Delta RMC101 User Manual download pdf (Page 303)

100

101

Ethernet 5.2

Communications 5-53

Selecting a Configuration Method

The first decision to be made is the method you will use to configure the IP address of your

device. Here are the three options selected in the TCP/IP tab of the Ethernet Options dialog box:

• Manually specify an IP address

Using this method, the administrator keeps a record of all IP addresses assigned for each network,

as well as the subnet mask and default gateway of the network. To use this method, click Specify

an IP address, and enter each of the three parameters. If you are creating a stand-alone network,

see Setting up a Stand-alone TCP/IP Control Network for suggestions on values to use, otherwise

consult your network administrator. An example record for a network might look like this:

• Obtain IP address, subnet mask, and default gateway from a BOOTP server.

This option causes the RMC to utilize the BOOTstrap Protocol (BOOTP) to determine its IP

address, subnet mask, and default gateway. When the RMC powers up, it broadcasts a request for

its IP parameters. If a BOOTP server is available on the network, then the BOOTP server will look

into a database of mappings from MAC addresses to IP addresses for the MAC address of the

RMC that sent the request. If it finds a match, it will give the RMC an IP address, default gateway,

and subnet mask. If no BOOTP server responds—either because no BOOTP server exists, or the

RMC's MAC address was not found in the BOOTP server's database—the RMC's Ethernet

communication channel will not be usable.

If you wish to use BOOTP, contact a network administrator for details on purchasing or obtaining a

shareware BOOTP server.

• Obtain IP address, subnet mask, and default gateway from a DHCP server.

This option utilizes the Dynamic Host Configuration Protocol (DHCP) to determine the IP

parameters in the same way that BOOTP is used for the above option. In fact, DHCP is an

extension of BOOTP and adds two features: dynamic selection of IP addresses from a pool of

addresses, and lease times for addresses.

The first feature works well for many office situations because each PC can use DHCP, so there is

no need for the user to enter a database of each individual IP address and MAC address. Instead,

a range of IP addresses is specified, and IP addresses are assigned as they are requested.

However, this does not work in industrial situations because most PLCs require that devices refer

to one another by IP address. This is not possible if the IP addresses of the devices change from

time to time.

The second feature is also not very usable in industrial situations. It allows each address

assignment to be assigned for a limited amount of time (in hours or even days). This is intended to

be used in conjunction with dynamic IP address assignment to avoid running out of addresses in

the pool.

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