Rockwell-automation 5370-CUPK Color CVIM USER-PAK Option Manual de usuario descargar pdf (Pagina 57)

Chapter 6

Creating Custom Serial Port Messages

6 – 8

Figure 6.7 The Buffer box

Buffer box

Picking the Buffer box toggles the setting between Buffer: Wait and Buffer:

No wait.

Buffer: Wait

The two Buffer box settings are described below:

• Buffer: Wait – With Buffer: Wait selected, the Color CVIM transmits

your custom serial port messages with priority over inspection triggers.

That is, if one or more inspection triggers are received while the Color

CVIM is waiting to transfer a serial port message to the buffer, the

received triggers are rejected while the Color CVIM completes the

message transmission. This is a concern mainly if the trigger rate is fast

enough, and the serial message transmissions are long enough, to cause

triggers to be rejected.

Note: When a trigger is rejected, the Trigger Missed bit is set, and the

missed trigger count is incremented. (see the chapter on remote I/O in the

Color CVIM Communications Manual for more information on discrete

bits).

An advantage to selecting Buffer: Wait is that the serial messages can be

as lengthy as the time between triggers permits, and as lengthy as Color

CVIM memory allows. A disadvantage is the possibility that, in some

cases, some triggers may not be processed.

Buffer: No wait

• Buffer: No wait – This is the default setting. With Buffer: No wait

selected, the processing of inspection triggers has priority over the serial

port message transmissions.

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Rockwell-automation 5370-CUPK Color CVIM USER-PAK Option Manual de usuario Pagina 57