The Logic Controller (LC) is essentially a sequence of user defined actions (see par. LC-52 Logic Controller Action) executed by the LC when the associated user

defined event (see par. LC-51 Logic Controller Event) is evaluated as TRUE by the LC.

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] will be evaluated and if evaluated TRUE, action [2]will be executed and so on. Events and actions are placed in array parameters.

Only one event will be evaluated at any time. If an event is evaluated as FALSE, nothing happens (in the LC) during the present scan interval and no other events

will be evaluated. This means that when the LC starts, it evaluates event [1] (and only event [1]) each scan interval. Only when event [1] is evaluated TRUE, the LC

executes action [1] and starts evaluating event [2].

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]. The illustration shows an example with three events / actions:

5.1.7 LC Application Example

One sequence 1:

Start – accel – run at reference speed 2 sec – decel and hold shaft until stop.

Set the accel/decel times in par. F-07 Accel Time 1 and par. F-08 Decel Time 1 to the wanted times

t acc

n norm

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par