6-14
Primer: S7-300 Programmable Controller, Quick Start
C79000-G7076-C500-01
You have created OB1 and FC1 as blocks and you have assigned the
incremental FBD editor as the language editor.
If you double-click on the FC1 which has already been programmed in the
SIMATIC Manager, the assigned FBD editor is started and you can program
the block.
An FBD network can consist of several elements in several branches. All
elements and branches of such a network must be linked together.
There are some rules to observe when programming in FBD:
S Each FBD network must end with either an assignment or a box.
S The following FBD elements cannot be used to end a network: compare
boxes (-=-), midline outputs (-#-), and positive (-P-) or negative (-N-)
edge evaluation.
S You can attach standard boxes (flip-flops, counters, math instructions,
etc.) to boxes with binary logic.
S You cannot program unlinked logic operations with separate outputs in a
network.
Don’t worry.
If you make any errors in entering
the FBD statements, error messages
will bring them to your attention!
Prerequisite
Starting the FBD
Language Editor
Rules for Entering
FBD Elements
Programming Logic Blocks with STEP 7
How Do You Program Blocks in FBD?
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