Production orders are scheduled automatically depending on the following:

- A production order position in the queue.

Production orders with a higher position are scheduled first. - A production order start date.
- The sequence of operations in the bill of materials (BOM).
- Planning intervals of production departments.
- Availability of the work centers or work center types.

For each production order, scheduling steps are the following:

- Determine the sequence of operations as follows:
- If all operations consume components from stock, take the sequence from the BOM’s
**Operations**tab. - If an operation consumes a component that must be produced, include a sequence of operations from the component BOM. In the resulting sequence, these operations precede the operation that consumes the component.

- If all operations consume components from stock, take the sequence from the BOM’s
- Schedule operations from the sequence.

## Scheduling operations from sequence

Operations are scheduled according to the following rules:

- Find the work center types assigned to the operations.
- Find the work centers included in the work center types.
- Find Planning intervals of production departments that include work center types.
- Check the work centers availability. If a work center type is not assigned to an operation, check the work schedule of a company specified in the production order.
- Determine an operation start date as follows:
- If an operation is the first in the sequence, its start date is the production order start date.
- If an operation is NOT the first in the sequence, its start date is the date closest to the end date of the previous operation.

- For each operation, determine how many times it is performed to produce the ordered product quantity. Do one of the following:
- If in the BOM, the
**Fixed**check box is cleared for an operation, calculate the quantity of operations by the following formula:*Quantity of operations = product Quantity in a production order / product Quantity in BOM*If the resulting number is not integer, round it up.

- If in the BOM, the
**Fixed**check box is selected for an operation, assume that operation is performed once.

- If in the BOM, the
- For each operation, schedule the determined quantity of the operations on the planning intervals closest to the operation start date according to the work center availability or a company’s work schedule.
- For each operation, determine the end time as follows:
a. Find the last planning interval that the operation is scheduled on.

b. Take the end time of this interval.

## Production scheduling example

The production orders queue contains two production orders:

Number | Description | Priority | Start date | Due date |
---|---|---|---|---|

01 | Production order for 2 stools | High | 03.07.2020 | 06.07.2020 |

02 | Production order for 8 stools | Medium | 03.07.2020 | 06.07.2020 |

BOM for 1 stool includes the following:

Operations

Operation number | Next operation | Operation | Standard time | Fixed |
---|---|---|---|---|

1 | 0 | Stool assembling | 1 min | No |

Components

Component | Quantity | Unit | Operation | Produce | Bill of materials |
---|---|---|---|---|---|

Stool leg | 4 | pcs | Stool assembling | Yes |
Stool leg BOM for 5 legs |

Stool seat | 1 | pcs | Stool assembling | No |

A work center type is not assigned to the Stool assembling operation. This means that a company can perform this operation any number of times on any date within the company’s work schedule. The schedule is 5 work days a week starting from Monday. A work day is from 8 AM to 5 PM.

**Stool leg BOM for 5 legs** includes the following:

Operations

Operation number | Next operation | Operation | Standard time | Fixed |
---|---|---|---|---|

1 | 0 | Wood sharpening | 10 min | No |

Components

Component | Quantity | Unit | Operation | Produce | Bill of materials |
---|---|---|---|---|---|

Beam | 2 | m | Wood sharpening | No |

Details of the work center type assigned to the Wood sharpening operation:

Operation | Standard time | Work center type | Work center | Department | Planning interval |
---|---|---|---|---|---|

Stool assembling | 10 min | Wood sharpening equipment | Wood sharpening machine | Production | 5 min |

These details show that the Wood sharpening machine is assigned to the Wood sharpening operation. This operation is performed in the Production department with the planning interval of 5 minutes. The Wood sharpening machine is available according to its availability schedule.

### Scheduling flow

The scheduling flow includes the following:

- Production order 01
- Production order 02

#### Production order 01

The Production order 01 for 2 stools is on the top of the queue. So, it is scheduled first.

The scheduling steps are the following:

- According to BOM, the following is required to produce 1 stool:
- Complete 1 Stool assembling operation.
- Produce 4 stool legs before performing the Stool assembling operation.
- To produce 4 stool legs, complete the Wood sharpening operation.

So, the sequence of operations for production order 01 starts with Wood sharpening. The next and the last operation is Stool assembling.

- Schedule the operations for production order 01.

**Scheduling operations for production order 01**

Operations for production order 01 are scheduled as follows:

- Determine the following:
- The Wood sharpening equipment is assigned to the Wood sharpening operation.
- No work center type is assigned to the Stool assembling operation.

- Determine that the Wood sharpening equipment includes the Wood sharpening machine.
- Determine the following:
**Planning interval**for the Wood sharpening operation is 5 min.**Planning interval**for the Stool assembling operation is not defined.

- Determine the following:
- The Wood sharpening machine is available 9 hours a day from 8 AM to 5 PM.

Any work day is available for scheduling operations. - The company’s work schedule is 9 hours a day from 8 AM to 5 PM.

Any work day is available for scheduling operations.

