Micromod MOD: 30MLTraining Manual - Manual (Page 199)

13 Supervisory Message Lab
13.1 Foreword
The Supervisory Message block is a function block that sends or receives messages based upon
being triggered via a “send” source input transition from 0 to 1, or the send command being issued
via operator write.
It is used to send a single message over the ICN to another controller or internally (within the MOD
30ML or MODCELL) to an addressable attribute. Some attributes, such as controller mode, can
only be written to via a supervisory message.
13.2 Objectives
This lab is a continuation of the Sequence lab and builds on the database constructed to control the
batch. In that lab, the sequence logic sends new setpoint values and control modes to a Temperature
Controller which was not actually present in the database.
In this lab we will load the temperature control loop from the Component Gallery, set up
supervisory messages to switch the control mode between Manual and Auto, and connect the
setpoint value outputs from the Sequence block to the temperature controller’s remote setpoint.
When the sequence is in IDLE and CHARGE modes the temperature controller is in Manual.
When the sequence reaches the HEAT step, the sequence block sends a Supervisory Message to the
controller to place it in Auto, and sends the remote setpoint value 90 to the temperature controller’s
Remote Setpoint Input. The controller remains in Auto with a setpoint of 90 through the COOK
step. When the sequence enters the COOL step it sends a new setpoint value of 20 to the
temperature controller, and when the COOL step is finished it places the controller back in Manual
mode.
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