ProSoft Technology MVI46-GSC - Manual (Page 43)

Reference MVI46-GSC ♦ SLC Platform
Generic Serial Communication Module
ProSoft Technology, Inc. Page 43 of 78
December 5, 2007
The processor inserts data in the module's M0 file to transfer to the module. The
module's program extracts the data and transmits the data out the
communication ports. Each port has a data area of 128 words (256 bytes) set
aside for the write operation. This large data area permits fast throughput of data
from the processor to the module.
The following illustration shows the data transfer method used to move data
between the SLC processor, the MVI46-GSC module and the serial devices.
As shown in the diagram above, all data transferred between the module and the
processor over the backplane is through the M0 and M1 files. Ladder logic must
be written in the SLC processor to interface the M-Files data with data defined in
the SLC user data files. The user is responsible for handling and interpreting all
data received on the application ports and transferred in the M1 file. Additionally,
the user is responsible for constructing messages to be transferred out of the
application ports by building the messages in the M0 file of the module.