Index table with Omron

Hi,

I am writing a program for an machine that has an index table with 8 stations.

The program is basically complete but I am having trouble with one feature. I want to be able to track certain features with a hift register and shift the information around the table from station to station. I am using the SFT function to do this.

Here is what I want to do: ( table has indexed and is in position)

cycle test station.
if bad part - load a value of 1 into the shift register.
index table - shift bit when command to index

I would keep shifting this bit every index until it gets to the takeoff station at which point it would:
a) drop it down a reject shoot because it is bad
or
b) drop it on a conveyor to go to a further process.

It seems that with the SFT instruction, both the I & P inputs have to be on in order to load a 1 but at the same time it shifts it.

Am I thinking about this the right way or should or is there another more better way to do this.

Please help

Thanks.

Which PLC are you working with? CS1, CJ1, CPM1A?
beerchug

I am using the CPM2A.

Not familiar with Omron, but what I try to do with a SR is to load a 1 every cycle initially (fail all) and reset that particular bit in the sequence when a good part is detected. This way you have less chance of a bad part entering further processes, and the 0 "good part" shifts to your eject station.
Sorry I can't help with the code.
tommy23t

It seems that with the SFT instruction, both the I & P inputs have to be on in order to load a 1 but at the same time it shifts it.....Am I thinking about this the right way

Click to expand...

Yep (well done, an ideal shift application), the reason why u need to turn on I and P....I is input ie 1 or 0, Good or Bad. The P is pulse input (mabey from an encoder) to shift the data on I so that you can keep track of it so that when the chute sees a 0 the chute is open and when it sees the 1 then it's closed.