I/NET Global and Indirect Points Overview and Recommendations

Issue

Some issues which this article covers are:

What rules or recommendations should be used with Indirect and Global Points?
Why might a global point not change?
Attempting to alter a global AO/DO points' value/state, by "Point Control" without "Manual Mode" being used, and the change does not take place. (Referred to as Global Output Retentive Feedback.)
What scan rates should be used for global / indirect points?

Product Line

TAC INET

Environment

I/NET Software

Cause

Often within a system, a point's status or value within one controller has to be shared or used in other controllers connected to the system. An example could be an outside air temperature sensor connected to a controller. The value of the outside air temperature in that controller can be transmitted across the I/NET network to be used in algorithms in the other controllers.

The I/NET software and firmware provides the mechanism to transmit and receive point data system wide. The outside air temperature point in this example would be called a "global point." The receiving points within the other controllers that reference and thereby mimic the global point's temperature value are called "indirect points."

Resolution

Each controller is capable of a total of 128 global and indirect points. Global points are used to s...

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I/NET Global and Indirect Points Overview and Recommendations

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