DHCP Servers

Overview

CAUTION

INCOMPLETE IP ADDRESSING

Do not configure the PLC in automatic start in RUN mode else some stations such as the Momentum 170s may not obtain their IP address when the DHCP server restarts.

Failure to follow these instructions can result in injury or equipment damage.

In this context, the module is used as a server for starting up client stations.

In listen mode, the server responds to the clients’ requests and sends them their IP address configuration.

To do this, the server device has a table, which groups:

Correspondence between the MAC addresses or the Names (Role Names) of the client stations and the IP addresses
The Netmask and the Gateway
The names and access paths to the parameter files (see Replacing Faulty Remote Stations)

NOTE: The server (present on the TSX ETY and TSX ETY PORT modules and the Ethernet link of the TSX P57 6634/5634/4634) only supplies network configuration data to client stations connected to the local area network.

When a module is used as a server for starting scanned stations, you must avoid configuring the PLC in automatic start in RUN mode. If you do not, there is a risk that stations such as the Momentum 170s will not be able to obtain their IP address when the DHCP server restarts.

Example of DHCP Server

The following diagram shows the routing of requests when responding to a start-up request from the server:

NOTE: The subnetwork mask and the address of the gateway belong to the DHCP server.