Siemens PVN 875 Series Specifications

Simatic Tip
SIMATIC
TIPS
Totally Integrated Automation
Application Notes
Group
PLC
Scalance
Topic and Author
Configuration of M875 with IPsec VPN Tunnel
Bernd Krueger
Overview
This document covers how to configure the M875 for connection to a PLC using a VPN
Tunnel using the Siemens SoftNet Client Software. It is assumed that the user is already
proficient in the use of Siemens PLCs, Step 7 V5.5 and/or the TIA Portal software.
As a cautionary note: Siemens takes no responsibility for any data overage or roaming
charges for any services used with the M875 device. Always review your data plan before
configuring and using this device so that you are aware of proper configuration for you usage
plan.
STEP by STEP
Step 1 thru 26 – M875 Configuration
Step 27– PLC Configuration
Step 28 thru 75 – VPN Configuration
Resetting the M875 to Factory Defaults
To reset the M875, press the Reset button on the front of the unit with a paperclip. This
will take a few minutes and the lights on the device will begin to flash. All configuration data,
user data, certificates and log files are deleted.
Step 1 – Acquire AT&T data plan
If you have an existing Corporate AT&T account contact your designated person. If you do not
already have a corporate AT&T account please contact your local Siemens person. As of the
writing of this Application Note that person is: Ming Ng, email is daming.ng@siemens.com and
he can put you in contact the correct AT&T representative. Sim cards can be ordered with or
without Static IP addresses. Before you commit to a plan always check your coverage, for ATT
you can go to www.att.com/coverage. You can also get coverage apps for your mobile phone
for example www.mymobilecoverage.com. One more note ATT Wireless Hotspots will not work
with the M875 due to their policy of blocking mobile to mobile communication.
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SIMATIC customers have free use of the application tips. These tips are only a general approach to using SIMATIC with various applications. Your
specific application may be different. It is your responsibility to use SIMATIC properly in your applications.
Step 2 – Enterr PIN num
mber if re
equired – not norrmal in USA
In the USA it is norm
mally not re
equired to en
nter a PIN n
number for a sim card, but if requirred follow
steps 4 thru 6 below
w. DO NOT
T PUT THE SIM CARD IN THE M8
875 IF YOU REQUIRE A PIN.
Then go
o to “Externa
al Network” “UMTS/EDGE”, enter tthe PIN num
mber and sa
ave. After ssaving
Power O
Off the M875
5 and contin
nue to Step 3.
Step 3 – Insertt SIM carrd





B
Before you insert
i
or rem
move the SIIM card, turn
n off the pow
wer supply of the M875
5.
Do not open
D
n the compa
artment for tthe SIM card
d during ope
eration. This can dama
age the
S card an
SIM
nd the device.
T
The comparrtment for th
he SIM card
d is located on
o the backk of the device.
T
To open the
e drawer, pre
ess the yellow button w
with a sharp
p object, for example a pencil.
P
Place the SIM card in th
he tray so th
hat the card
d audibly loccks in place and so thatt its
g
goldplated ccontacts rem
main visible..
T
Then push tthe tray with
h the SIM ca
ard complettely back intto the housing
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4
SIMATIC customers
c
have frree use of the application tips. These
e tips are only a ge
eneral approach to
o using SIMATIC w
with various appliccations. Your
specific application may be diff
fferent. It is your re
esponsibility to use
e SIMATIC properrly in your applications.
Step 4 – Configuration PC
The configuration PC must be connected either directly to the first Ethernet port of the M875 or
have access to the M875 via the local network. The network adapter of the configuration PC
must have the following TCP/IP configuration:
 IP address: 192.168.1.x – x being any number other than 1.
 Subnet mask: 255.255.255.0
Step 5 – Connect using “Internet Explorer” or “Mozilla Firefox”
Enter the M875’s IP address – the default is: https://192.168.1.1
In “Internet Explorer select the “Red X” Continue to this website.
For Mozilla Firefox:
Select “Add Exceptions”
Either uncheck or leave checked “Permanently store this exception” and then press “Confirm
Security Exception”.
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SIMATIC customers have free use of the application tips. These tips are only a general approach to using SIMATIC with various applications. Your
specific application may be different. It is your responsibility to use SIMATIC properly in your applications.
Step 6 – Enter Login data
Internet Explorer login screen – enter “admin” and “scalance” for first time login.
Mozilla Firefox login screen – enter “admin” and “scalance” for first time login.
