Rockwell-automation 5370-CVIM2 Module User Manual download pdf (Page 467)

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Chapter 9

Discrete I/O Assignments

9–4

Hardware Interrupt

When a trigger is assigned to either input line on the Module I/O panel, or to

any of lines 0 through 3 on the System I/O panel, the CVIM2 system will

automatically process triggers using hardware interrupts. When a trigger

occurs, the CVIM2 system hardware responds immediately and diverts the

software operation to starting an inspection cycle. The system response time

to a hardware interrupt is in the microsecond range.

Note that triggers can be assigned to lines 4 through 15 on the System I/O

panel; however, the system will use the polling method to process triggers on

those lines. Since polling has a resolution in the millisecond range, it may be

too slow to process triggers; and, when trigger pulses are of short duration,

the system may miss some of those triggers.

Polling

When an input other than a trigger is assigned to any of the input lines, the

CVIM2 system will use polling to process the input, regardless of whether

the line is capable of performing hardware interrupt processing. When using

polling, the system software checks the state of the input line periodically (at

approximately 25ms intervals), and performs the appropriate operations

when is detects a change of state on the input line.

When the Module I/O format is on the monitor screen (see Figure 9.1, page

9–1), the top two rows of the table are dedicated to discrete input signal

assignments, while the 14 remaining rows are dedicated to discrete output

signal assignments. The inputs and outputs assigned in this panel are routed

to the Module I/O connector on the CVIM2 front panel.

Trigger Input Selections

As noted above, the first two discrete I/O locations are reserved for inputs

only. To assign a trigger source to either input, pick the corresponding box

under the Signal Name heading. When you do, the Input Signals menu

appears, as shown in the example in Figure 9.2 (page 9–5).

Note that only the trigger names that are defined in the currently selected

configuration file will appear in the Input Signals menu at this time. Since

most inspection applications must be synchronized with external events, such

as a sensor activated by parts or assemblies moving down a conveyor belt, a

trigger signal will normally be routed from such an external source.

Module I/O Functions

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Rockwell-automation 5370-CVIM2 Module User Manual Page 467

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