Rockwell Automation 1747-DSN DISTRIBUTED I/O SCANNER - Manual (Page 29)

Chapter 3
Configuration and Programming
3–11
The Output Disable bit can be used anytime that the SLC processor is in run
mode. The bit has no effect when the processor is in program/test/fault
mode. The Output Disable bit is not affected by, and does not affect, the bits
for Data Valid or Number of I/O Blocks.
The application example shown below illustrates the use of the Output
Control Word to configure the scanner for the number of I/O blocks on the
DIO Link and to start the scanner communicating with the I/O blocks.
In the following application, an input from a float switch is monitored.
When the switch contacts close, the pump starts pumping water into the
water tower. When the proper level is achieved, the switch opens and the
pump stops.
ACME
Water Towers
Float Switch
Pump
Input to I/O block
Output to motor starter
that starts pump
Milwaukee, Wisconsin
Application Example