Step 7 – Overview Screen at startup
After logging into the system the “Overview” screen is shown.
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SIMATIC customers have free use of the application tips. These tips are only a general approach to using SIMATIC with various applications. Your
specific application may be different. It is your responsibility to use SIMATIC properly in your applications.
Step 8 – Change Default Password
For security reasons it is highly recommended to immediately change from the Default
password. To do this go to the “Remote access” “Password” tab on the left hand side of the
screen. For a secure password do not use something that is in the dictionary, at lease 8
characters long and include “Upper case, lower case, numbers, and special characters”. The
following special characters are allowed:
! $ % & ' ( ) * + , . / : ; < = > ? @ [ \ ] ^ _ ` { | }
After entering the new password press “Save”, you will then be requested to log back into the
M875.
Step 9 – View default IP address
Go to the “Local IP addresses” as shown in the picture.
Step 10 – Change default IP address
For our project we need to use a 192.168.10.x IP address range. Change the address of the
M875 to 192.168.10.1 and 255.255.255.0 and then press “Save”. Change the IP address of
your computer to something in 192.168.10.x range (192.168.10.99 for example). In “Internet
Explorer” or “Mozilla Firefox” change the site to connect to https://192.168.10.1 and log back in
using your new password.
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SIMATIC customers have free use of the application tips. These tips are only a general approach to using SIMATIC with various applications. Your
specific application may be different. It is your responsibility to use SIMATIC properly in your applications.
Step 11 – Overview Screen
With the SIM card inserted you will see a screen similar to this.
Step 12 – Set the system time
Enter the correct date and time and Local timezone. An NTP server can be selected to
automatically synchronize the date and time. Keep in mind that using the NTP synchronization
will use data from your data plan. Press the “Save” button when finished.
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SIMATIC customers have free use of the application tips. These tips are only a general approach to using SIMATIC with various applications. Your
specific application may be different. It is your responsibility to use SIMATIC properly in your applications.
Step 13 – Overview of the External Network settings
Shown are the default “External Network – UMTS/EDGE” settings.
Step 14 – Configure the External Network settings
For our application enable “Allow roaming” and delete all the “List of moble wireless providers”
and press “Save”. Make sure to check with your provider if you are charged extra for roaming.
Only enable roaming if required for your application – 2G Partner connection.
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SIMATIC customers have free use of the application tips. These tips are only a general approach to using SIMATIC with various applications. Your
specific application may be different. It is your responsibility to use SIMATIC properly in your applications.
Step 15 – Change Provider Mode to Manual
Step 16 – Enter APN data for Manual mode
Enter the correct APN data for your data plan and press “Save”. If using the Siemens Demo SIM
enter:



Username – guest
Password – guest
APN – i2gold or ccspbsc197.acfes.org – depends on the demo case
Note: If you are using a Partner 2G signal you will need to use “UMTS or GSM” and “Allow
Roaming” for your system to function properly.
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SIMATIC customers have free use of the application tips. These tips are only a general approach to using SIMATIC with various applications. Your
specific application may be different. It is your responsibility to use SIMATIC properly in your applications.
Step 17 – Enable Installation mode
Installation mode is used for antennae alignment.
Select the time for Installation mode – 15 minutes should be adequate and press “Save”. Be
sure to turn this back off when you are finished or you will not be able to finish connecting to your
device.
Step 18 – Installation Mode enabled
Adjust antennae until the best signal is received. Either let the time out occur for Insatllation
mode or change back to “No” and select “Save”.
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SIMATIC customers have free use of the application tips. These tips are only a general approach to using SIMATIC with various applications. Your
specific application may be different. It is your responsibility to use SIMATIC properly in your applications.
Step 19 – Overview page after allignment
After alignment, it may take a few minutes, but additional information should now be displayed in
the Overview screen.




Connected Since
Assigned IP address – instead of 192.168.44.44 it would show the actual IP address of
the SIM card or the dynamic IP address
APN in use
ID of the current wireless cell
Step 20 – Security settings for ping
To test the connection go to the “Security” “Advanced settings” and set the “External ICMP” to
“Allow ping” and press “Save”. You should now be able to ping the IP address from the overview
page from a computer connected to the internet.
Note
Increased costs due to extra data traffic
By sending the ping packets, the data traffic on the UMTS/GPRS connection is increased.
This may result in additional costs, depending on your user agreement with the mobile wireless
provider.
