Siemens SIMATIC S7-200 System Manual page 456

S7-200 Programmable Controller System Manual
Tip
If you are working with a data unit (consistent data) of three bytes or data units greater than four
bytes, you must use SFC14 to read the inputs of the DP slave and SFC15 to address the
outputs of the DP slave. For more information, see the System Software for S7-300 and S7-400
System and Standard Functions Reference Manual.
Table A-42 lists the configurations that are supported by the EM 277 PROFIBUS--DP module. The
default configuration for the EM 277 module is two words of input and two words of output.
Table A-42 EM 277 Configuration Options
Configuration
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
You can configure the location of the input and output buffers to be anywhere in the V memory of
the S7-200 CPU. The default address for the input and output buffers is VB0. The location of the
input and output buffers is part of the parameter assignment information that the master writes to
the S7-200 CPU. You configure the master to recognize its slaves and to write the required
parameters and I/O configuration to each of its slaves.
Use the following tools to configure the DP master:
For SIMATIC S5 masters, use COM PROFIBUS Windows software
-
For SIMATIC S7 masters, use STEP 7 programming software
-
For SIMATIC 505 masters, use COM PROFIBUS and either TISOFT2 or SoftShop
-
For detailed information about using these configuration and programming software packages,
refer to the manuals for these devices. For detailed information about the PROFIBUS network and
its components, refer to the ET 200 Distributed I/O System Manual.
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Inputs to Master Outputs from Master
1 word
2 words
4 words
8 words
16 words
32 words
8 words
16 words
32 words
2 words
4 words
8 words
2 bytes
8 bytes
32 bytes
64 bytes
4 bytes
8 bytes
12 bytes
16 bytes
Data Consistency
1 word
2 words
4 words
8 words
16 words
32 words
Word Consistency Word Consistency
2 words
4 words
8 words
8 words
16 words
32 words
2 bytes
8 bytes
Byte Consistency Byte Consistency
32 bytes
64 bytes
4 bytes
8 bytes
Buffer Consistency Buffer Consistency
12 bytes
16 bytes