55Publication 1756-PM004C-EN-P - October 2009 55
Chapter
3
Force I/O
Introduction
Use a force to override data that your logic either uses or produces. For
example, use forces to:
• test and debug your logic.
• check wiring to an output device.
• temporarily keep your process functioning when an input device has
failed.
Use forces only as a temporary measure. They are not intended to be a
permanent part of your application.
Precautions
When you use forces, take these precautions.
Forcing can cause unexpected machine motion that could injure personnel. Before
you use a force, determine how the force will effect your machine or process and
keep personnel away from the machine area.
• Enabling I/O forces causes input, output, produced, or consumed values to
change.
• Enabling SFC forces causes your machine or process to go to a different state or
phase.
• Removing forces may still leave forces in the enabled state.
• If forces are enabled and you install a force, the new force immediately takes
effect.
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