Initial steps and steps in FBD
Use an initial step and →steps in order to create a step sequence (an →SFC network).
Several steps are allowed per SFC network but only one initial step. See the notes under "SFC elements in drawing field" how to create/use SFC networks efficiently and correctly.
One or several →actions can be associated to each step (and each initial step as well). See "Evaluating the ST-code including the SFC networks" for information on when a step or initial step is active or inactive and the results of this.
Lines visualize the connections to the other FBD-elements in the drawing field.
Representation
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Example for initial step with name |
Example for step with name |
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The step input in is located on the top edge, the step output out on the bottom edge, the step marker output X on the right edge.
The step input and the step output are connected to →transitions, the step marker output is usually connected to an action block.
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Restrictions
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Depending on the configuration of your Neuron Power Engineer version, the FBD-editor and its elements might be displayed differently in your Neuron Power Engineer version than illustrated in the IDE documentation. This is the case, if Neuron or the system integrator has activated the smart styling or one of them has changed the styles for the FBD-editor. Subsequently, the illustration in the IDE documentation are symbolic images and the representation in your Neuron Power Engineer version takes precedence for the valid representation. In case of doubts, please contact Neuron or your system integrator.
Neuron recommends that you and/or your system integrator do not use yellow shades when designing FBD-elements because the color "Yellow" is used for tracking safe signals when developing safety-related applications. This recommendation applies in particular when you are using the legacy styling. Neuron Power Engineer does not check if colors are already used elsewhere. So the use of the yellow shades by you and/or your system integrator could have the consequence that "yellow" might also identify a non-safe logic as well.
Actions for initial step and steps
Connecting FBD-elements by lines
Copying and pasting variables/instances
Copying, cutting, pasting FBD-elements
Creating or editing initial steps or steps in FBD
Creating or editing OLT-fields in FBD
Creating step sequences in FBD
Deleting FBD-elements or already declared variables
Finding references for an in-/output
Inserting a call of a block or value field into existing lines