Rockwell Automation 5370-CVIM2 Module - Manual (Page 68)

5 Chapter Chapter 3
Image Acquisition Parameters
3–29
Camera Bank Switching
The CVIM2 system can service three cameras inputs at one time: cameras
#1, #2, and #3, or cameras #4, #5, and #6. The bank switch function provides
a means of switching between the two “banks” of cameras while the system
is operating online. (By default, cameras #1, #2, and #3 are always selected
after system powerup.)
NOTE: In order to use camera inputs #4, #5, and/or #6, you must install an
external +24VDC power supply as described in Chapter 1, Hardware
Connection and Powerup Check.
Bank Switch Mode
The bank switching function can be initiated either on command, from a
signal on a discrete input, or automatically, from a trigger signal to the
unselected camera bank. You can choose the switching mode by picking the
Bank Switch Mode field in the Acquisition System Settings panel. When
you pick this field, it toggles from On Command to Automatic , or vice
versa.
On Command –– This bank switch mode requires using a discrete input to
select the appropriate camera bank. For this purpose, you must pick the
Bank
Switch Command Input field to select an available input in either the
Module I/O or the System I/O discrete I/O editor panel.
When a signal level change occurs on the assigned input, the system switches
from one camera bank to the other. Thus, if cameras #1, #2, and #3 are
currently active, and the bank switch signal level is asserted, the system will
deactivate cameras #1, #2, and #3 and activate cameras #4, #5, and #6.
Subsequently, when the bank switch signal level drops, the system will
activate cameras #1, #2, and #3 and deactivate cameras #4, #5, and #6.
A delay will occur from the moment that the bank switch input level changes
until the system is ready to process triggers, as follows:
•
Polling latency delay: approximately 25ms to respond to the level
change, plus
•
Bank switch delay:
— Cameras across banks #1 and #4, #2 and #5, or #3 and #6 are
compatible (that is, both are free–running cameras, such as the
2801–YC or –YD, or both are frame reset cameras, such as the
2801–YE): approximately 80ms, or
— Cameras across banks #1 and #4, #2 and #5, or #3 and #6 are not
compatible (that is, one is a free–running camera, such as the
2801–YC or –YD, and the other is a frame reset camera, such as the
2801–YE): approximately 200ms.