GE IC800SSI228RD2-CE Gas turbine module

Backplane Data Transfer The MVI46-MNETC module communicates directly over the SLC backplane. Data is paged between the module and the SLC processor across the backplane using the module's input and output images. Typical updates are in the range of 1 to 10 milliseconds. This bi-directional transference of data is accomplished by the module filling in data in the module's input image to send to the processor. Data in the input image is placed in the M1 file in the processor by the ladder logic. The processor inserts data to the module's output image to transfer to the module. The module's program extracts the data and places it in the module's internal database.

The following illustration shows the data

 transfer method used to move data between the SLC processor, the MVI46-MNETC module and the Modbus TCP/IP Network.All data transferred between the module and the processor over the backplane is through the M1 file. Ladder logic in the SLC must interface the input and output image data with data defined in the SLC data files. All data used by the module is stored in its internal database. This database is defined as a virtual Modbus data table with addresses from 0 (40001 Modbus) to 4999 (45000 Modbus).

Module’s Internal Database Structure

Data contained in this database is paged through the input and output images by coordination of the SLC ladder logic and the MVI46-MNETC module's program. Up to 128 words of data can be transferred between the module and the processor per ladder logic scan. Each image has a defined structure depending on the data content and the function of the data transfer. The following table lists the block numbers used by the module.

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