Siemens SIMATIC S5-100U, Системное руководство

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S5-100U STEP 5 Operations
Table 8-27. Overview of Load and Transfer Operations
Operation Meaning Operand
LIR Load the register indirectly
The contents of a memory word are loaded into the specified
register (ACCU 1, 2). The address is in ACCU 1.
TIR Transfer the register indirectly
The contents of the indicated register are transferred to a memory
location. The address is in ACCU 1.
Parameter
0 (for ACCU 1), 2 (for ACCU 2)
TNB Transfer a data field (byte-by-byte)
A memory area is transferred in the program memory as a field.
End address destination area:
ACCU 1
End address source area: ACCU 2
T Transfer
A word is transferred to the system data area.
Parameter
0 to 255
ID
RS
Loading and Transferring Register Contents
Both accumulators can be addressed as registers. Each register is 16 bits wide. Since the “LIR”
and “TIR” operations transmit data by words, the registers are addressed in pairs.
Loading and transferring register contents are independent of the RLO. The processor goes to
ACCU 1 to get the address of the memory location referenced during data exchange. Conse-
quently, make sure that the desired address is stored in ACCU 1 before this system operation is
processed.
Explanation STL
.
.
L KH 6100
LIR 0
Load the address 6100
H
into ACCU 1.
Load the information from the memory location with the address 6100
H
into
ACCU 1.
EWA 4NEB 812 6120-02b
8-65