Parallel Operations Wrong Scheluding Times

[Former Member]

Hi PP Gurus

Hope you can help me out to figure out next issue:

I have this routing

Std. Sequence | Parallel Sequence

Op.10

Op.20 - WC 1 | Op. 20 - WC 2

Op.30

Op.40

Say the avaliable capacity for WC 1 and WC 2 is 100 units per hour in each one.

When making a PO of 1000 units I hope to see the total process time in Op. 20 of 5 hours because I have 2 work centers assigned to this operation. But isted of having this time reduced I the total time for operations 20 is 10 hours.

Can any one help me out to figure out this issue??

Thanks all

Elias

[Former Member · Accepted solution]

Hi,

As you split the Operation qty to two work centers, you need to mention "No. of splits=2" for the Operation 20. So use the std Processing formula= SAP002 in "Scheduling" tab in the work centre and check this to get the required result.

Hope this helps you..

[Former Member · Accepted solution]

Hi Thaila

I want to tnahk for your answer!!!

I have updated the capacity in my work center, passing from 1 to 2 capacities, then in the routing I check the "Required Splitting" and I update the "Maximum numbers of splittings" to 2. However the operations time remain the same... what can I do to make operations times going down?? is there any setting I missed???

thanks for your help

Elías

[Former Member · Accepted solution]

Hi,

Check up the formula that you have used in "Scheduling" tab in Work center. The formula you have used should have "Splits". So check up with the formula SAP002 for Processing.

Hope this will help you...

-Thaila Shree

[Former Member · Accepted solution]

Hi Thailia

Thanks for you help... the issue is solved without adding capacities to the work center.. I modify the WC formula so I can get the real times

Thanks

elías

[Former Member · Accepted solution]

Hi Elias,

I have the same case. How did you solve the problem?

thank a lot for info

[Former Member · Accepted solution]

Hi

The issue was solved using the "User Field" function in the routing and then modifying the WC formula...

SAP uses formulas in the WC to calculate the Scheduling time for a given operation, if you modify that formula you can get different times:

In my case I did next modifications:

1. First you have to specify a "User Field" under customizing (OPEC) ; say "SAP_14" (this field will store a value that will affect the work center formula)

2. Then you have to modify the WC formula (please be sure that you are affecting the formula that calculates the scheduling times).

I think SAP002 is the formula that calculates the scheduling times; this formula is the standar SAP formula to calculate the values, next you will find in detail how the formula works:

SAP_02 * SAP_09 / SAP_08 / SAP_11

But you need to divide this time into more the one machine... so you have to make this modification to the formula (you make this in customizing T.Code OPCS):

SAP_02 * SAP_09 / SAP_08 / ( SAP_11 * SAP_14 )

3. In the rounting you to specify the

Now, while defining the values for an operation in the routing you have to enter the this "user filed" value so you can have the right scheduling times:

Say for example that op. 30 is a parallel operation with 3 WC involved; so when you define the values for this operation in CA01 you have to enter in the "user Field" section the value 3. In this way you will divide the total scheduling time by 3. Please remember that you will have to do the same in the 3 wc that are involved.

Hope this have been useful to you..

Elías

[Former Member · Accepted solution]

Hi Elias,

Thank you for detail information. I did your instruction step-by-step but did't get the expected result.

Using your example, I have the following operation:

WC1 - WC2A - WC3 --> main sequence

- WC2B - --> parallel sequence

and PO is 1000 units with production rate 100 unit/hours. I expected that the total processing time in each WC2A and WC2B will be 5 hours. Unfortunately, I found 10 hours for WC2A and 10 hours for WC2B.

Is there anything else I have to configure?

thank you for help.

[Former Member · Accepted solution]

Hi Elias,

Got it! The formula calculating capacity requirement needs to be changed as well.

thank for the idea.

[Former Member · Accepted solution]

Hi again

You are right, the formula in the work center needs to be changed as well, and remember, if you are NOT working with parallel operations you need to maintain the User Field values as 1 for those WC where you have modified the formula if you do not maintain this value as 1 you might get errors while releasing a PO.

Elias

[Former Member]

Hi,

Pls check whether you ticked the NO.OF SPLIT in the Routing

Maintian the no of split as 2 in the operation 20

Thanks VRAJ

[Former Member]

Hello Elias

the operation time could depend upon:

- formula for the scheduling in WC (Fixed or variable)

- operation & base quantity for each operation

In the right case you should have an operation quantity of 500 Unit for each operation 20 (in each sequence). And infyour base quantity is 100 Unit, the standar value for operation time 1 hour and a variable formula, i.e., time= 1 hour * operation quantity / base quantity, then each operation should have 5 hours time.

Regards