Siemens S7-300 - Page 238

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