Production management for manufacturing execution systems

A method for production management for an enterprise resource planning (ERP) system and a manufacturing execution system (MES), the MES containing a production management system, a production scheduler and an event processor, the method comprises the steps of:

• a) transmitting an order from the ERP-system to the production management system, the order containing a product process, required source material, a product to be produced from the required source material and the product process, and a due date of the product;
• b) transmitting a schedule to the production scheduler, the schedule containing at least the order of step a), a description indicating which source material is taken from an inventory and when the product will be finished;
• c) transmitting a notification from the production scheduler to the event processor when a production job has to be completed;
• d) receiving information about an expected delivery of the source material via a tracking and tracing system being an electronic product code information services (EPCIS) repository, the tracking and tracing system notifying the event processor on a observation of the source material or a deviation regarding delivery of the required source material;
• e) performing, via the event processor, a situation recognition on the observation and deviation by a function which detects situations having a influence on at least one process parameter due to the deviation of the delivery of the required source material;
• f) depending on the situation recognition the event processor notifies the production scheduler regarding the source material and expected time of delivery of the source material;
• g) performing, via the production scheduler, a rescheduling of production jobs by optimizing process parameters and/or by minimizing a number of required changes in the schedule based on data notified in the step f) including a lack of the required source material;
• and performing the rescheduling step g) according to the formula:
• arg
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• min
• σ
• :
• J
• P
• →
• ⁢
• ⁢
• w
• ·
• ∑
• j
• ⁢
• ∈
• J
• ⁢
• ⁢
• P
• ⁢
• 
• σ
• ⁡
• (
• j
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• -
• j
• ·
• d
• 
• +
• (
• 1
• -
• w
• )
• ·
• edit
• (
• σ
• ,
• σ
• old
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• where:
• σ is the schedule and is represented by a total function σ:
• JP→;
• JP are the production jobs;
• is an assigned starting time for each job;
• |σ(j)−j·d| is a distance to the due date;
• wε[0, 1] is a constant representing a rescheduling threshold where w=1 means always choose an optimal schedule and w=0 leads to the schedule with minimal changes;
• σold is an old schedule;
• edit is implemented using a Hamming distance;
• and
• h) producing a product according to the rescheduling of the production scheduler and in view of available source materials.