TMR Module T8331 ICS Triplex PLC Use For Automation System

ICS Triplex T8331 PLC Module

Ethernet Media Access Control (MAC) address configuration is held by the CI as part of its configuration information. Other information regarding port and protocol configuration is obtained from the TMR Processor, as part of the System.INI file.

To overcome this problem, when data is written to a Communications Interface, it is first passed to the TMR Processor and the write is acknowledged immediately by the Communications Interface (to avoid communications delays). The processor updates its own database and then sends the data back to all Communications Interfaces so that they all have the same data. This can take one or two application scans. This means that subsequent reads will receive the old data immediately after the write, until the new data has been distributed.

Data writes are more complicated. If a data write simply updated the local copy and was then relayed to the processor, the other Communications Interfaces in the system would carry different data. This may cause problems for redundant links.

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