MVI94-GSC-E
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FLEX Platform
Reference
Generic ASCII Comunication Module
User Manual
Page 38 of 60
ProSoft Technology, Inc.
July 6, 2009
Flex Processor Not in Run
Whenever the module detects that the processor has gone out of the Run mode
(for example, Fault or PGM), the application port can be shut down as prescribed
in the user configuration. When the processor is returned to a running state, the
module will resume communications on the serial network.
4.2.2 Backplane Data Transfer
The MVI94-GSC-E module communicates directly over the FLEX backplane.
Data travels between the module and the Flex processor across the backplane
using the module's input and output images. The update frequency of the images
is determined by the ladder logic scan rate and the backplane bus rate.
Data received on the application port is placed in the module's input image. This
data is processed by the ladder logic in the Flex processor. The input image for
the module is set to 16 bytes.
The processor inserts data in the module's output image to transfer to the
module. The module's program extracts the data and transmits the data out the
communication port. The output image allowed for data to the module is set at 14
bytes.
The following illustration shows the data transfer method used to move data
between the Flex processor, the MVI94-GSC-E module and the serial devices.
