Rockwell Automation 1747-SN Remote I/O Scanner - Manual (Page 60)

Publication 1747-UM013B-EN-P - January 2005
4-16 Scanner Configuration and Programming
M0 Control File Description
You can control the operation of individual devices on the RIO link
with M0 word 8 through M0 word 27 (M0:e.8 through M0:e.27).
Through your application program, you can use the M0 file to:
• Device Inhibit - command the 1747-SN RIO Scanner to stop
scanning an RIO device by using words 8 through 11.
• Device Reset - command an RIO device’s outputs to reset while
the SLC processor is in Run or Test mode by using words 16
through 19.
• Remote Output Reset - command an RIO device’s outputs to
reset upon the SLC processor leaving Run mode (regardless of
the RIO device’s Hold Last State setting), or while in Test mode
by using words 24 through 27.
If you do not modify the Device Reset and Remote Output Reset
words, the device outputs reflect the scanner output image whenever
the SLC processor is in Run mode. If the SLC processor is in Program,
Test, or Fault mode, it instructs the device to reset its outputs.
M file data is nonretentive. Upon entering Run or Test modes, the SLC
processor sets the M0 file to a default state. The processor does not
use the M0 file until a full program scan occurs (after entering Run
mode). This allows you to change the M file settings before they take
effect.
IMPORTANT
The 1747-SN RIO Scanner does not use M0 words 0
through 7.