Rockwell Automation GMLC Reference Manual - Manual (Page 398)

Publication GMLC-5.2 - November 1999
Read Remote Value 361
Selecting Wait for Linked halts execution of the program until the virtual
axis is in the selected On state. Because enabling a virtual axis can take up
to 10 milliseconds, this guarantees the virtual axis is ready before it is
used in subsequent blocks. In most cases, you should select Wait for
Linked.
If other tasks are executing (multitasking), the task that contains this
block pauses while the other tasks continue to execute. In this way, a Wait
for Linked selection in one task does not halt execution of any other tasks
or hang the task dispatcher.
When Wait for Linked is not selected, the program continues to execute
all subsequent blocks while the virtual axis is being enabled or disabled.
Read Remote Value
The Read Remote Value block allows one motion controller in an
AxisLink chain to request a user variable value, data parameter value, or
data bit state from another motion controller in the chain. The local
motion controller reads the selected item from the remote motion
controller with the specified address, and stores the returned value in a
selected local user variable. Typically, the value is returned in 3 to 5 ms,
but may take as long as 20 ms. Both motion controllers must have the
AxisLink option installed and enabled, and be connected on the same
AxisLink chain.
The Read Remote Value dialog box’s appearance differs depending on the
type you select.
The Read Remote Variable block resides on the Advanced Motion
Palette.
See the User Variable Type and Data Type for instructions on configuring
the two versions of this function block.