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PID Loop Tuning

In your recent "How Software Tools Simplify Loop Tuning" article [Control Engineering, Nov. 1997, p. 89] you imply that ExperTune connects only to PLCs. ExperTune has a DDE connection that connects directly to Fisher/Provox (via SIU, HDL), Honeywell TDC systems (using GUS workstations), and Bailey DCS (via SIU).

By John Gerry February 1, 1998

In your recent “How Software Tools Simplify Loop Tuning” article [ Control Engineering , Nov. 1997, p. 89] you imply that ExperTune connects only to PLCs. ExperTune has a DDE connection that connects directly to Fisher/Provox (via SIU, HDL), Honeywell TDC systems (using GUS workstations), and Bailey DCS (via SIU). For single-loop controllers ExperTune also has a standalone data acquisition unit, that periodically samples analog values of process and control variables directly from the controller’s I/O ports.

You fairly assess that “ExperTune does all the work.” You did not mention that ExperTune has advanced analysis available: power spectra and auto/cross correlation, Bode plots, and first or second order filter design.

Author Information
John Gerry, president, ExperTune Inc., Hubertus, Wis.