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33002479 06 07/2008 285
Configuring
Global Data
After you have completed the Modeling System Configuration process (see
Modeling the System Configuration, p. 195) using the second method, Copy
Configuration, you modify the following parameters:
z Distribution period
z Health Time Out
z Health Bits location
z Start address
z Type: Pub / Sub / None
Please do not change Symbol (description), and Length.
To change the Global Data variables of the group box on the Global Data
Configuration page, follow the instructions below.
Step Action
1 Adjust the Distribution Period cycle. Enter a value from 1 through 50.
Note: Distribution Period is the minimum number of controller scan times before
an update occurs.
2 Before entering a value in the Group Address field, identify the station’s
distribution group. The Group Address entry will be an IP address from
224.0.0.0 through 239.255.255.255.
Group Address:the Class D Multicast IP address used for a distribution
group. All members of this distribution group are configured to use the same
group address, and therefore, all members can communicate with each other
using Global Data. t
3 Set the timeout in the Health Time Out field. This value is measured in milliseconds
and can be set to a value that ranges from 50 through 15000 ms (in 50 ms
increments)
Note: Health Time Out is the maximum time between received subscriptions
before a subscription is declared unhealthy (faulty).
4 In the 4x starting address, set the Data Zone field.
5 If you are connected to an Ethernet switch that supports multicast filtering, click the
Multicast filtering check box.
6 Enter %MW word (4x register) location for the Health Bits. This is the location for
storing health bits.
Note: Health bits run in different directions.
z I/O scanner health bits run left to right.
z Global Data health bits run right to left.