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RDU Data Collection
System Overview
Slide 1
System Overview
* The RDU data system is, primarily, an RF-Tag-based
system.
* All process information and test results are written
to the RF-Tag
* The data collection PC, using a database, collects all
test results as well
Slide 2
System Overview
* The part's serial number and its
status (pass, fail, not tested) is
read from the RF-Tag
* If process data (gaging
information, shim call, etc) from
upstream stations is needed, it is
read from the RF-Tag
* After the machine completes its
work, all results are written to
the RF-Tag and to the central
database
Slide 3
Collection of Data
Data is guaranteed to be recorded on the RF-Tag as well as in the database.
Each individual data path (RF or database) is trustworthy and automatically verified.
Slide 4
Data Integrity - Database
Database transactions use a checksum to verify that data in the
database matches that in the station.
* The station PLC generates a checksum before it sends its data.
* The database generates a matching checksum that is transmitted back to the
station PLC after data collection.
* The PLC only accepts the transaction as complete if the two checksums
match.
Slide 5
Data Integrity - RF-Tag
RF-Tag reads and writes always include verification.
* Two RF-Tag read operations are always performed together, and the two
sets of data are compared to one another. The read operation is only
considered successful if the two sets of data match.
* After an RF-Tag write is completed, the data is read back from the RF-Tag
and then compared to the expected value. If there is any mismatch, the station
automatically repeats the write until it succeeds.
Slide 6
PLC to PC Interface
A simple, flexible, reliable tool (written in VB.NET) is used to collect data from
the Main PLC, and then send that data to the database.
Slide 7
Database Structure
Test results data is stored in a simple,
event-based format. Each completed
station cycle generates one basic
record.
A final summary of the most recent
basic records (one per station) is
created for each part at the end of the
assembly process.
The Reports Wizard constructs
summaries of this data, depending on
the purpose of the report.
Slide 8
Storage of Data and Redundancy
The line has complete data
redundancy because data is
stored to both the RF-Tag and
the database.
If the database fails, production
can immediately resume using
the RF-Tag system. No inproduction data is lost (the line
does not need to be cleared). At
the end of the process, data will
be read from the RF-Tag, then
stored to an alternate PC.
Slide 9