Disabling BootP

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When the BootP protocol is activated the controller expects the BootP server to be permanently available. If there is no BootP server available after a PowerOn reset, the network will remain inactive.

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You must then deactivate the BootP protocol so that the controller uses the configurated IP address from the EEPROM; this does away with the need for the BootP server to be permanently available.

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BootP must be disabled to assign the address permanently!

To apply the new IP address permanently in the fieldbus controller, BootP must be disabled.

This prevents the fieldbus coupler from receiving a new BootP request.

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The IP address is not lost when the BootP-Protocol is disabled!

If the BootP protocol is deactivated after addresses have been assigned, the stored IP address is retained, even after an extended loss of power, or when the fieldbus controller is removed.

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You can disable BootP in two ways:

• Disable BootP in WAGO-ETHERNET-Settings

• Disable BootP in the Web-based Management System

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Disable BootP in WAGO-ETHERNET-Settings

750-871 ETHERNET TCP/IP 2-port Controller

Do not connect Communication Cable when energized!

To prevent damage to the communications interface, do not connect or disconnect Communication Cable 750-920 respectively 750-923 when energized!

The fieldbus controller must be de-energized!

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1. Switch off the supply voltage of the fieldbus controller.

2. Connect the communication cable 750-920 or 750-921 respectively the

Bluetooth® Adapter 750-923 to the configuration interface of the fieldbus controller and to your computer.

3. Switch on the supply voltage of the fieldbus controller.

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After the power is switched on, the controller is initialized. The fieldbus controller determines the I/O module configuration and creates a process image. During startup, the I/O LED (red) will flash. After a brief period, the I/O LED lights up green, indicating that the fieldbus controller is operational.

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If an error occurs during start-up indicated by the I/O LED flashing red, evaluate the error code and argument and resolve the error.

More information about LED signaling

The exact description for evaluating the LED signal displayed is available in the section “Diagnostics” > … > “LED Signaling”.

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Error codes and error arguments are indicated by the frequency of a LED flash sequence. For example: Error code 6, followed by error argument 4, is indicated by the I/O LED after controller start-up with 6 red error code flashes, followed by four red flashes of the error argument. This indicates that an IP address has not yet been assigned.

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4. Start WAGO-ETHERNET-Settings program.

5. Click on [Read] to read in and identify the connected fieldbus node.

6. Select the TCP/IP tab.

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7. Select "Automatically obtain: DHCP Server " in the Settings box, or if

you want to assign a permanent address, select the "Use the following

addresses:" option (BootP is the default).

8. If you select the static configuration, enter the desired additional IP address

and optionally the subnet mask and the gateway.

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750-871 ETHERNET TCP/IP 2-port Controller 10. You can now close ETHERNET-Settings or make other changes in the

Web-based Management System as required. To open the Web-based

Management System click on the button [WBM] on the right side.

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Disable BootP in the Web-based Management System

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1. Open the Web browser on your client (such as the Microsoft Internet

Explorer) to have the HTML pages displayed.

2. Enter the IP address for your fieldbus node in the address line of the

browser and press [Return].

A dialog window then appears with a password prompt. This is provided for secure access and entails three different user groups: admin, guest and user. 3. As Administrator, enter the user name: "admin" and the password "wago". A start page is then displayed in the browser window with information about your fieldbus controller (start page can be changed on HTML page “PLC Settings”). You can navigate to other information using the hyperlinks in the left navigation bar.

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Disable the proxy server to display the web-based Management-System!

If these pages are not displayed for local access to the fieldbus nodes, you must define in the Web browser properties that, as an exception, no proxy server are to be used for the node IP address.

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4. In the left navigation bar click on Port to open the HTML page for selecting

a protocol.

750-871 ETHERNET TCP/IP 2-port Controller

Figure 46: WBM Page "Port"

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You are shown a list of all the protocols supported by the fieldbus controller.

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5. Select the option “DHCP” or “use IP from EEPROM” to disable the

BootP protocol.

You can also deactivate any other protocols that you no longer need in the same manner, or select desired protocols and activate them explicitly.

Since communication for each protocol takes place via different ports, you can have several protocols activated simultaneously; communication takes place via these protocols.

750-871 ETHERNET TCP/IP 2-port Controller

The controller IP can be changed in the network by the DHCP server!

If DHCP is enabled and a DHCP server (e.g. a router with active DHCP server) is installed in the network, addresses are automatically allocated from the address range of the DHCP server after a power failure (failure of the 24 VDC power supply of the controller).

That is to say that all fieldbus coupler/controllers with active DHCP receive a new IP address!

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Check the network for a DHCP server when using DHCP!

If you are using DHCP, then make sure that there is a DHCP server in the network and that an IP address can be assigned to the fieldbus controller before start-up. BACnet is not initialized without an IP address and no application is launched.

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6. Click on SUBMIT and then switch off the power to the fieldbus controller

(hardware reset), or press down the mode selector switch. The protocol settings are then saved and the fieldbus controller is ready for operation. If you have activated the MODBUS/TCP protocol, for example, you can now select and execute required MODBUS functions using the MODBUS master too, such as querying of the module configuration via register 0x2030.

If you have activated the WAGO-I/O-PRO for example, you can also program the

controller via ETHERNET link using WAGO-I/O-PRO in line with Standard

IEC-61131-3.

750-871 ETHERNET TCP/IP 2-port Controller

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