32.6.7.3 Explanation of the Power Bar Control (PBC) and Power
Bar Reset (PBR) Instructions
When a PBC instruction is executed, the program between PBC and
PBR will be executed.
PBC and PBR instructions can be used only in MAIN. They cannot
be used in other parts of the program.
When the PBC instruction is turned ON, the bit variable in D1
will turn ON. The program running between PBC and PBR instructions
executes ON processing until the PBC instruction turns OFF.
For every PBC instruction, one PBR instruction is always
required.
PBC/PBR instruction S1 specifies nesting level. The processing
of the specified level between PBC and PBR is executed.
Program example (without nesting)
When the variable of the normally open instruction is ON, the
PBC instruction will execute. When the PBC instruction is executed,
processing between PBC and PBR instructions is executed.
-
When the PBC instruction is OFF (PBC execution
bit is OFF)
The ADD instruction does not execute even when the normally open
instruction in the third rung is ON.
The MOV instruction does not execute even when the normally open
instruction in the fourth rung is ON.
-
When the PBC instruction is ON (PBC execution bit
is ON)
The ADD instruction is executed when the normally open instruction
in the third rung is ON.
The MOV instruction is executed when the normally open instruction
in the fourth rung turns ON.
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