Manufacturing execution system (MES) is a comprehensive system in which all activities in the production department are controlled. System begins with all variable customer orders, MRP system, expert scheduling and other planning resources; and creates the most effective, low-cost, suitable for the purpose, the highest quality products.
Why can’t I just create my order charts through the ERP system?
Nowadays, as the diversity is increasing, the production department is also complicated. Scheduling requires accounting records for typical levels of variation that are outside the scope of planning systems (MRP). MES considers and controls the most critical details of a typical production facility.

Reasons for variations in the production department:
• Machine failures
• Not coming to work
• Changing preparation times
• Cleaning and maintenance duration
• Changing delivery days
• Quality problems
• Alternative business plans
• Alternative parts lists
• Transportability
• Availability of quality resources
• Changes in minimum production and preparation durations

The production personnel must have the right tools and critical information, so that employees can produce the products in the most appropriate way possible. Good MESs operate on a real time basis, allowing the scheduler to control sudden changes in production. MES also delivers instant results to help you make quick decisions when it comes to late delivery, low quality, high cost. In fact, the heart of all events beats in the production department.
Closed loop integration
Another critical characteristic of Class A MESs is their ability to integrate with surrounding systems. It not only eliminates careless entry of data chunks, but also allows for the necessary arrangements to make the surrounding systems closer to reality. For example, critical information from the production department needs to be updated ERP elements such as stock, cost and supply. Preparation durations can be improved with new techniques that can be used in the production department and the ERP system needs to be fed for future use. This provides better information when the expected delivery dates of new orders are passed on to customers or improved cost information when making pricing decisions. Production information provides realistic information in order to make the necessary arrangements for continuous updating of other business systems.

Production department scheduling
High-quality MESs provide the best tools to directly control scheduling needs in the production department. The production division is a complex environment with high levels of variability. Scheduler is also critical in finding key opportunities to improve production results.

MES scheduling methods:

  • Finite scheduling
  • Queue abbreviation
  • Make production faster
  • Minimum transaction priorities
  • Finite planning

Scheduling methods:

F = Forward
R = Repetitive
B = Backward
O = Overlap
M = Manual
P = Parallel

All functions of MES
A properly resistant MES system should include the application of all critical functions in the production department. A good MES may not be completely flexible without having the key parts of the production department. At least the following functions should be implemented.
• Resource allocation and status
• Process / detail scheduling
• Production sending unit
• Document control
• Data collecting
• Work management
• Quality management
• Process management
• Exception management
• Care
• Management
• Product tracking and genealogy
• Performance analysis

Benefits of using computerized MES
A well-functioning plant can offer many meaningful offers to best-in-class manufacturers. On the other hand, manufacturers may expect significant improvements on time delivery and better production quality, mainly profitability.

Manufacturers can monitor developments from the following items:
• Reducing of production cycle time
• Reducing or eliminating data entry duration
• Reducing of processing duration
• Reducing or eliminating of paperwork between shifts
• Reducing of preparation duration
• Improving product quality
• Preventing loss of documents
• Authorization of employees
• Developing of planning processes
• Improving customer service
• Reducing of preparation costs and waiting duration
• Planning of more reliable and precise processes

The main functions of MES:
• System interface planning
• Visual scheduling
• E-production and sending
• Production department control
• Inventory monitoring and management
• Material flow management
• Exception management
• Data collecting

 Support functions of MES
• Maintenance management
• Time and service
• Payroll
• Human resources
• Work cost
• Quality
• Statistical process control
• Performance management
• Document management
• Product data management
• Genealogy and product traceability
• Product configuration
• Specification of quality and quantity of material
• Engineering change control
• Supply chain management