Setup guide

Chapter 3 Driver and Protocol Objects
©
Automationdirect.com 3-35 Object Reference Manual
DeltaTau
DeltaTau is a protocol driver object class Lookout
Direct
uses to
communicate with Delta Tau Data Systems PMAC Motion Controllers.
Create a DeltaTau object for each card installed in the computer.
This object class communicates with Delta Tau PMAC cards through
dual-ported memory, so be sure that your PMAC hardware includes the
dual-ported RAM option.
The following figure shows a Delta Tau card configured to use PC memory
beginning at address D000.
Card base address specifies the beginning memory location of the dual
ported RAM address. It should match card settings.
Scanning Interval identifies the frequency that the DeltaTau object in
Lookout
Direct
polls the PMAC Motion Controller. Intervals can range
from 10 ms to 1,000 ms.
Communication alarm priority specifies the priority level of alarms
generated by the object.
DeltaTau Data members
Like other protocol driver objects, DeltaTau objects contain a great deal
of data. All readable and writable members (inputs/outputs), polling
instructions, and so on, are bundled with the object. Therefore, as soon as
you create a DeltaTau object you immediately have access to all the object
data members. The following table lists data members for the DeltaTau
object.