3,313 Copies Sold Through April 2017

$18, Includes Shipping and Handling (if ordered with the booklet)

The controller and process are shown as a signal flow diagram, not as graphical representations of a controller and process. The results are plotted as fast as the computer can calculate them (the blink of an eye with a fast computer). They are presented in a plot which does not move with time, and plots for up to four sets of test conditions may be shown simultaneously and printed. A Help menu describes exercises to illustrate the key points about control which are described in the booklet. The simulation will be for linear control except for valve nonlinearities, with the following parameters settable:

     Gain or Proportional Band
     Integral (Reset) Time or Integral (Reset) Rate
     Derivative Time
     Filter Time
     Process Gain
     Dead Time
     Two First Order Lags, or an Underdamped Quadratic

     Setpoint, in automatic
     Load Change, in automatic
     Controller Output, in manual

Controller Algorithms
     Interacting, or Noninteracting
     Derivative on Process or Derivative on Error
     Cascade Control
Valve Nonlinearities
     Dead Band
     Velocity Limiting


Version 1.0 (the first release) had some graphical inconsistencies. These have been fixed. For Version 1.1 the options to change the time scale and the number of calculation steps were added. Version 1.2 has the ability to add valve nonlinearities of Dead Band and Velocity Limiting. Version 2.0 added the option for cascade control and Version 2.1 (Jan., 2000) cleaned up some issues with it. Version 3.0 was issued 1 July, 2000 and is simply a 32-bit issue of Version 2.1. About four customers out of about 800 had had trouble installing the 16-bit version on 32-bit computers. Version 3.1 was introduced in November, 2005. It allows toggling of the yellow background color to white, prints the response curves in dashes to facilitate separation on monochrome printers, and does not require the default printer to be set before the program is started. Previous customers may e-mail me at for a free upgrade.


The demonstration software (1.7 MB) fits on WindowsTM 95 and higher. It shows everything, including the Help file, and allows you to print results. It does not allow you to change much. Only the following parameters are enabled: Setpoint, Controller Gain, Load Change and Manual Output. There is a README.TXT file available after you unzip it but before you install it. This process will allow you to decide which folder/directory to put it in. Do not put it where the unzipped files are. If you subsequently want the full-featured version there are two ways to get it:

1. I can e-mail you the upgraded file.
2. I can postal-mail you a CD.