Examples of Addressing
16
S7-400 Instruction List
A5E00267845-01
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 data word 8
CU C [LW 10] Count upwards; 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 open DB as pointer
A I [DID 12] AND operation: The address of the output is in data double word 12 of the open instance DB as pointer
A I [MD 12] AND operation: The address of the output is in memory double word 12 as pointer
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