Rockwell Automation 5370-CVIM2 Module User Manual

Page 466

Chapter

Chapter 9

Discrete I/O Assignments

9–3

•

Cancel –– Use the

button to exit to the main menu bar without

saving any of the additions or changes in the I/O panel.

•

Module I/O –– Use the

button to select the

I/O Device

panel,

from which you can select the other I/O panels: the

System I/O

panel,

the

LED Outputs

panel, and the

Remote I/O

panel. The current selection

appears in this button.

•

Goto –– Use the

button to access the second half (rows 8 through

15) of the

Module I/O

System I/O

panels when you are using an

Allen–Bradley Catalog No. 2801–N8 color monitor, or equivalent
RS–170 monitor in the panel.

When you are using a VGA monitor, the button is active only when the

Remote I/O

panel is selected. In this case, the

button selects the

keyboard, which you can use to access a specific remote I/O address.

Note that the

Discrete I/O Editor

panel appears in four formats, according to

the selection that you make in the

I/O Device

panel:

Module I/O

System

I/O

LED Outputs

and

Remote I/O

. The differences between these four

panels are described in the remaining sections of this chapter.

Relation of Discrete I/O Assignments to Configuration File

Discrete I/O assignments are described in files whose file type name is
“

Discrete I/O

” in the EE or other filer. The

Discrete I/O

files are created

(named) in the

Config Files

panel, using the same methods that are used to

create the configuration, message, and acquisition configuration files, and
described in Chapter 4, Inspection Configuration under the Configuration
Process heading on page 4–2.

Multiple files can be named under the “

Discrete I/O

” file type name;

however, only one can be selected for a particular configuration file and
“saved” as part of that file. The effect is that when an existing configuration
file name is selected, the associated discrete I/O file is automatically
accessed.

Discrete Inputs: Interrupt Processing vs Poll Processing

The CVIM2 system uses two methods to process input signals: interrupt,
and polling. The main difference is that the interrupt method is faster than
the polling method; thus, this method is preferable for inputs that generally
require immediate response, such as triggers. The polling method is adequate
for inputs that are less time–critical, such as bank switching.