- The Wood sharpening machine is available 9 hours a day from 8 AM to 5 PM.
- Determine that the production order start date is 03.07.2020.
- Calculate how many times the operations must be performed:
- For the Wood sharpening operation, consider that 2 stools are ordered. For 2 stools, 8 legs are required. The stool leg BOM says that 1 Wood sharpening operation produces 5 legs. Then this operation must be performed 2 times.
- For the Stool assembling operation, consider that 2 stools are ordered. The stool BOM says that 1 Stool assembling operation produces 1 stool. Then this operation must be performed 2 times.

- Put the Wood sharpening operation on the production schedule. Apply the following:
- The Wood sharpening machine is available on any work day.Then the operation start date is the production order start date 03.07.2020. The operation start time is the machine start time 8 AM.
- The operation
**Standard time**is 10 min. In this example, it takes 2**Planning intervals**of 5 min. - The operation must be performed 2 times. Then it takes 4
**Planning intervals**.Date

03.07.2020

Planning intervals

8:00:00

8:04:59

8:05:00

8:09:59

8:10:00

8:14:59

8:15:00

8:19:59

8:20:00

8:24:59

12

planning intervals9:25:00

9:29:59

9:30:00

9:34:59

Wood sharpening machine

PO1WS

PO1WS

PO1WS

PO1WS

where:

PO1WS - Production order 01, Wood sharpening operation

- Put the Stool assembling operation on the production schedule. Apply the following:
- Any work day is available on the company’s work schedule. Then the operation start date is the production order start date 03.07.2020.
- The previous operation ends at 8:19:59 AM. Then this operation start time is 8:20.
- A work center type is not assigned to the Stool assembling operation. Then assume that the company has unlimited capacity for performing this operation within
**Standard time**. Then it takes 1 min to perform 2 operations.Date

03.07.2020

Planning intervals

8:00:00

8:04:59

8:05:00

8:09:59

8:10:00

8:14:59

8:15:00

8:19:59

8:20:00

8:24:59

12

planning intervals9:25:00

9:29:59

9:30:00

9:34:59

Wood sharpening machine

PO1WS

PO1WS

PO1WS

PO1WS

Company

PO1SA

where:

PO1WS - Production order 01, Wood sharpening operation

PO1SA - Production order 01, Stool assembly operation

#### Production order 02

The Production order 01 for 2 stools is scheduled. Then schedule the Production order 02 for 8 stools.

The scheduling steps are the following:

- Determine the sequence of operations in the same way as for Production order 01 .
- Schedule operations for Production order 02.

**Scheduling operations for production order 02**

Operations for production order 02 are scheduled as follows:

- Determine the following:
- The Wood sharpening machine is occupied with production order 01 on 03.07.2020 up to 8:19:59. Then the machine is available from 8:20 AM to 5 PM.
- On the company’s work schedule, 03.07.2020 is available for scheduling operations from 8 AM to 5 PM.

- Determine that the production order start date is 03.07.2020.
- Calculate how many times an operation must be performed:
- For the Wood sharpening operation , consider that 8 stools are ordered. For 8 stools, 32 legs are required. The stool leg BOM says that 1 Wood sharpening operation produces 5 legs. Then this operation must be performed 7 times.
- For the Stool assembling operation, consider that 8 stools are ordered. The stool BOM says that 1 Stool assembling operation produces 1 stool. Then this operation must be performed 8 times.

- Put the Wood sharpening operation on the production schedule. Apply the following:
- The operation start time is 8:20 AM.
- The operation
**Standard time**is 10 min. In this example, it takes 2**Planning intervals**of 5 min. - The operation must be performed 7 times. Then it takes 14
**Planning intervals**.Date

03.07.2020

Planning intervals

8:00:00

8:04:59

8:05:00

8:09:59

8:10:00

8:14:59

8:15:00

8:19:59

8:20:00

8:24:59

12

planning intervals9:25:00

9:29:59

9:30:00

9:34:59

Wood sharpening machine

PO1WS

PO1WS

PO1WS

PO1WS

PO2WS

PO2WS

PO2WS

Company

PO1SA

where:

PO1WS - Production order 01, Wood sharpening operation

PO1SA - Production order 01, Stool assembly operation

PO2WS - Production order 02, Wood sharpening operation

- Put the Stool assembling operation on the production schedule. Apply the following:
- The operation start date is 03.07.2020.
- The operation start time is 9:30. For production order 02, it is the end time of the Wood sharpening operations.
- A work center type is not assigned to the Stool assembling operation. Then assume that the company has unlimited capacity for performing this operation within
**Standard time**. Then it takes 1 min to perform 7 operations.Date

03.07.2020

Planning intervals

8:00:00

8:04:59

8:05:00

8:09:59

8:10:00

8:14:59

8:15:00

8:19:59

8:20:00

8:24:59

12 planning intervals

9:25:00

9:29:59

9:30:00

9:34:59

Wood sharpening machine

PO1WS

PO1WS

PO1WS

PO1WS

PO2WS

PO2WS

PO2WS

Company

PO1SA

PO2SA

where:

PO1WS - Production order 01, Wood sharpening operation

PO1SA - Production order 01, Stool assembly operation

PO2WS - Production order 02, Wood sharpening operation

PO2SA - Production order 02, Stool assembly operation

Both production orders in the queue are scheduled.