Rockwell Automation 5370-CVIM2 Module - Manual (Page 477)

Chapter 9
Discrete I/O Assignments
9–14
For output signals, the +/– parameter determines whether an output will be
inverted. If “ Pos ” is selected (the default selection), the output is not
inverted, and its active state is on. If “ Neg ” is selected, the output is inverted
and its active state is off. Figure 9.9 illustrates this relationship. Pick the
appropriate box under the
+/– heading to toggle “ Pos ” to “ Neg ,” or vice
versa, for a particular output signal.
Figure 9.9 Example: Effects of Non–inverted and Inverted Output Selections
Off
On
Non–inverted output
(“Pos” selected)
Off
On
Inverted output
(“Neg” selected)
Output state
Output state
Output
active
Output
active
Force Selections
As described earlier, the Force parameter can alter the state of an output
when the system is online, according to which of the three choices is selected:
No , On , or Off . These are described briefly as follows:
No –– This is the default selection, and it causes the selected output to follow
the variations in the signal function that is assigned to it.
On –– This forces the selected output to go active and remain active as long
as the system is online.
Off –– This forces the selected output to go inactive and remain inactive as
long as the system is online. (Note that all outputs, except the strobe output,
are deactivated when the system goes offline.)