Siemens S7-300 Programmable Logic Controller Connection Guide

Below you will find brief information for Siemens S7-300. This document provides essential details for connecting Human Machine Interfaces (HMIs) to the Siemens S7-300 series PLC. It covers HMI settings, including recommended parameters like baud rate, data bits, parity, and PLC station number. The guide also details various device address formats for input, output, bit memory, and data registers, along with instructions on how to import tags from SIEMENS STEP 7 program files (*.dif and *.AWL). Comprehensive wiring diagrams for different HMI series and PC adapters are also included.

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PLC Connection Guide
Siemens S7-300
Supported Series: Siemens S7-300 series PLC
Website: http://www.siemens.com/entry/cc/en/
HMI Setting:
Parameters
Recommended Options
PLC type
SIEMENS S7-300
PLC I/F
RS232
Notes
Must be same as the PLC setting.
Baud rate
19200
9600~187.5K
The HMI which has a sticker MPI187.5
on the rear cover supports 187.5K.
Data bits
8
Parity
Odd
Stop bits
1
PLC sta. no.
2
Must be same as the PLC setting.
Device Address:
Bit/Word Device type
Format
Range
Memo
B
I
DDDDo
0 ~ 40957
Input (I)
B
Q
DDDDo
0 ~ 40957
Output (O)
B
M
DDDDo
0 ~ 40957
Bit Memory
B
DBnBit
FFFFDDDDo
0 ~ 409681927
Data Register Bit
B
DB1Bit ~
DB99Bit
DDDDo
0 ~ 81927
W
IW
DDDD
0 ~ 4095
Input (I)
W
QW
DDDD
0 ~ 4095
Output (O)
W
MW
DDDD
0 ~ 4095
Bit Memory
DW
MD
DDDD
0 ~ 4094
Byte
MB
DDDD
0 ~ 4095
Bit Memory Byte
Byte
DBBn
FFFFDDDD
0 ~ 40968192
Data Register Byte
W
DBn
FFFFDDDD
0 ~ 40968192
Data Register (must be even)
DW
DBDn
FFFFDDDD
0 ~ 40968192
W
DBn_String
FFFFDDDD
0 ~ 40968192
Data Register Double Word
(must be multiple of 4)
Data Register Double Word
PLC Connection Guide
Bit/Word Device type
Format
Range
Memo
(must be multiple of 4)
DW
DBDn_String FFFFDDDD
0 ~ 40968192
W
DB1-DB99
0 ~ 8192
DDDD
Data Register Double Word
(must be multiple of 4)
Data Register
(must be even)
* Double word and floating point value must use DBDn device type.
How to Import Tag:
SIEMENS STEP 7 program allows building files of user-defined tag (*.dif file and *.AWL
file), and import these files in EasyBuilder8000/EasyBuilderPro -&gt; System Parameter
Settings. The following describes how to build and import these two types of files.
1. Building *.dif File
a、 In “Symbols” create user-defined tag.
PLC Connection Guide
b、 Click Export to export the edited file and click Save.
2. Building *.AWF File
a、 In Blocks create items as shown below:
b、 Open LAD/STL, FBD – Programming S7 Blocks, click File -&gt; Generate
Source.
PLC Connection Guide
c、 Select Sources as storage path, specify the file name then click OK.
d、 Select the objects to be exported then click OK.
PLC Connection Guide
e、 Under Sources there will be names of the saved files, select Export Source
to build *.AWL file.
The generated *.dif and *.AWL files can be imported in EasyBuilder8000/EasyBuilderPro
System Parameter Settings, by clicking Import Tag.
Tag information successfully imported.
PLC Connection Guide
Wiring Diagram:
The following is the view from the soldering point of a cable.
Siemens S7-300 PC Adapter : 9P D-Sub to 9P D-Sub:
eMT3000 series
COM1 RS232 9P
D-Sub Female
COM3 RS232 9P
D-Sub Female
RS232 9P D-Sub Male
2 RX
8 RX
3 TXD
3 TX
7 TX
2 RXD
5 GND
5 GND
5 GND
7 RTS
8 CTS
short
cMT/mTV series
COM1 RS232 9P
D-Sub Female
RS232 9P D-Sub Male
2 RX
3 TXD
3 TX
2 RXD
5 GND
5 GND
7 RTS
8 CTS
short
MT8000iE/MT8000XE series except MT8050iE
COM1 RS232 9P
D-Sub Female
RS232 9P D-Sub Male
2 RX
3 TXD
3 TX
2 RXD
5 GND
5 GND
7 RTS
8 CTS
short
MT6000/8000 series except MT6050i/MT8050i
COM1 RS232 9P
D-Sub Female
COM2 RS232 9P
D-Sub Female
COM3 RS232 9P
D-Sub Male
RS232 9P D-Sub Male
2 RX
6 RX
8 RX
3 TXD
3 TX
4 TX
7 TX
2 RXD
5 GND
5 GND
5 GND
5 GND
7 RTS
8 CTS
short
PLC Connection Guide
MT6050i/MT8050i/MT8050iE
COM1 RS232 9P
D-Sub Female
RS232 9P D-Sub Male
9 RX
3 TXD
6 TX
2 RXD
5 GND
5 GND
7 RTS
8 CTS
short
The following is the view from the soldering point of a cable.
Systeme Helmholz SSW7-TS : 9P D-Sub to 9P D-Sub
eMT3000 series
COM1 RS232 9P
D-Sub Female
COM3 RS232 9P
D-Sub Female
RS232 9P D-Sub Male
2 RX
8 RX
3 TXD
3 TX
7 TX
2 RXD
5 GND
5 GND
5 GND
7 RTS
8 CTS
4 DTR
6 DSR
short
short
cMT/mTV series
COM1 RS232 9P
D-Sub Female
RS232 9P D-Sub Male
2 RX
3 TXD
3 TX
2 RXD
5 GND
5 GND
7 RTS
8 CTS
4 DTR
6 DSR
short
short
PLC Connection Guide
MT8000iE/MT8000XE series except MT8050iE
COM1 RS232 9P
D-Sub Female
RS232 9P D-Sub Male
2 RX
3 TXD
3 TX
2 RXD
5 GND
5 GND
7 RTS
8 CTS
4 DTR
6 DSR
short
short
MT6000/8000 series except MT6050i/MT8050i
COM1 RS232 9P
D-Sub Female
COM2 RS232 9P
D-Sub Female
COM3 RS232 9P
D-Sub Male
RS232 9P D-Sub Male
2 RX
6 RX
8 RX
3 TXD
3 TX
4 TX
7 TX
2 RXD
5 GND
5 GND
5 GND
5 GND
7 RTS
8 CTS
4 DTR
6 DSR
short
short
MT6050i/MT8050i/MT8050iE
COM1 RS232 9P
D-Sub Female
RS232 9P D-Sub Male
9 RX
3 TXD
6 TX
2 RXD
5 GND
5 GND
7 RTS
8 CTS
4 DTR
6 DSR
Driver Version:
Version
Date
Description
V3.10
May/24/2011
Added registers: MB &amp; DBBn.
short
short
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Key features