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SIMATIC customers have free use of the application tips. These tips are only a general approach to using SIMATIC with various applications. Your
specific application may be different. It is your responsibility to use SIMATIC properly in your applications.
Step 2
21 – Ping
g the M87
75 from tthe Intern
net
Disconn
nect your PC
C from the M
M875 or use
e a different computer tthat has a co
onnection to
o the
internet.. Ping the IP
P address sshown in the
e Overview page.
You can
n decide to leave Ping e
enabled on the M875 or
o for a more
e secure sysstem “Disca
ard” Ping.
Make su
ure you plug
g the M875 back into yo
our compute
er when finished. Keep
p in mind that leaving
Ping ena
abled will usse data from
m your data plan.
Step 2
22 – Dyna
amic IP address
a
The Siem
mens Demo
o SIM has a fixed IP ad
ddress, if yo
ou have a fixxed IP addre
ess skip to sstep 25.
If you ge
et a Dynamiic IP addresss from you provider yo
ou will need to also use
e a Dynamicc DNS
Server. You need tto go to WW
WW.dyndns..org and cre
eate a profile
e.
Select “R
Remote Acccess”.
Purchasse the DynD
DNS Pro and
d register a DNS name
e for your M8
875 connecction. The DNS name
must use “dyndns.o
org” as the e
extension fo
or example ““brkm875.dyndns.org”. The IP address
used mu
ust also refle
ect the Dynamic IP add
dress that w
was shown o
on the M875
5 “System O
Overview”
screen – do not use
e the IP add
dress shown
n in this dem
mo.
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34
SIMATIC customers
c
have frree use of the application tips. These
e tips are only a ge
eneral approach to
o using SIMATIC w
with various appliccations. Your
specific application may be diff
fferent. It is your re
esponsibility to use
e SIMATIC properrly in your applications.
Step 2
23 – Ente
er the dyn
ndns serrver hostt name
Enter yo
our DynDNS
S server hosst name for a dynamic IP address example :
m875de
emo.dyndns.org. Presss “Save”. Yo
ou can now
w ping your d
device using
g the Host name.
n
Make su
ure you set Ping “Accep
pt” if you ha
ad turned it o
off in step 21
2 or you willl get no ressponse to
your ping request.
The Sysstem Overview screen will
w reflect th
he “Externa
al host name
e” as “m875
5demo.dynd
dns.org”.
This may take a few
w minutes to
o show.
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34
SIMATIC customers
c
have frree use of the application tips. These
e tips are only a ge
eneral approach to
o using SIMATIC w
with various appliccations. Your
specific application may be diff
fferent. It is your re
esponsibility to use
e SIMATIC properrly in your applications.
Step 24 – Configure Remote access
Select “Yes” to enable HTTPS remote access, change the Port to 4443 in case you want to use
Port 443 to allow restricted logon access to the PLC. You will also need to add a firewall rule to
allow a connection “From IP address”. This IP address can be a specific address or if you leave
it as “0.0.0.0/0” then anyone can try and access it. This is why a secure password is critical. I
would suggest that you enter the IP address that is assigned to your location to keep others from
gaining access or do not enable remote access. To test the connection the computer must have
internet access, using Internet Explorer or Mozilla Firefox, enter for example
https://192.168.44.44:4443 or https://m875demo.dyndns.org:4443 and you should get to the
login screen.
Step 25 – Configure Firewall Rules
By default the Firewall is configured to block everything.
The firewall is configured to accept only TCP data incomming to our PLC (192.168.10.2) on Port
80 (Webserver) and Port 102 (Simatic Data).
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SIMATIC customers have free use of the application tips. These tips are only a general approach to using SIMATIC with various applications. Your
specific application may be different. It is your responsibility to use SIMATIC properly in your applications.
Step 26 – Volume Monitoring
You can configure a text message to be sent warning of reaching a “maximum data
usage per month”. This is only a message and will NOT stop the M875 from sending or
receiving data. Your Data Plan Will Continue to Get Billed and you WILL be charged by
the carrier for any data plan overage costs.
Step 27 – PLC Hardware Configuration
Step 7 V5.5
TIA Portal V11
Make sure the PLC configuration sets the IP address to an IP address in the range of
192.168.10.x and use router 192.168.10.1, then “Save and Comple”. Unplug your pc from the
M875, plug the PC into the PLC and download the hardware configuration. Then disconnect the
PC from the network and plug the PLC into the top Ethernet Port of the M875.
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SIMATIC customers have free use of the application tips. These tips are only a general approach to using SIMATIC with various applications. Your
specific application may be different. It is your responsibility to use SIMATIC properly in your applications.
