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Modicon M580 automation platform Modicon M580 Communication modules Ethernet Global Data module

Presentation

Presentation Global Data service

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Distribution group 1

Data exchange 4 KB max.

IP multicast 239.255.255.251

Modicon Premium

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Modicon Quantum

Ethernet Modbus/TCP

Modicon Premium

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IP multicast 239.255.255.250 Modicon X80 modules platform + Modicon M580 processor

Data exchange 4 KB max.

Distribution group 2

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The Global Data service performs data exchanges in real time between stations belonging to the same distribution group. It is used to synchronize remote applications, or to share a common database between a number of distributed applications. Exchanges are based on a standard producer/consumer protocol, helping to ensure optimum performance with a minimum load on the network. This RTPS (Real Time Publisher Subscriber) protocol is promoted by Modbus-IDA (Interface for Distributed Automation), and is already a standard adopted by several manufacturers. Characteristics A maximum of 64 stations can participate in Global Data within a single distribution group. Each station can: b Publish one 1024-byte variable. The publication rate can be configured between 10 ms and 1,500 ms in increments of 10 ms. b Subscribe to between 1 and 64 variables. The validity of each variable is controlled by health status bits linked to a refresh timeout configurable between 50 ms and 15 s. Access to an element of the variable is not possible. The total size of subscribed variables amounts to 4 K contiguous bytes. To further optimize the performance of the Ethernet network, Global Data can be configured with the “multicast filtering” option which, together with switches in the ConneXium range, broadcasts data only to Ethernet ports where there is a Global Data service subscriber station. If these switches are not used, Global Data is sent in “multicast” mode to all switch ports. Global Data service diagnostics The diagnostic screens use a color code to show the Global Data status: b Configured/not configured/detected fault b Published/subscribed Global Data service diagnostics can be performed in one of four ways: b Via the application program from a specific PLC data zone b From the setup software debug screen b From the PLC system diagnostic function displayed by means of a Web browser on a PC station b Using standard SNMP manager software

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Global Data diagnostics

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