Detailed HMI settings for Siemens S7-300 PLC connection
Supports RS232 interface with configurable baud rates (9600-187.5K)
Comprehensive device address formats for Bit/Word devices (I, Q, M, DBnBit, IW, QW, MW, MD, MB, DBBn, DBn, DBDn, DBn_String, DB1-DB99)
Tag import capability from SIEMENS STEP 7 program (*.dif and *.AWL files)
Includes precise wiring diagrams for various Weintek HMI series (eMT3000, cMT/mTV, MT8000iE/XE, MT6000/8000) with Siemens PC Adapters and Systeme Helmholz SSW7-TS
Supports Double Word and Floating Point values using DBDn device type

Frequently asked questions

The recommended HMI settings include PLC type SIEMENS S7-300, PLC I/F RS232, Baud rate 19200 (options 9600~187.5K), Data bits 8, Parity Odd, Stop bits 1, and PLC station number 2. The Baud rate must match the PLC setting, and HMIs with an MPI187.5 sticker support 187.5K.

Tags can be imported by building *.dif files (exporting user-defined tags from 'Symbols') or *.AWL files (generating source from 'Blocks' in LAD/STL, FBD – Programming S7 Blocks). These files can then be imported via the 'Import Tag' function in EasyBuilder8000/EasyBuilderPro System Parameter Settings.

The guide supports Bit/Word device types including Input (I), Output (Q), Bit Memory (M, MB), Data Register Bit (DBnBit, DB1Bit~DB99Bit), Data Register Byte (DBBn), Data Register (DBn, must be even), Data Register Double Word (DBDn, DBn_String, DBDn_String, must be multiple of 4), and Data Register (DB1-DB99, must be even).