The image processing has to send a pass/fail message before the reject gate is reached by the
product. As well as “Resync mode” the “default to pulse” flag is set. This means that if the image
processing software does not send a pass/fail message OP2 is pulsed anyway.
In this example, three product triggers were received. The camera was triggered using OP1.
An Ethernet message with tag number 10 was sent to the host computer when the first trigger
was received, but for some reason a reply was not received, so the product was rejected for fail-
safe operation. After the second trigger a Tag 11 message was sent, with the reply “SN2,11,1”
(OP2, tag 11, pass) so the reject pulse on OP2 was cancelled. After the third trigger a Tag 12
messages was sent, with the reply “SN2,12,0” (OP2, tag 12, fail) so the reject pulse on OP2 was
not cancelled.
6.3.7
Resync and FIFO Mode
This uses the same situation as the previous example, but products are 4 seconds apart, so that
when a product is detected, there are already two others travelling towards the reject gate.
Image processing software processes the image (which can take a variable length of time) and
then sends a pass/fail message to the CC320. The pass/fail is re-synchronised to the original
product presence and the reject gate is opened if necessary.
