In order to configure in which way the actions should be associated to the IEC steps, some qualifiers are available, which are to be inserted in the qualifier field of an action element.
|
Qualifier |
Long Form |
Description |
|---|---|---|
|
N |
non-stored |
The action is active as long as the step is active. |
|
R0 |
overriding reset |
The action becomes deactivated. |
|
S0 |
set (stored) |
The action will be started when the step becomes active and will be continued after the step is deactivated until the action is reset. |
|
L |
time limited |
The action will be started when the step becomes active. It will continue until the step becomes inactive or a set time has passed. |
|
D |
time delayed |
A delay timer will be started when the step becomes active. If the step is still active after the time delay, the action will start and continue until it is deactivated. NOTE: When two consecutive steps have a D (time delayed) action for setting the same boolean variable, this variable will not be reset during the transition from one step to the other. In order to reset the variable, insert an intermediate step between the two steps. |
|
P |
pulse |
The action will be started when the step becomes active/deactive and will be executed once. |
|
SD |
stored and time delayed |
The action will be started after the set time delay and it will continue until it is reset. |
|
DS |
delayed and stored |
If the step is still active after the specified time delay, the action will start and it will continue until it is reset. |
|
SL |
stored and time limited |
The action will be started when the step becomes active and it will continue for the specified time or until a reset. |
The qualifiers L, D, SD, DS, and SL need a time value in the TIME constant format. Enter it directly after the qualifier, separated by a blank space, for example L T#10s.
NOTE: When an IEC action has been deactivated, it will be executed one more time. The implication is that each action will execute at least twice.
