Rockwell Automation 1785-Lxxx Enhanced and Ethernet PLC-5 Programmable Controllers - Manual (Page 219)

1 Publication 1785-UM012D-EN-P - July 2005
Chapter
13
Programming Considerations
Using This Chapter
Forcing Forcing I/O lets you turn specific input and output bits on or off for testing
purposes. Forcing bits on or off or forcing SFC transitions lets you simulate
operation or control of a device.
Forcing Inputs and Outputs
You can forces bits directly from the ladder editor or the force monitor screens
in your programming software. After you configure which bits to force, you
must enable forces before the forces take effect.
You can only force live I/O points, which are bits in an input or output word
that are physically attached to and configured for your system.
For Information About Go to Page
Forcing 13-1
Extended forcing 13-2
Using special programming routines 13-10
Priority scheduling for interrupts and MCPs 13-11
Defining and programming interrupt routines 13-15
IMPORTANT
Forcing inputs lets you force the bits in the input image file.
Forcing output lets you force the actual output module,
leaving the output image table file in its original state.
Forces are held by the controller (and not the personal
computer). Forces remain even if the personal computer is
disconnected
ATTENTION
When anything is forced on or off, keep personnel away
from the machine area. Forcing can cause unexpected
machine motion that could injure personnel.