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66 PCB007 MAGAZINE I JUNE 2020 communication with higher-level MES soft- ware. Atotech used the ISA-95 model for hier- archical control and communications (Figure 17). Factory equipment is at Level Zero, sens- ing the production process at Level One, loop control at Level Two, MOM or MES at Level Three, and ERP and other enterprise systems at Level Four. Figure 16: Fab 4.0 automation solutions, which help to visualize the filter status. The equipment communication standard used is the European OPC standards for sen- sors and devices at Level 0 and Level 1 (Fig- ure 18a). The standard for higher-level recipes, alarms, instructions, and analysis is the SEMI SECS/GEM interface standard (Figure 18b). Since Atotech is collecting so much data, the company is now working on techniques to put Figure 15: Automation training (Fab 4.0) automated solutions cleaning and exchange.