Statement List (STL) - DCE FEL ČVUT v Praze

14.7 ENT Enter ACCU Stack
Format
Description
Example
ENT
Accumulator Instructions
ENT (enter accumulator stack) copies the contents of ACCU 3 into ACCU 4 and the
contents of ACCU 2 into ACCU 3. If you program the ENT instruction directly in front
of a load instruction, you can save an intermediate result in ACCU 3.
STL Explanation
L DBD0 //Load the value from data double word DBD0 into ACCU 1. (This value must be
in the floating point format).
L DBD4 //Copy the value from ACCU 1 into ACCU 2. Load the value from data double word
DBD4 into ACCU 1. (This value must be in the floating point format).
+R //Add the contents of ACCU 1 and ACCU 2 as floating point numbers (32 bit,
IEEE-FP) and save the result in ACCU 1.
L DBD8 //Copy the value from ACCU 1 into ACCU 2 load the value from data double word
DBD8 into ACCU 1.
ENT //Copy the contents of ACCU 3 into ACCU 4. Copy the contents of ACCU 2
(intermediate result) into ACCU 3.
L DBD12 //Load the value from data double word DBD12 into ACCU 1.
-R //Subtract the contents of ACCU 1 from the contents of ACCU 2 and store the result
in ACCU 1. Copy the contents of ACCU 3 into ACCU 2. Copy the contents of ACCU
4 into ACCU 3.
/R //Divide the contents of ACCU 2 (DBD0 + DBD4) by the contents of ACCU 1 (DBD8
- DBD12). Save the result in ACCU 1.
T DBD16 //Transfer the results (ACCU 1) to data double word DBD16.
14.8 LEAVE Leave ACCU Stack
Format
Description
LEAVE
LEAVE (leave accumulator stack) copies the contents of ACCU 3 into ACCU 2 and
the contents of ACCU 4 into ACCU 3. If you program the LEAVE instruction directly
in front of a shift or rotate instruction, and combine the accumulators, then the leave
instruction functions like an arithmetic instruction. The contents of ACCU 1 and
ACCU 4 remain unchanged.
Statement List (STL) for S7-300 and S7-400 Programming
A5E00706960-01 14-7