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Siemens CPU 412-1 Instruction Manual Page 15

S7-400; cpu 412 series; cpu 414 series; cpu 416 series; cpu 417 series;.
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Address Registers AR1 and AR2 (32 Bits)
The address registers contain the area-internal or area-crossing pointers for instructions using indirect addressing. The address registers
are 32 bits long.
The area-internal and/or area-crossing pointers have the following syntax:
Area-internal pointer
Area-crossing pointer
Legend:
b
x
y
S7-400 Instruction List
A5E00267845-01
00000000 00000bbb bbbbbbbb bbbbbxxx
yyyyyyyy 00000bbb bbbbbbbb bbbbbxxx
Byte address
Bit number
Area identifier
(see "Examples of Addressing")
Registers
13

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