Rockwell Automation 1746-HSCE,D17466.5 High-Speed Counter Module - Manual (Page 155)

1 Publication 1746-UM006B-EN-P - August 2005
Appendix
B
M0 and M1 Files
This appendix contains important information you should know when
applying M0 and M1 files. This information supplements specific
information contained in earlier chapters of this manual.
M0 and M1 files are data files that reside in specialty I/O modules
only. The High-Speed Counter module only uses M0 files. There is no
image for these files in the processor memory. The application of
these files depends on the function of the particular specialty I/O
module. For some modules, the M0 file is regarded as a module
output file and the M1 file is regarded as a module input file. In any
case, both M0 and M1 files are considered read/write files by the SLC
5/02, SLC 5/03, SLC 5/04, and SLC 5/05 processors.
M0 and M1 files can be addressed in your ladder program and they
can also be acted upon by the specialty I/O module - independent of
the processor scan. It is important that you keep the following in mind
in creating and applying your ladder logic:
Addressing M0-M1 Files The addressing format for M0 and M1 files is below.
IMPORTANT
During the processor scan, M0 and M1 data can be
changed by the processor according to ladder
diagram instructions addressing the M0 and M1 files.
During the same scan, the specialty I/O module can
change M0 and M1 data, independent of the rung
logic applied during the scan.
Mf:e.s/b
Where M = module
f = file type (0 or 1)
e = slot (1-30)
s = word (0 to max. supplied by module)
b = bit (0-15)