Step 28 – Create IPsec VPN Certificates - Security Configuration Tool
From the Windows “Start Menu” start the “Security Configuration Tool”
Step 29 – Start new project
Select “Project” “New”
Step 30 – Create project User name and password
Enter a User name and password for the project.
For this demo User name: admin and Password: siemens1 – all lower case. For a real project
you should not use “admin” as the user and make a secure password using upper case, lower
case, numbers, and special characters – see step 8 for example. The password must be at least
8 characters.
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SIMATIC customers have free use of the application tips. These tips are only a general approach to using SIMATIC with various applications. Your
specific application may be different. It is your responsibility to use SIMATIC properly in your applications.
Step 31 – Configure the M875 IP address
Enter the following:






Product type – SOFTNET Configuration
Module – SCALANCE M87x/MD74x
Name of the module – m875demo
IP address (ext) – your AT&T SIM card IP address. If a Dynamic address was assigned
just enter any address or use the address from the overview screen in step 19 which is
the dynamic address that is temporarily assigned. For our demo 192.168.44.44 subnet
255.255.255.0– not a real address.
IPaddress (int) - 192.168.10.1 subnet 255.255.255.0 – this is the nework that the PLC will
be connected.
Press “OK”
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SIMATIC customers have free use of the application tips. These tips are only a general approach to using SIMATIC with various applications. Your
specific application may be different. It is your responsibility to use SIMATIC properly in your applications.
Step 32 – Insert Module
Insert next Module.
Step 33 – Configure Softnet Security Client Module
Enter the following:





Product type – SOFTNET Configuration
Module – SOFTNET Security Client
Firmware release – V3
Name of the module - computer
Press “OK”
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SIMATIC customers have free use of the application tips. These tips are only a general approach to using SIMATIC with various applications. Your
specific application may be different. It is your responsibility to use SIMATIC properly in your applications.
Step 34 – Insert VPN Group
Insert a new “VPN group”
Step 35 – Move into VPN Group
Highlight “m875demo” and “computer” then drag and drop into the VPN “Group 1”
Step 36 – Certificate changes to blue
After the modules are put into the VPN “Group1” the keys turn blue to show the VPN tunnel.
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SIMATIC customers have free use of the application tips. These tips are only a general approach to using SIMATIC with various applications. Your
specific application may be different. It is your responsibility to use SIMATIC properly in your applications.
Step 37 – Advanced View
Change to “View” “Advanced mode”
Select “Yes”
Step 38 – IPsec VPN Properties
Right mouse click on “Group1” and select “Properties”
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SIMATIC customers have free use of the application tips. These tips are only a general approach to using SIMATIC with various applications. Your
specific application may be different. It is your responsibility to use SIMATIC properly in your applications.
Step 39 – Modifiy IPsec VPN Properties
Make sure “SA lifetime” for both “phase 1” and “phase 2” is set to 1440 or the connection will not
work. Press “OK” and then save the project.
Step 40 – Transfer Certificates to files
Highlight both the “m875demo” and “computer” certificates and then right mouse click and
“Transfer to module(s)”. You do not need to be online with the M875, this is used only to create
the certificate files.
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SIMATIC customers have free use of the application tips. These tips are only a general approach to using SIMATIC with various applications. Your
specific application may be different. It is your responsibility to use SIMATIC properly in your applications.
Step 41 – Select Ethernet Adapter
Select the Ethernet adapter that you will use to download SCT configurations. This can always
be changed later. This screen may not appear if you have already used the software.
Step 42 – Start Certificate Transfer
Press “Start” to create the certificate files – you will be asked where to store the files.
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SIMATIC customers have free use of the application tips. These tips are only a general approach to using SIMATIC with various applications. Your
specific application may be different. It is your responsibility to use SIMATIC properly in your applications.
Step 43 – Set password
Answer “Yes”
For the demo – “siemens1” is used.
Select “OK”
Step 44 – Certificate configuration Files created
The above Certificate files should have been created.
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SIMATIC customers have free use of the application tips. These tips are only a general approach to using SIMATIC with various applications. Your
specific application may be different. It is your responsibility to use SIMATIC properly in your applications.
