Statement List (STL) - DCE FEL ČVUT v Praze

Logic Control Instructions
6.3 JL Jump to Labels
Format
Description
Status word
Example
JL
Address Description
Symbolic name of jump destination.
JL (jump via jump to list) enables multiple jumps to be programmed.
The jump target list, with a maximum of 255 entries, begins on the next line after the
JL instruction and ends on the line before the jump label referenced in the JL
address. Each jump destination consists of one JU instruction. The number of jump
destinations (0 to 255) is taken from ACCU 1-L-L.
The JL instruction jumps to one of the JU instructions as long as the contents of the
ACCU is smaller than the number of jump destinations between the JL instruction
and the jump label. The first JU instruction is jumped to if ACCU 1-L-L=0. The
second JU instruction is jumped to if ACCU 1-L-L=1, etc. The JL instruction jumps to
the first instruction after the last JU instruction in the destination list if the number of
jump destinations is too large.
The jump destination list must consist of JU instructions which precede the jump
label referenced in the address of the JL instruction. Any other instruction within the
jump list is illegal.
BR CC 1 CC 0 OV OS OR STA RLO /FC
writes: - - - - - - - - -
STL Explanation
L MB0 //Load jump destination number into ACCU 1-L-L.
JL LSTX //Jump destination if ACCU 1-L-L > 3.
JU SEG0 //Jump destination if ACCU 1-L-L = 0.
JU SEG1 //Jump destination if ACCU 1-L-L = 1.
JU COMM //Jump destination if ACCU 1-L-L = 2.
JU SEG3 //Jump destination if ACCU 1-L-L = 3.
LSTX: JU COMM
SEG0: * //Permitted instruction
*
JU COMM
SEG1: * //Permitted instruction
*
JU COMM
SEG3: * //Permitted instruction.
*
JU COMM
COMM: *
*
Statement List (STL) for S7-300 and S7-400 Programming
6-4 A5E00706960-01