Addressing Control Applications Using Wireless Devices

How Wired and Wireless Transmitter Installations Differ in Closed-Loop Control Applications and What Changes Are Required in the PID

Share Print Related RSS
Page 4 of 4 1 | 2 | 3 | 4 Next » View on one page

Figure 14 – Stripper column pressure control – wired vs. wireless using PIDPlus

 

Field Evaluation of Wireless COntrol at UT
Table 2 – Field Evaluation of Wireless Control at UT

Conclusions

Field experience using WirelessHART in control applications may be summarized in the following manner:

  • WirelessHART measurements may be used in closed-loop control applications.
    – Window communications mode minimizes power consumption
  • PIDPlus is a standard feature of DeltaV and works with standard WirelessHART devices.
    – Standard DeltaV Tools support simulation and tuning
  • The performance of PIDPlus in a wireless control network is comparable to PID with wired inputs.
    – PIDPlus handles lost communications better than conventional PID. 
  • PIDPlus tuning depends only upon process dynamics, not on wireless update rate.

For best control performance process disturbances, the guideline provided for update period should be observed. If disturbance response is not critical, then a slower update period may be used.


References
PID Advances in Industrial Control, IFAC Conference on Advances in PID Control PID'12, Brescia, Italy, March 28-30, 2012. http://pid12.ing.unibs.it/sp_blevins.html.
DeltaV v11 PID Enhancements for Wireless, DeltaV Whitepaper, August, 2010, http://www2.emersonprocess.com/siteadmincenter/PM%20DeltaV%20Documents/Whitepapers/WP_DeltaV%20PID%20Enhancements%20for%20Wireless.pdf.
WirelessHART Successfully Handles Control, Chemical Processing, January, 2011, http://www2.emersonprocess.com/siteadmincenter/PM%20Articles/WirelessHART%20Successfully%20Handles%20Control.pdf.
Wireless – Overcoming Challenges of PID Contro l& Analyzer Applications, InTech, July/August, 2010, http://www.isa.org/InTechTemplate.cfm?template=/ContentManagement/ContentDisplay.cfm&ContentID=83041.
PIDPlus, An Enhanced PID Control Algorithm for Wireless Automation, AS-74.3199 Wireless Automation, Aalto University, Finland, http://autsys.tkk.fi/intranet/as-0.3200/attach/S09-19/loppuraportti.pdf.
Incorporating Wireless Devices into Single-Use Disposable Bioreactor Design, 2009 Dhirubhai Ambani Life Sciences Symposium, http://www.modelingandcontrol.com/Wireless-Devices-in-Single-Use-Bioreactors.pdf.
Improving PID Control with Unreliable Communications, ISA EXPO Technical Conference, 2006, http://www.automation.com/pdf_articles/10_improving_pid.pdf.
Similarity-based Traffic Reduction to Increase Battery Life in a Wireless Process Control Network, ISA EXPO2005, Houston, TX, www.cs.utexas.edu/~sjp/publications/isa06.doc
Page 4 of 4 1 | 2 | 3 | 4 Next » View on one page
Share Print Reprints Permissions

What are your comments?

You cannot post comments until you have logged in. Login Here.

Comments

No one has commented on this page yet.

RSS feed for comments on this page | RSS feed for all comments