ProSoft Technology MVI46-DFCM - Manual (Page 56)

MVI46-DFCM ♦ SLC Platform Reference
DF1 Communication Module
Page 56 of 103 ProSoft Technology, Inc.
October 20, 2008
Main Logic Loop
Upon completing the power up configuration process, the module enters an
infinite loop that performs the following functions:
SLC Processor Not in Run
Whenever the module detects that the processor has gone out of the Run mode
(that is, Fault or PGM), the DF1 ports will be shut down. When the processor is
returned to a running state, the module will resume communications on the
network. No backplane data transfers will occur when the processor is not in run
mode.
Backplane Data Transfer
The MVI46-DFCM module communicates directly over the SLC backplane. All
data for the module is contained in the module's M1 file. Data is moved between
the module and the SLC processor across the backplane using the module's M-
files. The SLC scan rate and the communication load on the module determine
the update frequency of the M-files. The COP instruction can be used to move
data between user data files and the module's M1 file.