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Industrial Ethernet S7-300/400 CPs -- Setting up and parameterizing hardware -- Initializing and parameterizing modules
Why is there no entry with the current firmware version for my module in the STEP 7 hardware catalog?
What should you watch out for when a MAC address is entered for the PROFINET interface or GBIT interface in the configuration of the Industrial Ethernet CP343-1/CP443-1?
How do you configure a shared device when you are using a CPx43-1 Advanced as PROFINET IO controller and the GBIT interface of the module is networked?
Which "local_device_id" do you parameterize in order to establish a connection to FB65 "TCON" for open communication via Industrial Ethernet?
Which Industrial Ethernet CPs support the DHCP Option 12 (Host Name) and how do you configure the DHCP Option 12?
What should you watch out for when parameterizing the watchdog time when a ring redundancy is established with the Media Redundancy Protocol?
How do you use an Industrial Ethernet CP or SCALANCE S as a gateway?
How do you disable the "Link Layer Discovery Protocol" function at the ports of an IE CP of S7-300 or S7-400?
Where can you find sample S7 programs and documentation for communication via gateways and network components, and for security in networks on the SIMATIC NET Quick Start Collection?
What should you watch out for when operating a CP443-1EX20 V2.0 on a CPU V5.1?
Changing the configuration data of users for CP 343-1 IT and CP 443-1 IT
Loading the configuration via LAN into the IE-CP in "STOP" mode
Special points when setting the LAN medium for Industrial Ethernet CPs
Starting up automation systems with Industrial Ethernet without previous node initiation via MPI
Rejected diagnostics connection via TCP/IP protocol after changing the MAC address
Establishing an online connection to an S7-300/S7-400 CPU through several Ethernet interfaces
What should you pay attention to when formatting the file system in the S7-300 and S7-400 Industrial Ethernet CPs?
What should you watch out for when replacing the CP443-1 (6GK7443-1EX11-0XE0) with a CP443-1 (6GK7443-1EX20-0XE0 V1.0) in STEP 7 V5.4 SP3?
What is the meaning of the configuration option "Activate Web server" with CP443-1 EX20?
Why with CP443-1 Advanced is a different firmware version than the module displayed in the C-PLUG info text in the NCM S7 Diagnostics?
Which options are available for assigning the PROFINET IO controller a new IP address?
How can you configure an S7 CP during runtime?
How do you disable the S7 routing functions?
Which manufacturer ID, in other words OUI (Organizationally Unique Identifier), does SIEMENS AG use for the MAC addresses of network-compatible devices?
How can you protect the S7-300/400 against unauthorized access from the LAN (local area network)?
What should you watch out for when using the function block FB55 "IP_CONFIG" to configure an Industrial Ethernet CP?
Why are some of the newer versions of the names of SIMATIC NET modules not used in the hardware catalog?
Why can't my SIMATIC S7-300 Ethernet CP run as many S7 communication connections as specified?
How does connection multiplexing work and how do you configure it for SIMATIC S7-300 Ethernet CPs?
Which Industrial Ethernet CPs support the DHCP Option 12 (Host Name) and how do you configure the DHCP Option 12?
Part number:

Description
The Dynamic Host Configuration Protocol (DHCP) permits you to assign the network configuration to clients by means of a server.
The Dynamic Host Configuration Protocol was defined in the RFC 2131 and was assigned UDP ports 67 and 68 by the Internet Assigned Numbers Authority.

The various DHCP options are defined in the RFC2132.

DHCP Option 61 (Client Identifier)
The Industrial Ethernet CPs support the DHCP Option 61 (Client Identifier).

The DHCP Option 61 (Client Identifier) is used by DHCP clients to identify themselves uniquely on a DHCP server. This means that DHCP servers can trace the assignment of IP addresses and network administrators can thus also reserve addresses for specific interfaces. Therefore, within an administrative domain, unique values are also expected for all DHCP clients. Normally, the Client Identifier is the MAC address of the network interface card. However, for Industrial Ethernet CPs you can also manually enter the Client Identifier for each interface with DHCP support so that when you replace a CP, the same reserved IP address can be retained. In the case of some DHCP servers, however, the Client Identifier can also be used to register the assigned IP address on a DNS server.

For the Industrial Ethernet CPs the DHCP Option 61 is configured in the Hardware Configuration of STEP 7.

In the Hardware Configuration you double-click the PROFINET interface of the Industrial Ethernet CP to open the "Properties" dialog of the PROFINET interface.
Switch to the "IP Configuration" tab to enable the "Obtain IP address from a DHCP server:" option and enter the Client ID.


Fig. 01

DHCP Option 12 (Host Name)
For DHCP servers that require a host name for registering the IP address assigned to the Industrial Ethernet CP on the DNS server, the Industrial Ethernet CPs below support the DHCP Option 12 (Host Name):

  • CP343-1 Advanced (6GK7343-1GX30-0XE0 as from firmware V1.2)
  • CP343-1 Standard (6GK7343-1EX30-0XE0 as from firmware V2.4)
  • CP343-1 Lean (6GK7343-1CX10-0XE0 as from firmware V2.4)

Proceed as follows to configure the DHCP Option 12.
 
No. Procedure
1 In the Hardware Configuration of STEP 7 you double-click the PROFINET interface of the Industrial Ethernet CP to open the "Properties" dialog of the PROFINET interface.
Switch to the "IP Configuration" tab to enable the "Obtain IP address from a DHCP server:" option.

Note:
Optionally you can also enter the Client ID, in other words, assign the Client Identifier.


Fig. 02

2 Load the hardware configuration into the CPU.
Then the Industrial Ethernet CP requests its IP address based on its MAC address or an optionally assigned Client Identifier for a DHCP server. The SysName is not yet set in this phase and therefore cannot yet be transferred to the DHCP server so that it can register the assigned IP address together with the SysName as host name for the DNS server.
3 If the IP address has been assigned successfully to the Industrial Ethernet CP, the administrator must use exactly this IP address to set the SysName in the Industrial Ethernet with an SNMP Management Tool.
4 As from the next DHCP request, like DHCP DISCOVER or DHCP REQUEST, for example, in the case of Lease Time Extension or restart, the Industrial Ethernet CP then always transfers the SysName as Host Name to the DHCP server.

Note
In the case of Advanced CPs the SysName is stored in the C-PLUG. When you change a module, the SysName is retained if the old C-PLUG is slotted into the new module.
In the case of Lean and Standard CPs the SysName is stored in the onboard flash, in other words, when you change a module, you have to set the SysName anew.

 Entry ID:49588330   Date:2011-05-16 
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