Ethernet Global Data; The Frequency Of Sending/Receiving An Exchange; The Consumer Update Timeout Period - Emerson PaCSystems VersaMax Series User Manual

User Manual
GFK-1503F
13.4

Ethernet Global Data

Ethernet Global Data is data that is automatically sent from one Ethernet device to one or
more others. Once Ethernet Global Data has been configured, the data is sent automatically
during system operation. No program interaction is necessary to produce or consume the
global data.
The device that sends the Ethernet Global Data is called the producer. Each device that
receives Ethernet Global Data is called a consumer. Each unique Ethernet Global Data
message is called an exchange.
Figure 205
Ethernet Global Data provides simple, regular communication of data between devices. It
should not be used for event notification if possible loss of data would be significant.
VersaMax CPU IC200CPUE05 can be configured for up to 32 produced Ethernet Global Data
exchanges (total of Produced and Consumed) s. Each Ethernet Global Data exchange must
be configured individually for each PLC and consists of one or more data ranges. See chapter
6 for configuration information.
13.4.1

The Frequency of Sending/Receiving an Exchange

During configuration, the repetition period of each Ethernet Global Data exchange is set up
for the producer. The range is 10 milliseconds to 1 hour, which is selectable in increments
of 10 mS. It is not necessary to produce and consume data faster than the application
requires. This reduces the load on the network and on the devices, providing capacity for
other transfers.
13.4.2

The Consumer Update Timeout Period

As part of the configuration for each consumed exchange, a "timeout period" can be set up
for the exchange. The CPU reports an error if the first or subsequent packet of data has not
arrived within the specified time. The range is 0 for no timeout detection, or 10 to 3,600,000
milliseconds. The consumer's timeout period should be greater than the producer's
repetition period. Emerson recommends that the consumer timeout be set to no lower than
twice the production period,
Ethernet Communications
Chapter 13
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