Smart Logic Controller - Danfoss VLT AutomationDrive FC 300 Design Manual

FC 300 Design Guide
Introduction to FC 300

Smart Logic Controller

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The Smart Logic Controller (SLC) is essentially a sequence of user-defined actions (see par. 13-52) executed
by the SLC when the associated user-defined event (see par. 13-51) is evaluated as TRUE by the SLC.
Events and actions are each numbered and are linked together in pairs. This means that when event
[0] is fulfilled (attains the value TRUE), action [0] is executed. After this, the conditions of event [1]
will be evaluated and if found to be TRUE, action [1] will be executed and so on.
Only one event will be evaluated at any time. If an event is evaluated as FALSE, nothing happens
(in the SLC) during the present scan interval and no other events will be evaluated. This means that
when the SLC starts, it evaluates event [0] (and only event [0]) each scan interval. Only when event
[0] is evaluated TRUE, the SLC executes action [0] and starts evaluating event [1].
It is possible to program from 1 to 6 events and
actions. When the last event / action has been
executed, the sequence starts over again from
event [0] / action [0]. The illustration shows an
example with three events / actions:
Starting and stopping the SLC:
Starting and stopping the SLC can be done by selecting "On [1]" or "Off [0]" in par. 13-50. The SLC always
starts in state 0 (where it evaluates event [0]). If the drive is stopped or coasted by any means (either via
digital input, field bus or other), the SLC automatically stops. If the drive is started by any means (either via
digital input, field bus or other), the SLC also starts (provided that "On [1]" is selected in par. 13-50).
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