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14-1-3 Application Examples
Today, there are already applications realizing the benefits of IEEE-1394 technology. For example, at one of our
customer sites, Basler was faced with a vision system which has the following specificatio ns:
The machine is a hig h-speed assembly system . Two indepe ndent robots take different par ts
(different in size, shape, and reflection) from a support unit and mount these parts on a mounting plate. Timing is
crucial, and in the worst case, a part must be taken from the tray every 100 ms. Accuracy of parts mounting is also
critical (0.5 mm) . To have a vision system inspecting these operations , 4 cameras (2 on each of the rob ots) are
needed:
- 2 low resolution Basler A302f camera s (640 x 480) for checking if the mounting plate is in place
- 2 high-resolution Basler A101f cameras (13 00 x 1030) for checking the components to be mounted.
Since most of the parts are differen t, the two A101f cameras must be reconfigured before almost every image
acquisit ion. In the worst case, the AOI, shutter, and som etim es gain need to be adjusted.
1) Solution used before Basler s Intervention
The customer used analog camera s with CCIR resolution (768 x 582) only. This drast ically restricted the number
of parts which could be mounted using the robots. Sin ce thes e camera s had no communication por t for config-
uration, adjusting the AOI was not possible and differ ences in reflection of the parts needed to be adjusted for by
driving a flash circuit. All cameras were interfaced into one frame grabber (one PC).
2) Possible solution wih digial cameas using RS 644 OR Camera Link
Using RS 644 or CameraLink based camera s, the customer would need one frame grabber for
each camera. It is very likely that the user would need two PCs (one for each robot). Changing the camera-config-
uration on the fly would require adv ance d grab ber cards since simple grabbers are not capable of easily chang-
ing their registers for different AOIs.
3) IEEE-1394 solution
All cameras are attached to a sing le interface card in the PC. The Basler A302f is only used when a new mounting
plate is pos itione d by the handler. In norm al operation , only the two Basler A101f cameras will be sending data
at the same time and they will be operating at about 10 FPS. This results in a data rate of about 27 MBytes/s,
which is well within the specification for IEEE-1394.
Since IEEE-1394 supports bi-directional communication between the camera and the PC, before each frame
capture , the PC can easily change resolution, gain , offset, shutter speed, or whatev er is required.
The IEEE-13 94 solution results in the se clea r advanta ges for the custom er:
- Onlyone PC,
- Only one inter face card (very inexpensive compare d with frame grabber cards ),
- Easy and inexpens ive cabl ing ,
- The system meet s the expect ations for spee d and accuracy,
- The range of inspect able parts is much bigger than with the old syste m.
Samsung Electronics
Reference Information
14-3
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