STEP 5 Operations
S5-100U
Load Operation
During loading, information is copied from a memory area, e.g., from the PII, into ACCU 1.
The previous contents of ACCU 1 are shifted to ACCU 2.
The original contents of ACCU 2 are lost.
Example:
Two consecutive bytes (IB7 and IB8) are loaded from the PII into the accumulator.
Loading does not change the PII (see Figure 8-2).
Figure 8-2. Execution of the Load Operation
Byte a
Byte c
L IB8
L IB7
Information
from the PII
Lost
information
0
IB7
ACCU 2
ACCU 1
Byte b
Byte d
IB7
Byte d
Byte c
Byte a
Byte b
IB7
0
Byte b
Byte a
0
IB8
IB
Transfer Operation
During transfer, information from ACCU 1 is copied into the addressed memory area, e.g., into the
PIQ.
This transfer does not affect the contents of ACCU 1.
Example:
Figure 8-3 shows how byte a, the low byte in ACCU 1, is transferred to QB5.
Figure 8-3. Transferring a Byte
T QB5
Information
in the PIQ
Lost
information
ACCU 2
ACCU 1
Byte d
Byte c
Byte a
Byte d
Byte b
Byte c
Byte a
Byte a
Byte b
Previous value
of QB5
8-12
EWA 4NEB 812 6120-02b
Содержание SIMATIC S5-100U
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Страница 505: ...B Dimension Drawings EWA 4NEB 812 6120 02b ...
Страница 515: ...C Active and Passive Faults in Automation Equipment EWA 4NEB 812 6120 02b ...
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Страница 523: ...D Information for Ordering Accessories EWA 4NEB 812 6120 02b ...
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Страница 531: ...E Reference Materials EWA 4NEB 812 6120 02b ...
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Страница 535: ...F Siemens Addresses Worldwide EWA 4NEB 812 6120 02b ...
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Страница 543: ...Index EWA 4NEB 812 6120 02b ...
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