Smart Logic Control; Smart Logic Control Programming - Danfoss VLT HVAC Drive FC 102 Design Manual

Application Examples Design Guide

6.1.5 Smart Logic Control

In applications where a PLC is generating a simple
sequence the Smart Logic Controller (SLC) can take over
elementary tasks from the main control.
SLC is designed to act from event send to or generated in
the adjustable frequency drive. The adjustable frequency
drive then performs the pre-programmed action.

6.1.6 Smart Logic Control Programming

The Smart Logic Control (SLC) is essentially a sequence of
user-defined actions (see 13-52 SL Controller Action)
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executed by the SLC when the associated user-defined
event (see 13-51 SL Controller Event) is evaluated as TRUE
by the SLC.
Events and actions are each numbered and are linked in
pairs called states. This means that when event [1] is
fulfilled (attains the value TRUE), action [1] is executed.
After this, the conditions of event [2] is evaluated and if
evaluated TRUE, action [2] is executed and so on. Events
and actions are placed in array parameters.
It is possible to program from 0 to 20 events and actions.
When the last event/action has been executed, the
sequence starts over again from event [1]/action [1].
Figure 6.4 shows an example with three events/actions:
Figure 6.4 Example of Events and Actions
174 Danfoss A/S © Rev. 2014-01-13 All rights reserved. MG16C122