Global Data (Publish/Subscribe) Utility Configuration
Original instructions
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Overview
Whether you use either the Configure Each Device Separately or the Copy Configuration method, the procedure to configure individual parameters is the same. Therefore, in order to use the Global Data (publish/subscribe) utility in the NOE, you need to configure the Global Data parameters including:
The following sections describe in detail the exact steps to configure each parameter on the Global Data Configuration page.
Illustration
You can change the configuration in the Global Data Configuration page:
Configuring Global Data
After you have completed the Modeling System Configuration process using the second method, Copy Configuration, you modify the following parameters:
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. Members of this distribution group are configured to use the same group address; therefore, members can communicate with each other using Global Data.
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 (inoperable).
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.
  • I/O scanner health bits run left to right.
  • Global Data health bits run right to left.
Changing Global Data Variables
To change the Global Data variables that appear in the Variable Table area, follow the instructions below.
Step
Action
1
Highlight the identification number in the Data ID column.
2
In the Type column select the publish/subscribe variable type from the drop down list. Three options are available publish, subscribe, or none, displayed as:
  • NONE
  • SUB
  • PUB
3
In the Symbol column you may enter text to describe the variable.
4
In the Address column you see the application address for this variable.
Note: This is a read only field.
5
In the Length column for each row, type a value, which represents the number of 4x registers. The ending 4x register field is automatically updated. If you are using the second method, Copy Configuration, update Length the first time only.
6
When you are finished, click the Update Global Data Configuration button.
Verifying System Operation
To verify that the system is operational, do the following:
Step
Action
1
Verify that every controller is running.
2
Look at the health of variables using the Global Data Diagnostics page.
Follow these links: Diagnostics → Ethernet → Global Data