Siemens S7-300 Configuration Manual page 238

Linking to other systems with FETCH/WRITE
3
4
5
6
7
8
9
A
B
C
D
I
F
Parameter values
S7 address area
ORG ID
DBNR
permitted range
Start address
permitted range
Length
permitted range
238
ID OP code
Length OP code
OP code
ORG field
Length ORG field
ORG ID
DBNR
Start address
Length
Empty field
Length empty field
DB
01
Source/dest.
data from/to
data block in
main memory
DB, from which
the source data
is taken or to
which the dest
data is
transferred
1...255
DW number
from which the
data is taken or
written to
0...2047
Length of the
source/dest.
data field in
words
Up to 8192
bytes
=0x01 3
=0x03 4
=0x05 5
=0x03 6
=0x08 7
8
9
High byte A
Low byte B
High byte C
Low byte D
=0xFF I
=0x02 F
M
02
H H
Source/dest.
data from/to bit
memory area
irrelevant
Memory byte
no., from which
the data is taken
or written to
All memory
bytes made
available by a
CPU.
Length of the
source/dest.
data field in
bytes
Up to 8192
bytes
Configuring and commissioning S7 CPs for Industrial Ethernet
Configuration Manual, 09/2013, C79000-G8976-C182-13
ID OP code
Length OP code
OP code
Ack field
Length ack field
Error field
Empty field
Length empty field
free
Data up to 64 K but only if
Error no. =0
I
03
H
Source/dest.
data from/to
process image
of the inputs
(PII)
irrelevant
Input byte no.
from which the
data is taken or
written to
0...127
Length of the
source/dest.
data field in
bytes
1...128
=0x01
=0x03
=0x06
=0x0F
=0x03
=No
=0xFF
=0x07
A
04
H
Source/dest.
data from/to
process image
of the outputs
(PIQ)
irrelevant
Output byte no.,
from which the
data is taken or
written to
0...127
Length of the
source/dest.
data field in
bytes
1...128