Rockwell Automation 1503VC IntelliVAC Plus Contactor Control Module - Manual (Page 148)

DeviceLogix 9-25
1503-UM054C-EN-P – June 2013
Note:
A double arrow will appear on the connection for which data
has been assumed available to indicate its status.
Figure 9.13 – Assume Data Available
Assume Data Available (alternate method)
There is an alternate technique for creating feedback loops. It is
recommended that this method be used for more complex feedback
loops, or for bits which must be fed back to multiple input locations.
The alternative method makes use of the dual bit functionality of the
“Interim 1-5” bits. In order use the alternate method connect the
output portion of the dual function bit to the output of bit to be fed
back, then simply connect the input portion of the bit to be fed back
to the feedback input. Figure 9.14 illustrates the same logical
implementation of as figure 9.13 using this alternative method. For
further information regarding dual function bits refer to “Dual
Function Bits” description further in this chapter.
Figure 9.14 – Assume Data Available Alternate Method
Forcing
The DeviceLogix Function Block Editor provides troubleshooting
capabilities by allowing you to force inputs and outputs that allow
you to verify the run time result of your logic.
To aid in troubleshooting and debugging your schematic, you can
force hardware inputs, and outputs. No other inputs or outputs can be
forced within the Function Block Editor. Network inputs can be
forced in the device from where they originate. If you exit the
Function Block Editor with a force enabled, that force will remain in
effect until you remove it.