Bradley Smoker PLC-5 Programming Considerations, Forcing Inputs and Outputs, 13-11, 13-15

Chapter 13

Programming Considerations

Using This Chapter

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

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.

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

	When anything is forced on or off, keep personnel away
ATTENTION
	from the machine area. Forcing can cause unexpected
	machine motion that could injure personnel.

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.

Publication 1785-UM012D-EN-P - July 2005