Step 45 – IPsec VPN configuration text file
Open the text file that was created when the certificate was made for example
“Configuration1.m875demo.txt”. It will contain the following information:
IPSec VPN > Certificates
Upload Remote Site Certificate: Configuration 1.Group1.computer.cer
Upload PKCS12 File (.p12): Configuration 1.U0899EF2C@GD406.m875demo.p12
IPSec VPN > Connections > VPN Roadwarrior Mode - Edit Settings
Authentication method: X.509 Remote Certificate
Remote Certificate: Configuration 1.Group1.computer.cer
Remote ID: U1BEF40D2@GD406
IPSec VPN > Connections > VPN Roadwarrior Mode - Edit IKE
Phase 1 - ISAKMP SA
ISAKMP-SA encryption: 3DES-168
ISKAMP-SA hash: SHA-1
ISKAMP-SA mode: Main Mode
ISAKMP-SA lifetime (seconds): 86400
Phase 2 - IPSec SA
IPSec-SA encryption: 3DES-168
IPSec-SA hash: SHA-1
IPSec-SA lifetime (seconds): 86400
NAT-T: On
Activate Dead Peer Detection: Yes
DPD-Delay (seconds): 150
DPD-timeout (seconds): 60
DPD-maximum failure: 5
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SIMATIC customers have free use of the application tips. These tips are only a general approach to using SIMATIC with various applications. Your
specific application may be different. It is your responsibility to use SIMATIC properly in your applications.
Step 46 – IPsec VPN Configuration - Roadwarrior
Enable “Roadwarrior” mode and select “Save”. Select “IKE settings” “Edit”.
Step 47 – IKE Settings
From step 26 we get the following information to enter. Then press “Save”:









Encryption – 3DES-168
Hash (checksum) – SHA-1
Mode – Main mode
Lifetime(seconds) – 86400
NAT-T – On
Enable Dead Peer Detection (DPD) – Yes
Delay after DPD query (seconds) – 150
Timout after DPD query (seconds) – 60
DPD: maximum number of unsuccessful attempts - 5
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SIMATIC customers have free use of the application tips. These tips are only a general approach to using SIMATIC with various applications. Your
specific application may be different. It is your responsibility to use SIMATIC properly in your applications.
Step 48 – IPsec VPN – Certificates
The certificates page shows status information and certificates can be uploaded to the M875
Step 56 – IPsec VPN – upoad partner certificate
Browse to the directory where you saved the certificates. From step 43 we see that the file
needed is Remote Site Certificate: Configuration 1.Group1.computer.cer
Select the partner certificate you created and then “Upload”. It uploads almost instantly, the
certificate pah in “Browse” will no longer appear when complete.
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SIMATIC customers have free use of the application tips. These tips are only a general approach to using SIMATIC with various applications. Your
specific application may be different. It is your responsibility to use SIMATIC properly in your applications.
Step 49 – Upload PKCS12 file
Browse to the directory where you saved the certificates and select the file for the M875. From
step 43 we see that the file needed is PKCS12 File (.p12): Configuration
1.U0899EF2C@GD406.m875demo.p12
Enter the password that was created with the certificate and press “Upload”. The upload
happens very quickly.
Step 50 – Certificate validation
If everything matches there will be green check marks as shown. If not you will need to verify
that the certificates were created correctly and that the correct password and files were
uploaded.
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SIMATIC customers have free use of the application tips. These tips are only a general approach to using SIMATIC with various applications. Your
specific application may be different. It is your responsibility to use SIMATIC properly in your applications.
Step 51 – IPsec VPN Conections settings
Go back to the “Connections” tab and “Edit” Connection Settings.
Step 52 – IPsec VPN edit connections settings
From step 43 we get the following information: enter the data and press “Save”




IPSec VPN > Connections > VPN Roadwarrior Mode - Edit Settings
Authentication method: X.509 Remote Certificate
Remote Certificate: Configuration 1.Group1.computer.cer
Remote ID: U1BEF40D2@GD406
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SIMATIC customers have free use of the application tips. These tips are only a general approach to using SIMATIC with various applications. Your
specific application may be different. It is your responsibility to use SIMATIC properly in your applications.
Step 53 – Step 7 V5.5 project
Step 7 V5.5
TIA Portal V11
You should now be able to connect an S7 plc to your M875 and go online with it using the
Softnet Security Client and Step 7 software. Make sure the PLC configuration sets the IP addrss
to an IP address in the range of 192.168.10.x and use router 192.168.10.1. Unplug your pc from
the M875 and plug the PLC into the M875.
