Instruction list for S7-300 - DCE FEL ČVUT v Praze

Examples of Addressing Examples of Addressing
Examples of Addressing
Addressing Examples Description
Direct Addressing
L +27 Load 16-bit integer constant
“27” into ACCU1
L L#–1 Load 32-bit integer constant
“–1” into ACCU1
L 2#1010101010101010 Load binary constant into
ACCU1
L DW#16#A0F0_BCFD Load hexadecimal constant into
ACCU1
L ’END’ Load ASCII character into
ACCU1
L T#500 ms Load time value into ACCU1
L C#100 Load count value into ACCU1
L B#(100,12) Load 2-byte constant
L B#(100,12,50,8) Load 4-byte constant
L P#10.0 Load area-internal pointer into
ACCU1
L P#E20.6 Load area-crossing pointer into
ACCU1
L –2.5 Load real number into ACCU1
L D#1995–01–20 Load date
L TOD#13:20:33.125 Load time of day
Addressing Examples Description
Direct Addressing
A I 0.0 ANDing of input bit 0.0
L IB 1 Load input byte 1 into ACCU1
L IW 0 Load input word 0 into
ACCU1
L ID 0 Load input double word 0 into
ACCU1
Indirect Addressing of Timers/Counters
SP T [LW 8] Start timer; the timer number is
in local word 8
CU C [LW 10] Start counter; the counter number
is in local data word 10
Area-Internal Memory-Indirect Addressing
A I [LD 12]
Example: L P#22.2
T LD 12
A I [LD 12]
AND operation: The address of
the input is in local data double
word 12 as pointer
A I [DBD 1] AND operation: The address of
the input is in data double
word 1 of the DB as pointer
A Q [DID 12] AND operation: The address of
the output is in data double
word 12 of the instance DB as
pointer
A Q [MD 12] AND operation: The address of
the output is in memory marker
double word 12 of the instance
DB as pointer
S7-300 Instruction List S7-300 Instruction List
16 EWA 4NEB 710 6087-02 EWA 4NEB 710 6087-02
17