Siemens HB 131. 10 B Service Manual download pdf (Page 335)

ACCU contents before writing:

Result

•• If the data is written to the page correctly:

-

ACCU 1 and ACCU 3: remain unchanged.

-

ACCU-2-L: contains a value incremented by 1,

2 or 4 (depending on the length of

the data transferred)

-

RLO: = 1

-

the remaining bit and

word condition codes:

are cleared

•• If the data cannot be written to the page

-

all ACCUs: remain unchanged

-

RLO: = 0

-

all remaining bit and

word condition codes:

are cleared.

ACCU 4

ACCU 3

ACCU 2

ACCU 1

High byte Low byte Low byteHigh byte

High word Low word

xx xx

Length ID Page number

0 to 255

xx

Address (relative to start of page)

x

x

31 2324 16

data (8 bits)

data (16 bits)

data (32 bits)

x

x

0 ... 2046 if length ID 1 (word)

0 ... 2047 if length ID 0 (byte)

0 ... 2044 if length ID 2 (double word)

0: byte (8 bits)

1: word (16 bits)

2: double word (32 bits)

87 015

Fig. 6-13 ACCU contents before calling OB 216

6

OB 216 to OB 218: Page Access

CPU 928B Programming Guide

C79000-B8576-C898-01

6 - 83

1 2 ... 330 331 332 333 334 335 336 337 338 339 340 ... 612 613

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