Micromod MOD: 30MLTraining Manual - Manual (Page 81)

6 PID Loop Lab
6.1 Foreword
Many processes involve flow control loops, whether they are in the food, pharmaceutical,
chemical, pulp & paper, mining or virtually any of the industries served by MODCELL
and MOD 30ML. This lab is designed to help you learn the basic features of the ViZapp
configurator, as well as how to easily learn/demonstrate configuration of a PID loop.
6.2 Objectives
In this lab we will design a simple flow loop with a 4-20mA signal from a dP transmitter,
a square root extractor, a PID control loop and a modulating control valve. The P&ID for
this loop looks like this:
Figure 6 .1.
Sample Flow PID
Loop
F E
F T
F Y F C
F C V
We will use the built-in analog input 2 of MOD 30ML for connecting the process variable
(FT). We will use the built-in analog output 2 for sending the output of the PID. We will
also build a display for this PID loop.
After completing this lab, you should:
• Be familiar with the ViZapp Designer's workspace, menus and toolbars
• Know how to create new workspace, project and instrument documents
• Know how to configure a MOD 30ML database using ViZapp Configurator for a
simple PID Control loop.
• Be able to setup communications for communicating to the MOD
30ML/MODCELL instrument from the PC.
• Be able to build a PID loop display for displaying and changing process and
operator parameters.
• Know how to compile and download the database to the instrument
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