Statement List (STL) - DCE FEL ČVUT v Praze

Accumulator Instructions
14.4 POP CPU with Four ACCUs
Format
Description
Status word
Example
POP
POP (CPU with four ACCUs) copies the entire contents of ACCU 2 to ACCU 1, the
contents of ACCU 3 to ACCU 2, and the contents of ACCU 4 to ACCU 3. ACCU 4
remains unchanged. The instruction is executed without regard to, and without
affecting, the status bits.
BR CC 1 CC 0 OV OS OR STA RLO /FC
writes: - - - - - - - - -
STL Explanation
T MD10 //Transfer contents of ACCU 1 (= value A) to MD10
POP //Copy entire contents of ACCU 2 to ACCU 1
T MD14 //Transfer contents of ACCU 1 (= value B) to MD14
Contents ACCU 1 ACCU 2 ACCU 3 ACCU 4
before executing POP instruction value A value B value C value D
after executing POP instruction value B value C value D value D
Statement List (STL) for S7-300 and S7-400 Programming
14-4 A5E00706960-01