Combiner "pack" to separator "unpack" - item won't leave separator

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Bennett Foster asked Jul 23, '16 Ben Wilson edited Jul 25, '16

Combiner "pack" to separator "unpack" - item won't leave separator

I'm teaching a course and have an example problem with a combiner followed by a separator - to illustrate the various options.

It works fine until I have "pack" in the combiner and "unpack" in the separator. Then the first flow item out of the separator won't enter the next object (and of course everything backs up).

What do I need to know about combiners and separators that causes this to happen?

Software Version:

FlexSim 16.1.0

separator send to port blocked unpack

· 3

jing.c commented · Jul 24, 2016 at 01:33 AM

Hi Bennett, if you attach the model someone can help you easier.

1 ·

Joerg Vogel commented · Jul 25, 2016 at 08:06 AM

standard-combiner-separator-combination.fsm

Model is something like that?

0 ·

standard-combiner-separator-combination.fsm (16.9 KiB)

combiner-separator.jpg (109.0 KiB)

Bennett Foster Joerg Vogel commented · Jul 25, 2016 at 01:52 PM

That solves it. I needed 2 output queues for the separator. I only had one in the model. I had not assumed that it would segregate the flowitems after unpacking them from the packed flowitem. Putting in the second queue makes it work. (I had never worked much with separators before.)

THANKS!!!

0 ·

Answer 1 · 2016-07-25T16:38:18Z

Ben Wilson answered Jul 25, '16 Ben Wilson edited Jul 25, '16

The default separator Send To Port logic sends the container object out through port 1 and the contents through port 2:

If you keep the default Send To Port logic, but don't have a 2nd output port connection, then the contents will be stuck in the Separator and block anything new from entering.

So as you found, one solution is to create a 2nd output port so that the default Send To Port behavior can function properly.

You could also choose or create any number of other Send To Port behaviors, however. The list of preconfigured options includes standard entries like First Available, Random, Round Robin, etc., or as always you can customize the behavior or start a new option from scratch by editing the code.

separatorproperties.png (18.3 KiB)

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