Group usage – FANUC Robotics America GFK-1541B User Manual

Page 171

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TCP/IP Ethernet Communications for the Series 90™ PLC User's Manual

May 2002

GFK-1541B

5

Group Usage

The group concept in Ethernet Global Data exchanges allows many EGD devices to
simultaneously consume the same data produced by one producing EGD device. This capability
is valuable for efficient bandwidth utilization in systems where data may be shared among
multiple devices. This capability is made available by a technique called Multicasting. For more
information on Multicasting, see the topic “Multicast IP Addresses” in the chapter: “Network
Administration Support”.

Ethernet Global Data supports the use of 32 separate groups, each identified by a Group ID (1-
32). The EGD Group ID corresponds to a Multicast (Class D) IP address reserved by the Internet
authorities (IP addresses 224.0.0.0 through 239.255.255.255). The default Multicast IP addresses
used by EGD are:

Group ID

IP Address

1
2

.
.
.

32

224.0.7.1
224.0.7.2

.
.
.

224.0.7.32

These addresses are configurable within the Ethernet Interface using Station Manager, but are
considered Advanced User Parameters and should only be changed if necessary to avoid a
network conflict.

To enable group usage, configure the consumer exchanges to use the same Group ID (1-32) as the
producer of the exchange.

In the PLC programming software:

1. In the producer definition, choose Group ID as the Destination Type. In the Consumer

Address field, select a value between 1 and 32.

In the consumer definition(s), select the same value for Group ID that you entered in the producer
definition’s Consumer Address field. The value 0 implies no group usage.

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