Step 54 – Start the Softnet Security Client
From the Windows “Start Menu” start the “Softnet Security Client”
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SIMATIC customers have free use of the application tips. These tips are only a general approach to using SIMATIC with various applications. Your
specific application may be different. It is your responsibility to use SIMATIC properly in your applications.
Step 55 – Load Configuration
Select “Load Configuration”
Step 56 – Select and open the Configuration file
You may get this message, just select “OK”
Select “Next” – this is shown if you have loaded a configuration previously.
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SIMATIC customers have free use of the application tips. These tips are only a general approach to using SIMATIC with various applications. Your
specific application may be different. It is your responsibility to use SIMATIC properly in your applications.
Step 57 – Select the DNS-Name
If using a static IP address verify that the IP address is correct. For our demo we are using a
dynamic address so we use the DNS-Name: - enter the DNS name for your system.
Step 58 – Describe the first topic
Select the computer’s Ethernet adapter that will connect to the internet. Also note that the IP
address at the top for the m875demo will either show the fixed IP address of the SIM card or the
DNS name that was used.
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SIMATIC customers have free use of the application tips. These tips are only a general approach to using SIMATIC with various applications. Your
specific application may be different. It is your responsibility to use SIMATIC properly in your applications.
Step 59 – Enter the Certificate Password
Step 60 – Enable the Tunnel
Step 61 – Tunnel Overview
Step 62 – Tunnel status
If the status is red, the connection has not yet been made.
Green status – tunnel is connected.
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SIMATIC customers have free use of the application tips. These tips are only a general approach to using SIMATIC with various applications. Your
specific application may be different. It is your responsibility to use SIMATIC properly in your applications.
Step 6
63 – Ping
g Internall IP addre
ess
Ping of the
t Internal IP address of the M87
75.
Step 6
64 – Ping
g PLC address
Ping of PLC
P
addresss
Step 6
65 – Online with the
t PLC
Step 7 V
V5.5
TIA Portal V11
When ussing the VP
PN Tunnel (S
Softnet Client) no special routing iss required frrom Step7 V
V5.5 or
the TIA Portal V11.
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34
SIMATIC customers
c
have frree use of the application tips. These
e tips are only a ge
eneral approach to
o using SIMATIC w
with various appliccations. Your
specific application may be diff
fferent. It is your re
esponsibility to use
e SIMATIC properrly in your applications.
Step 66 – Online with the PLC using the Webserver
Startup page of PLC Webserver using the IP address of the plc – 192.168.10.2 entered into
Internet Explorer or Firefox.
Step 67 – Online with the PLC Webserver – Diagnostics Page
Diagnostics page of PLC Webserver.
Copyright 2013 by SIEMENS
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SIMATIC customers have free use of the application tips. These tips are only a general approach to using SIMATIC with various applications. Your
specific application may be different. It is your responsibility to use SIMATIC properly in your applications.
Related Information
Additional Application Notes on M875:
http://support.automation.siemens.com/WW/view/en/24960449
Hardware and Software Considerations
Hardware Used:



M875 – 6GK5875-0AA10-1AA2
Antenna - 6NH9860-1AA00
S7-300 ET200S PLC - 6ES7151-8AB01-0AB0
Software Used:



Softnet Security Client V4 – 6GK1704-VW04-0AA0
o With Security Configuration Tool V3 – included with above
Step 7 Professional 2010 – 6ES7810-5CC11-0YA5
TIA Portal Professional V11 - 6ES7822-1AA01-0YA5
General Notes
The SIMATIC Application Tips are provided to give users of Siemens’ Simatic products some
indication as to how, from the view of programming technique, certain tasks can be solved.
These instructions do not purport to cover all details or variations in equipment, nor do they
provide for every possible contingency. Use of the Simatic Application Tips is free.
Siemens reserves the right to make changes in specifications shown herein or make
improvements at any time without notice or obligation. It does not relieve the user of
responsibility to use sound practices in application, installation, operation, and maintenance of
the equipment purchased. Should a conflict arise between the general information contained in
this publication, the contents of drawings or supplementary material, or both, the latter shall take
precedence.
Siemens is not liable, for whatever legal reason, for damages or personal injury resulting from
the use of the application tips.
All rights reserved. Any form of duplication or distribution, including excerpts, is only permitted
with express authorization by SIEMENS.
Copyright 2013 by SIEMENS
page 34 / 34
SIMATIC customers have free use of the application tips. These tips are only a general approach to using SIMATIC with various applications. Your
specific application may be different. It is your responsibility to use SIMATIC properly in your applications.