Monitor 242...
Страница 253: ...Using with Omron s CX Server OPC SECTION 17 Using CX Supervisor as an OPC Cli 252...
Страница 259: ...Creating a CX Supervisor Client application SECTION 18 Connecting to a remote CX 258...
Страница 263: ...Adding a Point Linked to a Parameter SECTION 19 Connecting to Omron Industrial 262...
Страница 271: ...Data Logging SECTION 20 Best Practices 270...
Страница 275: ...Configuring a Server PC running Windows NT or 2000 Appendix A Configuring a PC 274...
Страница 277: ...Appendix B Frequently Asked Questions 276...
Страница 296: ...Appendix B Frequently Asked Questions 295...
Страница 297: ...Appendix B Frequently Asked Questions 296...
Страница 298: ...Appendix B Frequently Asked Questions 297...
Страница 299: ...Appendix B Frequently Asked Questions 298...
Страница 333: ...Revision history 332...