Weighing and filling system using SIWAREX WP231

Sir,

I have gone through the Sample project on SIWAREX WP231on the Entry ID:82454336.

http://support.automation.siemens.com/WW/view/en/82454336

But i didn't understand the consept of filling.

In the project it using a 3kg load cell and and weighing wall dowels.

Let say one carton consist of 1000 wall dowels and got a total weight of 500g. so each wall dowels weight 0.5g.

so the target weight is 500g. please explain me how it control the output when reaching 500g.

I just confuse as in the SIWATOOL configuration file its difault limit values Limit1=99% and limit2=50%

if so as the max weight set is 3000g. for the slider to close,from what i understand it should close when weight value reach 2970g. So how to control the product to target 500g.

Also didnt understandy why it used CSM 1277 ethernet switch and link with siwarex.

Is it just to configure siwarex with siwatool or need to communicate online?

I already done the project for liquid filling with SIWAREX WP231 for filling 3kg and 5kg.

As got different kind of liquid the density also vary.

So i need to set different limit values for different products to cut off the valve at the set limit values.

As i cannot use siwatool all the time to change the limit % to change a product and also the DR6 is also locked. i used the modbus communication in parallel to the plc so change the limit values.

Now the fillier is set to production..

The one issue is sometime the read write command not working even the modbus is communicating properly.

the other issue is i use the set zero command which is direct command through plc. but it also sometime fail..

I am waithing for the new firmware which suppose to unlock all the data records and can control all settings through the plc.

Anyhow this sample project give me a hope. but confused as because of the weighing procedure..

will this sample project can be useful for my liquid and powder filling for a machine with multiple weight filling..