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7-1
7. Changing Controller Mode
and Using Autotune
7.1 Introduction
The CN8-SW system provides operators with an easy, reliable way of changing a
controllerÕs mode without using the unitÕs front panel. This ability to change mode
includes placing the controller in Autotune. Before putting a controller in Autotune, be
sure to read the manual supplied with the controller. Autotune will not work correctly
unless you prepare the process and the controller as described in the controller manuals.
7.2 Procedure
To change a controllerÕs mode:
1. While logged in as MULTI (or another operator with View/Change Parameters
privileges), select the controller by clicking on its image in the main graphic display.
The border of the controller will be highlighted.
2. Select Controller | Standby (or Manual or Tune). (If you attempt to put the
controller into Autotune mode, a confirmation message will be displayed. Before
using Autotune, you should read the manual supplied with the controller and comply
with the Autotune guidelines provided in that manual. After you acknowledge the
confirmation message, the Autotune command will be sent to the controller.)
3. The image of the controller on the main display will match the controllerÕs display in
the new mode. For example, in Standby mode the PV value will alternate with the
message ÒStbYÓ as shown in the following picture (see the ÒZone 4Ó controller).