Eaton Power Xpert C445 User Manual page 179

Flow Control Group
First Scan
The First Scan function block serves as a flag to indicate the first scan of the logic program.
OUT is set to TRUE and remains true until the first scan of the program completes
execution. This occurs when the logic program is started or restarted by enabling the logic
run control or downloading a program or by power cycling the system that already has a
loaded logic program. The first scan can be used as a flag for example, to initialize any
variables once before executing the main program. This is often used in conjunction with
the JMP function block. See the Flow Control example below.
JMP and LBL
The JMP transfers the execution flow of the program to its paired label—LBL when the
input condition of the JMP is TRUE. To Add a JMP LBL pair, add the JMP function block to
the canvas and then click anywhere in the canvas to add the paired LBL. A JMP and an
LBL are paired by using same names for the JMP and the LBL. In the example shown
above, LBL_1 is the pairing name for the JMP and the LBL.
Parameter Data type
JMP Condition BOOL
Description
When TRUE, JMP is executed.
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Chapter 9—C445 Logic Engine and Expansion I/O
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