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Fieldbus diagnostics, without fieldbus

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Digital fieldbuses are often justified on the basis of the benefits of advanced diagnostics. This paper investigates alternative technologies to capture diagnostics, without replacement of any field devices. The alternative method is field-proven and costs a fraction of the cost of fieldbus.

From Expertune

Diagnostics of field bus will be compared to the diagnostics of this new alternative including these diagnostics:

• Field equipment diagnostics for valve performance
• On-line oscillation detection
• Controller output noise band
• Output standard deviation
• How long the output is at a limit
• Percent of time is the loop in a normal mode
• Percent of time the loop is oscillating
• Percent of time the loop is oscillating because of valve
  stiction

File Size: 28 KB
File Type: PDF

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