Statement List (STL) - DCE FEL ČVUT v Praze

6.2 JU Jump Unconditional
Format
Description
Status word
Example
JU
Address Description
Symbolic name of jump destination.
Logic Control Instructions
JU interrupts the linear program scan and jumps to a jump
destination, regardless of the status word contents. The linear program scan
resumes at the jump destination. The jump destination is specified by a jump label.
Both forward and backward jumps are possible. Jumps may be executed only within
a block, that is, the jump instruction and the jump destination must lie within one and
the same block. The jump destination must be unique within this block. The
maximum jump distance is -32768 or +32767 words of program code. The actual
maximum number of statements you can jump over depends on the mix of the
statements used in your program (one-, two-, or three word statements).
BR CC 1 CC 0 OV OS OR STA RLO /FC
writes: - - - - - - - - -
STL Explanation
A I 1.0
A I 1.2
JC DELE //Jump if RLO=1 to jump label DELE.
L MB10
INC 1
T MB10
JU FORW //Jump unconditionally to jump label FORW.
DELE: L 0
T MB10
FORW: A I 2.1 //Program scan resumes here after jump to jump label FORW.
Statement List (STL) for S7-300 and S7-400 Programming
A5E00706960-01 6-3