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Manufacturing Execution Systems (MES) are usually considered to be the second level of control above the programmable controller (PLC) or Distributed Control System (DCS). A hybrid system may do direct control as well as a MES system if direct I/O is connected to the system. However, general purpose computer systems typically do not lend themselves to this architecture. Where guaranteed timely response to real world signals is essential, a multi-tier solution is typically required.
MES systems typically perform the following functions:
Supervisory· Oversee the execution of the plan· Track conformance to plan ·control Provide a common distribution point for· Run complex quality models · correlation of events and distribution of information to multiple MES · Capture and record event and batch related information ·systems Use· Run complex setup models ·Create production and quality reports · Statistical Process Control ·process data to tune process models Provide current·Audit production results (such as FDA requirements) process data to down stream processing units (batch sizes, chemical ·compositions, batch completion times, finish batch temperatures) Provide analysis platform for the practice engineer to analyze process Execute a production plan developed by an ERP (Enterprise·data Laboratory Information· Process Scheduling ·Resource Planning) system Management Systems (LIMS)