Assigning Internet Protocol (Ip) Addresses; Assigning Ip Addresses To Programming And Network Devices - Siemens S7-1200 System Manual

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Assigning Internet Protocol (IP) addresses

If your programming device is using an on-board adapter card connected to your plant LAN

(and possibly the world-wide web), the IP Address Network ID and subnet mask of your CPU

and the programming device's on-board adapter card must be exactly the same. The

Network ID is the first part of the IP address (first three octets) (for example, 211.154.184.16)

that determines what IP network you are on. The subnet mask normally has a value of

255.255.255.0; however, since your computer is on a plant LAN, the subnet mask may have

various values (for example, 255.255.254.0) in order to set up unique subnets. The subnet

mask, when combined with the device IP address in a mathematical AND operation, defines

the boundaries of an IP subnet.

In a World Wide Web scenario, where your programming devices, network devices, and IP

routers communicate with the world, you must assign unique IP addresses to avoid conflict

with other network users. Contact your company IT department personnel, who are familiar

with your plant networks, for assignment of your IP addresses.

Unauthorized access to the CPU through the Web server

Unauthorized access to the CPU or changing PLC variables to invalid values could disrupt

process operation and could result in death, severe personal injury and/or property

Enabling the Web server allows authorized users to perform operating mode changes,

writes to PLC data, and firmware updates, Siemens recommends that you observe the

following security practices:

• Enable access to the Web server only with the HTTPS protocol.

• Password-protect Web server user IDs (Page 604) with a strong password. Strong

• Do not extend the default minimum privileges of the "Everybody" user.

• Perform error-checking and range-checking on your variables in your program logic

S7-1200 Programmable controller

System Manual, 03/2014, A5E02486680-AG

passwords are at least eight characters in length, mix letters, numbers, and special

characters, are not words that can be found in a dictionary, and are not names or

identifiers that can be derived from personal information. Keep the password secret and

change it frequently.

because Web page users can change PLC variables to invalid values.

5.7 Configuring the CPU for communication

Device configuration