User manual

Global Data (Publish/ Subscribe)
190
33002479 06 07/2008
Table of Global Data Planning Spreadsheet
Maximum size for the publish variable 512 registers = 512 Words (16 bits) = 1024
bytes
Maximum number of subscription variables
per device
64 (63 if this device is publishing)
Maximum size for the subscribe variables per
device
2048 registers = 2048 Words (16 bits) = 4096
bytes
Note: We recommend that you consider the following when planning.
z Allow for a 10 to 20 % increase in growth of any variable.
z Add variables at the end of the configuration where they do not affect the
existing application address. Therefore, you avoid changing the existing
addresses in your configuration, which can be a time consuming process.
Parameter Description
Parameter Checking Reserved
Variable Id Represents the Data ID on the NOE’s Global Data Configuration
Web page
Symbol Symbolic name for Global Data exchange.
Length Words
(Registers)
Length of Global Data information. Number of %MW words (4x
registers).
Device Number Number of devices (up to 64) for the Global Data network.
Variable Public.
Status
Automatic information of the correct publication status of the Global
Data network. Only by using the Microsoft Excel
TM
spreadsheet.
Information per symbol.
Device Publication
Status
Automatic information of the correct publication status of the Global
Data network. Only by using the Microsoft Excel
TM
spreadsheet.
Information per device.
Total Publication Size
per Node
Publication size for the specific node. The maximum publication size
is 512 words (registers) per node
Total Subscription
Size per Node
Subscription size for the specific node. The maximum subscription
size is 2048 words (registers) per node
Group IP Address
Enabled
IP address for multicast networking. Identifies the stations
distribution group. The address range is from 224.0.0.0 to
239.255.255.255
Multicast Filtering
Enabled
A check box for Ethernet switches that support multicast filtering.
Parameter Limit