RTDBItem-Copy

This is a pseudo device that copies output/input RTDB items (points) to chosen RTDB input/output items.
The configuration of what outputs/inputs to copy to what inputs/outputs is done via a similar panel as for other real I/O devices.
This copy function is implemented via 2 independent I/O tasks.

• Copy Output to Input:
  Using this I/O device allows outputs calculated by a model to be used as inputs to another model running in parallel with the first. The copy is done during the input cycle and is equivalent to an input I/O task. The net effect of this process is that the model whose inputs are a copy of the outputs of another model is effectively delayed by 1 frame.
• Copy Input to Output:
  Input items a re copied to output items during the model sub-cycle so that the copy is done before the output sub-cycle when outputs are written to the hardware.
  The same input item can be copied to several different (up to 16) output items.
  Using this functionality allows a RTDB item coming from an I/O device to replicated on different output devices.

Reference Information

I/O Module License:

This pseudo device does not require a license.

Mapping Table

The mapping panel allows you to map output to input for RTDB items of the same point type. That is, String Out (STRO) to String In (STRI), Analog Out (AO) to Analog In (AI), and Digital Out (DO) to Digital In (DI). Additionally, you can only map input/output items that have the same dimensions. However, items do not have to be of the same C type, i.e. double, float, int, etc. Nevertheless, the copy is faster when both source and destination items have the same C type.

To copy an output item to an input, select the input item on the left side under the Copy Output --> Input branch of the I/O Mappings form, then click on a check box for the output item on the right side of the form. See I/O Mappings... for details.

To copy an input item to an output, select the output item on the left side under the Copy Input --> Output branch of the I/O Mappings form, then click on a check box for the input item on the right side of the form.